Chapter 2 Installing and Upgrading MySQL
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Chapter 2 Installing and Upgrading MySQL

Table of Contents

This chapter describes how to obtain and install MySQL. A summary of the procedure follows and later sections provide the details. If you plan to upgrade an existing version of MySQL to a newer version rather than install MySQL for the first time, see Section 2.10.1, “Upgrading MySQL”, for information about upgrade procedures and about issues that you should consider before upgrading.

If you are interested in migrating to MySQL from another database system, see Section A.8, “MySQL 8.0 FAQ: Migration”, which contains answers to some common questions concerning migration issues.

Installation of MySQL generally follows the steps outlined here:

Determine whether MySQL runs and is supported on your platform.
Please note that not all platforms are equally suitable for running MySQL, and that not all platforms on which MySQL is known to run are officially supported by Oracle Corporation. For information about those platforms that are officially supported, see http://www.mysql.com/support/supportedplatforms/database.html on the MySQL Web site.
Choose which distribution to install.
Several versions of MySQL are available, and most are available in several distribution formats. You can choose from pre-packaged distributions containing binary (precompiled) programs or source code. When in doubt, use a binary distribution. Oracle also provides access to the MySQL source code for those who want to see recent developments and test new code. To determine which version and type of distribution you should use, see Section 2.1.1, “Which MySQL Version and Distribution to Install”.
Download the distribution that you want to install.
For instructions, see Section 2.1.2, “How to Get MySQL”. To verify the integrity of the distribution, use the instructions in Section 2.1.3, “Verifying Package Integrity Using MD5 Checksums or GnuPG”.
Install the distribution.
To install MySQL from a binary distribution, use the instructions in Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”.
To install MySQL from a source distribution or from the current development source tree, use the instructions in Section 2.8, “Installing MySQL from Source”.
Perform any necessary postinstallation setup.
After installing MySQL, see Section 2.9, “Postinstallation Setup and Testing” for information about making sure the MySQL server is working properly. Also refer to the information provided in Section 2.9.4, “Securing the Initial MySQL Account”. This section describes how to secure the initial MySQL root user account, which has no password until you assign one. The section applies whether you install MySQL using a binary or source distribution.
If you want to run the MySQL benchmark scripts, Perl support for MySQL must be available. See Section 2.11, “Perl Installation Notes”.

Instructions for installing MySQL on different platforms and environments is available on a platform by platform basis:

Unix, Linux, FreeBSD
For instructions on installing MySQL on most Linux and Unix platforms using a generic binary (for example, a .tar.gz package), see Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”.
For information on building MySQL entirely from the source code distributions or the source code repositories, see Section 2.8, “Installing MySQL from Source”
For specific platform help on installation, configuration, and building from source see the corresponding platform section:
- Linux, including notes on distribution specific methods, see Section 2.5, “Installing MySQL on Linux”.
- Solaris, including PKG and IPS formats, see Section 2.6, “Installing MySQL on Solaris”.
- IBM AIX, see Section 2.6, “Installing MySQL on Solaris”.
- FreeBSD, see Section 2.7, “Installing MySQL on FreeBSD”.
Microsoft Windows
For instructions on installing MySQL on Microsoft Windows, using either the MySQL Installer or Zipped binary, see Section 2.3, “Installing MySQL on Microsoft Windows”.
For information about managing MySQL instances, see Section 2.3.4, “MySQL Notifier”.
For details and instructions on building MySQL from source code using Microsoft Visual Studio, see Section 2.8, “Installing MySQL from Source”.
OS X
For installation on OS X, including using both the binary package and native PKG formats, see Section 2.4, “Installing MySQL on OS X”.
For information on making use of an OS X Launch Daemon to automatically start and stop MySQL, see Section 2.4.3, “Installing a MySQL Launch Daemon”.
For information on the MySQL Preference Pane, see Section 2.4.4, “Installing and Using the MySQL Preference Pane”.

2.1 General Installation Guidance

2.1.1 Which MySQL Version and Distribution to Install
2.1.2 How to Get MySQL
2.1.3 Verifying Package Integrity Using MD5 Checksums or GnuPG
2.1.4 Installation Layouts
2.1.5 Compiler-Specific Build Characteristics

The immediately following sections contain the information necessary to choose, download, and verify your distribution. The instructions in later sections of the chapter describe how to install the distribution that you choose. For binary distributions, see the instructions at Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries” or the corresponding section for your platform if available. To build MySQL from source, use the instructions in Section 2.8, “Installing MySQL from Source”.

2.1.1 Which MySQL Version and Distribution to Install

MySQL is available on many operating systems and platforms. For information about platforms supported by GA releases of MySQL, see http://www.mysql.com/support/supportedplatforms/database.html. For development versions of MySQL, builds are available for a number of platforms at http://dev.mysql.com/downloads/mysql/8.0.html. To learn more about MySQL Support, see http://www.mysql.com/support/.

When preparing to install MySQL, decide which version and distribution format (binary or source) to use.

First, decide whether to install a development release or a General Availability (GA) release. Development releases have the newest features, but are not recommended for production use. GA releases, also called production or stable releases, are meant for production use. We recommend using the most recent GA release.

The naming scheme in MySQL 8.0 uses release names that consist of three numbers and an optional suffix; for example, mysql-8.0.1-dmr. The numbers within the release name are interpreted as follows:

The first number (8) is the major version number.
The second number (0) is the minor version number. Taken together, the major and minor numbers constitute the release series number. The series number describes the stable feature set.
The third number (1) is the version number within the release series. This is incremented for each new bugfix release. In most cases, the most recent version within a series is the best choice.

Release names can also include a suffix to indicate the stability level of the release. Releases within a series progress through a set of suffixes to indicate how the stability level improves. The possible suffixes are:

dmr indicates a development milestone release (DMR). MySQL development uses a milestone model, in which each milestone introduces a small subset of thoroughly tested features. From one milestone to the next, feature interfaces may change or features may even be removed, based on feedback provided by community members who try these earily releases. Features within milestone releases may be considered to be of pre-production quality.
rc indicates a Release Candidate (RC). Release candidates are believed to be stable, having passed all of MySQL's internal testing. New features may still be introduced in RC releases, but the focus shifts to fixing bugs to stabilize features introduced earlier within the series.
Absence of a suffix indicates a General Availability (GA) or Production release. GA releases are stable, having successfully passed through the earlier release stages, and are believed to be reliable, free of serious bugs, and suitable for use in production systems.

Development within a series begins with DMR releases, followed by RC releases, and finally reaches GA status releases.

After choosing which MySQL version to install, decide which distribution format to install for your operating system. For most use cases, a binary distribution is the right choice. Binary distributions are available in native format for many platforms, such as RPM packages for Linux or DMG packages for OS X. Distributions are also available in more generic formats such as Zip archives or compressed tar files. On Windows, you can use the MySQL Installer to install a binary distribution.

Under some circumstances, it may be preferable to install MySQL from a source distribution:

You want to install MySQL at some explicit location. The standard binary distributions are ready to run at any installation location, but you might require even more flexibility to place MySQL components where you want.
You want to configure mysqld with features that might not be included in the standard binary distributions. Here is a list of the most common extra options used to ensure feature availability:
- -DWITH_LIBWRAP=1 for TCP wrappers support.
- -DWITH_ZLIB={system|bundled} for features that depend on compression
- -DWITH_DEBUG=1 for debugging support
For additional information, see Section 2.8.4, “MySQL Source-Configuration Options”.
You want to configure mysqld without some features that are included in the standard binary distributions.
You want to read or modify the C and C++ code that makes up MySQL. For this purpose, obtain a source distribution.
Source distributions contain more tests and examples than binary distributions.

2.1.2 How to Get MySQL

Check our downloads page at http://dev.mysql.com/downloads/ for information about the current version of MySQL and for downloading instructions. For a complete up-to-date list of MySQL download mirror sites, see http://dev.mysql.com/downloads/mirrors.html. You can also find information there about becoming a MySQL mirror site and how to report a bad or out-of-date mirror.

For RPM-based Linux platforms that use Yum as their package management system, MySQL can be installed using the MySQL Yum Repository. See Section 2.5.1, “Installing MySQL on Linux Using the MySQL Yum Repository” for details.

For Debian-based Linux platforms, MySQL can be installed using the MySQL APT Repository. See Section 2.5.2, “Installing MySQL on Linux Using the MySQL APT Repository” for details.

For SUSE Linux Enterprise Server (SLES) platforms, MySQL can be installed using the MySQL SLES Repository. See Section 2.5.3, “Installing MySQL on Linux Using the MySQL SLES Repository” for details.

To obtain the latest development source, see Section 2.8.3, “Installing MySQL Using a Development Source Tree”.

2.1.3 Verifying Package Integrity Using MD5 Checksums or GnuPG

2.1.3.1 Verifying the MD5 Checksum
2.1.3.2 Signature Checking Using GnuPG
2.1.3.3 Signature Checking Using Gpg4win for Windows
2.1.3.4 Signature Checking Using RPM

After downloading the MySQL package that suits your needs and before attempting to install it, make sure that it is intact and has not been tampered with. There are three means of integrity checking:

MD5 checksums
Cryptographic signatures using GnuPG, the GNU Privacy Guard
For RPM packages, the built-in RPM integrity verification mechanism

The following sections describe how to use these methods.

If you notice that the MD5 checksum or GPG signatures do not match, first try to download the respective package one more time, perhaps from another mirror site.

2.1.3.1 Verifying the MD5 Checksum

After you have downloaded a MySQL package, you should make sure that its MD5 checksum matches the one provided on the MySQL download pages. Each package has an individual checksum that you can verify against the package that you downloaded. The correct MD5 checksum is listed on the downloads page for each MySQL product, and you will compare it against the MD5 checksum of the file (product) that you download.

Each operating system and setup offers its own version of tools for checking the MD5 checksum. Typically the command is named md5sum, or it may be named md5, and some operating systems do not ship it at all. On Linux, it is part of the GNU Text Utilities package, which is available for a wide range of platforms. You can also download the source code from http://www.gnu.org/software/textutils/. If you have OpenSSL installed, you can use the command openssl md5 package_name instead. A Windows implementation of the md5 command line utility is available from http://www.fourmilab.ch/md5/. winMd5Sum is a graphical MD5 checking tool that can be obtained from http://www.nullriver.com/index/products/winmd5sum. Our Microsoft Windows examples will assume the name md5.exe.

Linux and Microsoft Windows examples:

shell> md5sum mysql-standard-8.0.4-linux-i686.tar.gz
aaab65abbec64d5e907dcd41b8699945  mysql-standard-8.0.4-linux-i686.tar.gz

shell> md5.exe mysql-installer-community-8.0.4.msi
aaab65abbec64d5e907dcd41b8699945  mysql-installer-community-8.0.4.msi

You should verify that the resulting checksum (the string of hexadecimal digits) matches the one displayed on the download page immediately below the respective package.

Note

Make sure to verify the checksum of the archive file (for example, the .zip, .tar.gz, or .msi file) and not of the files that are contained inside of the archive. In other words, verify the file before extracting its contents.

2.1.3.2 Signature Checking Using GnuPG

Another method of verifying the integrity and authenticity of a package is to use cryptographic signatures. This is more reliable than using MD5 checksums, but requires more work.

We sign MySQL downloadable packages with GnuPG (GNU Privacy Guard). GnuPG is an Open Source alternative to the well-known Pretty Good Privacy (PGP) by Phil Zimmermann. Most Linux distributions ship with GnuPG installed by default. Otherwise, see http://www.gnupg.org/ for more information about GnuPG and how to obtain and install it.

To verify the signature for a specific package, you first need to obtain a copy of our public GPG build key, which you can download from http://pgp.mit.edu/. The key that you want to obtain is named mysql-build@oss.oracle.com. Alternatively, you can copy and paste the key directly from the following text:

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.5 (GNU/Linux)

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=HfUN
-----END PGP PUBLIC KEY BLOCK-----

To import the build key into your personal public GPG keyring, use gpg --import. For example, if you have saved the key in a file named mysql_pubkey.asc, the import command looks like this:

shell> gpg --import mysql_pubkey.asc
gpg: key 5072E1F5: public key "MySQL Release Engineering
<mysql-build@oss.oracle.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1
gpg: no ultimately trusted keys found

You can also download the key from the public keyserver using the public key id, 5072E1F5:

shell> gpg --recv-keys 5072E1F5
gpg: requesting key 5072E1F5 from hkp server keys.gnupg.net
gpg: key 5072E1F5: "MySQL Release Engineering <mysql-build@oss.oracle.com>"
1 new user ID
gpg: key 5072E1F5: "MySQL Release Engineering <mysql-build@oss.oracle.com>"
53 new signatures
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg:           new user IDs: 1
gpg:         new signatures: 53

If you want to import the key into your RPM configuration to validate RPM install packages, you should be able to import the key directly:

shell> rpm --import mysql_pubkey.asc

If you experience problems or require RPM specific information, see Section 2.1.3.4, “Signature Checking Using RPM”.

After you have downloaded and imported the public build key, download your desired MySQL package and the corresponding signature, which also is available from the download page. The signature file has the same name as the distribution file with an .asc extension, as shown by the examples in the following table.

Table 2.1 MySQL Package and Signature Files for Source files

File Type	File Name
Distribution file	`mysql-standard-8.0.4-linux-i686.tar.gz`
Signature file	`mysql-standard-8.0.4-linux-i686.tar.gz.asc`

Make sure that both files are stored in the same directory and then run the following command to verify the signature for the distribution file:

shell> gpg --verify package_name.asc

If the downloaded package is valid, you will see a "Good signature" similar to:

shell> gpg --verify mysql-standard-8.0.4-linux-i686.tar.gz.asc
gpg: Signature made Tue 01 Feb 2011 02:38:30 AM CST using DSA key ID 5072E1F5
gpg: Good signature from "MySQL Release Engineering <mysql-build@oss.oracle.com>"

The Good signature message indicates that the file signature is valid, when compared to the signature listed on our site. But you might also see warnings, like so:

shell> gpg --verify mysql-standard-8.0.4-linux-i686.tar.gz.asc
gpg: Signature made Wed 23 Jan 2013 02:25:45 AM PST using DSA key ID 5072E1F5
gpg: checking the trustdb
gpg: no ultimately trusted keys found
gpg: Good signature from "MySQL Release Engineering <mysql-build@oss.oracle.com>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: A4A9 4068 76FC BD3C 4567  70C8 8C71 8D3B 5072 E1F5

That is normal, as they depend on your setup and configuration. Here are explanations for these warnings:

gpg: no ultimately trusted keys found: This means that the specific key is not "ultimately trusted" by you or your web of trust, which is okay for the purposes of verifying file signatures.
WARNING: This key is not certified with a trusted signature! There is no indication that the signature belongs to the owner.: This refers to your level of trust in your belief that you possess our real public key. This is a personal decision. Ideally, a MySQL developer would hand you the key in person, but more commonly, you downloaded it. Was the download tampered with? Probably not, but this decision is up to you. Setting up a web of trust is one method for trusting them.

See the GPG documentation for more information on how to work with public keys.

2.1.3.3 Signature Checking Using Gpg4win for Windows

The Section 2.1.3.2, “Signature Checking Using GnuPG” section describes how to verify MySQL downloads using GPG. That guide also applies to Microsoft Windows, but another option is to use a GUI tool like Gpg4win. You may use a different tool but our examples are based on Gpg4win, and utilize its bundled Kleopatra GUI.

Download and install Gpg4win, and then load Kleopatra. The dialog should look similar to:

Figure 2.1 Initial screen after loading Kleopatra

Next, add the MySQL Release Engineering certificate. Do this by clicking File, Lookup Certificates on Server. Type "Mysql Release Engineering" into the search box and press Search.

Figure 2.2 Finding the MySQL Release Engineering certificate

Select the "MySQL Release Engineering" certificate. The Fingerprint and Key-ID must be "5072E1F5", or choose Details... to confirm the certificate is valid. Now, import it by clicking Import. An import dialog will be displayed, choose Okay, and this certificate will now be listed under the Imported Certificates tab.

Next, configure the trust level for our certificate. Select our certificate, then from the main menu select Certificates, Change Owner Trust.... We suggest choosing I believe checks are very accurate for our certificate, as otherwise you might not be able to verify our signature. Select I believe checks are very accurate and then press OK.

Figure 2.3 Changing the Trust level

Next, verify the downloaded MySQL package file. This requires files for both the packaged file, and the signature. The signature file must have the same name as the packaged file but with an appended .asc extension, as shown by the example in the following table. The signature is linked to on the downloads page for each MySQL product. You must create the .asc file with this signature.

Table 2.2 MySQL Package and Signature Files for MySQL Installer for Microsoft Windows

File Type	File Name
Distribution file	`mysql-installer-community-8.0.4.msi`
Signature file	`mysql-installer-community-8.0.4.msi.asc`

Make sure that both files are stored in the same directory and then run the following command to verify the signature for the distribution file. Either drag and drop the signature (.asc) file into Kleopatra, or load the dialog from File, Decrypt/Verify Files..., and then choose either the .msi or .asc file.

Figure 2.4 The Decrypt/Verify Files dialog

Click Decrypt/Verify to check the file. The two most common results will look like the following, and although the yellow warning looks problematic, the following means that the file check passed with success. You may now run this installer.

Figure 2.5 The Decrypt/Verify Results: Good

Seeing a red "The signature is bad" error means the file is invalid. Do not execute the MSI file if you see this error.

Figure 2.6 The Decrypt/Verify Results: Bad

The Section 2.1.3.2, “Signature Checking Using GnuPG” section explains why you probably don't see a green Good signature result.

2.1.3.4 Signature Checking Using RPM

For RPM packages, there is no separate signature. RPM packages have a built-in GPG signature and MD5 checksum. You can verify a package by running the following command:

shell> rpm --checksig package_name.rpm

Example:

shell> rpm --checksig MySQL-server-8.0.4-0.linux_glibc2.5.i386.rpm
MySQL-server-8.0.4-0.linux_glibc2.5.i386.rpm: md5 gpg OK

Note

If you are using RPM 4.1 and it complains about (GPG) NOT OK (MISSING KEYS: GPG#5072e1f5), even though you have imported the MySQL public build key into your own GPG keyring, you need to import the key into the RPM keyring first. RPM 4.1 no longer uses your personal GPG keyring (or GPG itself). Rather, RPM maintains a separate keyring because it is a system-wide application and a user's GPG public keyring is a user-specific file. To import the MySQL public key into the RPM keyring, first obtain the key, then use rpm --import to import the key. For example:

shell> gpg --export -a 5072e1f5 > 5072e1f5.asc
shell> rpm --import 5072e1f5.asc

Alternatively, rpm also supports loading the key directly from a URL, and you can use this manual page:

shell> rpm --import http://dev.mysql.com/doc/refman/8.0/en/checking-gpg-signature.html

If you need to obtain the MySQL public key, see Section 2.1.3.2, “Signature Checking Using GnuPG”.

2.1.4 Installation Layouts

The installation layout differs for different installation types (for example, native packages, binary tarballs, and source tarballs), which can lead to confusion when managing different systems or using different installation sources. The individual layouts are given in the corresponding installation type or platform chapter, as described following. Note that the layout of installations from vendors other than Oracle may differ from these layouts.

2.1.5 Compiler-Specific Build Characteristics

In some cases, the compiler used to build MySQL affects the features available for use. The notes in this section apply for binary distributions provided by Oracle Corporation or that you compile yourself from source.

icc (Intel C++ Compiler) Builds

A server built with icc has these characteristics:

SSL support is not included.

2.2 Installing MySQL on Unix/Linux Using Generic Binaries

Oracle provides a set of binary distributions of MySQL. These include generic binary distributions in the form of compressed tar files (files with a .tar.gz extension) for a number of platforms, and binaries in platform-specific package formats for selected platforms.

This section covers the installation of MySQL from a compressed tar file binary distribution. For other platform-specific package formats, see the other platform-specific sections. For example, for Windows distributions, see Section 2.3, “Installing MySQL on Microsoft Windows”.

To obtain MySQL, see Section 2.1.2, “How to Get MySQL”.

MySQL compressed tar file binary distributions have names of the form mysql-VERSION-OS.tar.gz, where VERSION is a number (for example, 8.0.4), and OS indicates the type of operating system for which the distribution is intended (for example, pc-linux-i686 or winx64).

Warning

If you have previously installed MySQL using your operating system native package management system, such as yum or apt-get, you may experience problems installing using a native binary. Make sure your previous MySQL installation has been removed entirely (using your package management system), and that any additional files, such as old versions of your data files, have also been removed. You should also check for configuration files such as /etc/my.cnf or the /etc/mysql directory and delete them.

For information about replacing third-party packages with official MySQL packages, see the related Apt guide or Yum guide.

Warning

MySQL has a dependency on the libaio library. Data directory initialization and subsequent server startup steps will fail if this library is not installed locally. If necessary, install it using the appropriate package manager. For example, on Yum-based systems:

shell> yum search libaio  # search for info
shell> yum install libaio # install library

Or, on APT-based systems:

shell> apt-cache search libaio # search for info
shell> apt-get install libaio1 # install library

If you run into problems and need to file a bug report, please use the instructions in Section 1.7, “How to Report Bugs or Problems”.

On Unix, to install a compressed tar file binary distribution, unpack it at the installation location you choose (typically /usr/local/mysql). This creates the directories shown in the following table.

Table 2.3 MySQL Installation Layout for Generic Unix/Linux Binary Package

Directory	Contents of Directory
`bin`	mysqld server, client and utility programs
`data`	Log files, databases
`docs`	MySQL manual in Info format
`man`	Unix manual pages
`include`	Include (header) files
`lib`	Libraries
`share`	Miscellaneous support files, including error messages, sample configuration files, SQL for database installation

Debug versions of the mysqld binary are available as mysqld-debug. To compile your own debug version of MySQL from a source distribution, use the appropriate configuration options to enable debugging support. See Section 2.8, “Installing MySQL from Source”.

To install and use a MySQL binary distribution, the command sequence looks like this:

shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql
shell> cd /usr/local
shell> tar zxvf /path/to/mysql-VERSION-OS.tar.gz
shell> ln -s full-path-to-mysql-VERSION-OS mysql
shell> cd mysql
shell> mkdir mysql-files
shell> chmod 750 mysql-files
shell> chown -R mysql .
shell> chgrp -R mysql .
shell> bin/mysqld --initialize --user=mysql
shell> bin/mysql_ssl_rsa_setup
shell> chown -R root .
shell> chown -R mysql data mysql-files
shell> bin/mysqld_safe --user=mysql &
# Next command is optional
shell> cp support-files/mysql.server /etc/init.d/mysql.server

Note

This procedure assumes that you have root (administrator) access to your system. Alternatively, you can prefix each command using the sudo (Linux) or pfexec (Solaris) command.

The mysql-files directory provides a convenient location to use as the value of the secure_file_priv system variable that limits import/export operations to a specific directory. See Section 5.1.5, “Server System Variables”.

A more detailed version of the preceding description for installing a binary distribution follows.

Create a mysql User and Group

If your system does not already have a user and group to use for running mysqld, you may need to create one. The following commands add the mysql group and the mysql user. You might want to call the user and group something else instead of mysql. If so, substitute the appropriate name in the following instructions. The syntax for useradd and groupadd may differ slightly on different versions of Unix, or they may have different names such as adduser and addgroup.

shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql

Note

Because the user is required only for ownership purposes, not login purposes, the useradd command uses the -r and -s /bin/false options to create a user that does not have login permissions to your server host. Omit these options if your useradd does not support them.

Obtain and Unpack the Distribution

Pick the directory under which you want to unpack the distribution and change location into it. The example here unpacks the distribution under /usr/local. The instructions, therefore, assume that you have permission to create files and directories in /usr/local. If that directory is protected, you must perform the installation as root.

shell> cd /usr/local

Obtain a distribution file using the instructions in Section 2.1.2, “How to Get MySQL”. For a given release, binary distributions for all platforms are built from the same MySQL source distribution.

Unpack the distribution, which creates the installation directory. tar can uncompress and unpack the distribution if it has z option support:

shell> tar zxvf /path/to/mysql-VERSION-OS.tar.gz

The tar command creates a directory named mysql-VERSION-OS.

To install MySQL from a compressed tar file binary distribution, your system must have GNU gunzip to uncompress the distribution and a reasonable tar to unpack it. If your tar program supports the z option, it can both uncompress and unpack the file.

GNU tar is known to work. The standard tar provided with some operating systems is not able to unpack the long file names in the MySQL distribution. You should download and install GNU tar, or if available, use a preinstalled version of GNU tar. Usually this is available as gnutar, gtar, or as tar within a GNU or Free Software directory, such as /usr/sfw/bin or /usr/local/bin. GNU tar is available from http://www.gnu.org/software/tar/.

If your tar does not have z option support, use gunzip to unpack the distribution and tar to unpack it. Replace the preceding tar command with the following alternative command to uncompress and extract the distribution:

shell> gunzip < /path/to/mysql-VERSION-OS.tar.gz | tar xvf -

Next, create a symbolic link to the installation directory created by tar:

shell> ln -s full-path-to-mysql-VERSION-OS mysql

The ln command makes a symbolic link to the installation directory. This enables you to refer more easily to it as /usr/local/mysql. To avoid having to type the path name of client programs always when you are working with MySQL, you can add the /usr/local/mysql/bin directory to your PATH variable:

shell> export PATH=$PATH:/usr/local/mysql/bin

Perform Postinstallation Setup

The remainder of the installation process involves setting distribution ownership and access permissions, initializing the data directory, starting the MySQL server, and setting up the configuration file. For instructions, see Section 2.9, “Postinstallation Setup and Testing”.

2.3 Installing MySQL on Microsoft Windows

2.3.1 MySQL Installation Layout on Microsoft Windows
2.3.2 Choosing An Installation Package
2.3.3 MySQL Installer for Windows
2.3.4 MySQL Notifier
2.3.5 Installing MySQL on Microsoft Windows Using a noinstall Zip Archive
2.3.6 Troubleshooting a Microsoft Windows MySQL Server Installation
2.3.7 Windows Postinstallation Procedures
2.3.8 Upgrading MySQL on Windows

Important

MySQL Community 8.0 Server requires the Microsoft Visual C++ 2015 Redistributable Package to run on Windows platforms. Users should make sure the package has been installed on the system before installing the server. The package is available at the Microsoft Download Center.

MySQL is available for Microsoft Windows, for both 32-bit and 64-bit versions. For supported Windows platform information, see http://www.mysql.com/support/supportedplatforms/database.html.

There are different methods to install MySQL on Microsoft Windows.

MySQL Installer Method

The simplest and recommended method is to download MySQL Installer (for Windows) and let it install and configure all of the MySQL products on your system. Here is how:

Download MySQL Installer from http://dev.mysql.com/downloads/installer/ and execute it.

Note

Unlike the standard MySQL Installer, the smaller "web-community" version does not bundle any MySQL applications but it will download the MySQL products you choose to install.
Choose the appropriate Setup Type for your system. Typically you will choose Developer Default to install MySQL server and other MySQL tools related to MySQL development, helpful tools like MySQL Workbench. Or, choose the Custom setup type to manually select your desired MySQL products.

Note

Multiple versions of MySQL server can exist on a single system. You can choose one or multiple versions.
Complete the installation process by following the MySQL Installation wizard's instructions. This will install several MySQL products and start the MySQL server.

MySQL is now installed. If you configured MySQL as a service, then Windows will automatically start MySQL server every time you restart your system.

Note

You probably also installed other helpful MySQL products like MySQL Workbench and MySQL Notifier on your system. Consider loading Chapter 30, MySQL Workbench to check your new MySQL server connection, and Section 2.3.4, “MySQL Notifier” to view the connection's status. By default, these two programs automatically start after installing MySQL.

This process also installs the MySQL Installer application on your system, and later you can use MySQL Installer to upgrade or reconfigure your MySQL products.

Additional Installation Information

It is possible to run MySQL as a standard application or as a Windows service. By using a service, you can monitor and control the operation of the server through the standard Windows service management tools. For more information, see Section 2.3.5.8, “Starting MySQL as a Windows Service”.

Generally, you should install MySQL on Windows using an account that has administrator rights. Otherwise, you may encounter problems with certain operations such as editing the PATH environment variable or accessing the Service Control Manager. Once installed, MySQL does not need to be executed using a user with Administrator privileges.

For a list of limitations on the use of MySQL on the Windows platform, see Section C.10.5, “Windows Platform Limitations”.

In addition to the MySQL Server package, you may need or want additional components to use MySQL with your application or development environment. These include, but are not limited to:

To connect to the MySQL server using ODBC, you must have a Connector/ODBC driver. For more information, including installation and configuration instructions, see MySQL Connector/ODBC Developer Guide.

Note

MySQL Installer will install and configure Connector/ODBC for you.
To use MySQL server with .NET applications, you must have the Connector/Net driver. For more information, including installation and configuration instructions, see MySQL Connector/Net Developer Guide.

Note

MySQL Installer will install and configure MySQL Connector/Net for you.

MySQL distributions for Windows can be downloaded from http://dev.mysql.com/downloads/. See Section 2.1.2, “How to Get MySQL”.

MySQL for Windows is available in several distribution formats, detailed here. Generally speaking, you should use MySQL Installer. It contains more features and MySQL products than the older MSI, is simpler to use than the Zip file, and you need no additional tools to get MySQL up and running. MySQL Installer automatically installs MySQL Server and additional MySQL products, creates an options file, starts the server, and enables you to create default user accounts. For more information on choosing a package, see Section 2.3.2, “Choosing An Installation Package”.

A MySQL Installer distribution includes MySQL Server and additional MySQL products including MySQL Workbench, MySQL Notifier, and MySQL for Excel. MySQL Installer can also be used to upgrade these products in the future.
For instructions on installing MySQL using MySQL Installer, see Section 2.3.3, “MySQL Installer for Windows”.
The standard binary distribution (packaged as a Zip file) contains all of the necessary files that you unpack into your chosen location. This package contains all of the files in the full Windows MSI Installer package, but does not include an installation program.
For instructions on installing MySQL using the Zip file, see Section 2.3.5, “Installing MySQL on Microsoft Windows Using a noinstall Zip Archive”.
The source distribution format contains all the code and support files for building the executables using the Visual Studio compiler system.
For instructions on building MySQL from source on Windows, see Section 2.8, “Installing MySQL from Source”.

MySQL on Windows considerations:

Large Table Support
If you need tables with a size larger than 4GB, install MySQL on an NTFS or newer file system. Do not forget to use MAX_ROWS and AVG_ROW_LENGTH when you create tables. See Section 13.1.16, “CREATE TABLE Syntax”.
MySQL and Virus Checking Software
Virus-scanning software such as Norton/Symantec Anti-Virus on directories containing MySQL data and temporary tables can cause issues, both in terms of the performance of MySQL and the virus-scanning software misidentifying the contents of the files as containing spam. This is due to the fingerprinting mechanism used by the virus-scanning software, and the way in which MySQL rapidly updates different files, which may be identified as a potential security risk.
After installing MySQL Server, it is recommended that you disable virus scanning on the main directory (datadir) used to store your MySQL table data. There is usually a system built into the virus-scanning software to enable specific directories to be ignored.
In addition, by default, MySQL creates temporary files in the standard Windows temporary directory. To prevent the temporary files also being scanned, configure a separate temporary directory for MySQL temporary files and add this directory to the virus scanning exclusion list. To do this, add a configuration option for the tmpdir parameter to your my.ini configuration file. For more information, see Section 2.3.5.2, “Creating an Option File”.

2.3.1 MySQL Installation Layout on Microsoft Windows

For MySQL 8.0 on Windows, the default installation directory is C:\Program Files\MySQL\MySQL Server 8.0. Some Windows users prefer to install in C:\mysql, the directory that formerly was used as the default. However, the layout of the subdirectories remains the same.

All of the files are located within this parent directory, using the structure shown in the following table.

Table 2.4 Default MySQL Installation Layout for Microsoft Windows

Directory	Contents of Directory	Notes
`bin`	mysqld server, client and utility programs
`%PROGRAMDATA%\MySQL\MySQL Server 8.0\`	Log files, databases	The Windows system variable `%PROGRAMDATA%` defaults to `C:\ProgramData`
`examples`	Example programs and scripts
`include`	Include (header) files
`lib`	Libraries
`share`	Miscellaneous support files, including error messages, character set files, sample configuration files, SQL for database installation

If you install MySQL using the MySQL Installer, this package creates and sets up the data directory that the installed server will use, and also creates a pristine “template” data directory named data under the installation directory. After an installation has been performed using this package, the template data directory can be copied to set up additional MySQL instances. See Section 5.7, “Running Multiple MySQL Instances on One Machine”.

2.3.2 Choosing An Installation Package

For MySQL 8.0, there are multiple installation package formats to choose from when installing MySQL on Windows.

Note

Program Database (PDB) files (with file name extension pdb) provide information for debugging your MySQL installation in the event of a problem. These files are included in ZIP Archive distributions (but not MSI distributions) of MySQL.

MySQL Installer: This package has a file name similar to mysql-installer-community-8.0.4.0.msi or mysql-installer-commercial-8.0.4.0.msi, and utilizes MSIs to automatically install MySQL server and other products. It will download and apply updates to itself, and for each of the installed products. It also configures the additional non-server products.
The installed products are configurable, and this includes: documentation with samples and examples, connectors (such as C, C++, J, NET, and ODBC), MySQL Workbench, MySQL Notifier, MySQL for Excel, and the MySQL Server with its components.

Note

MySQL Installer does not include debugging binaries/information components (including PDB files). These are available in a separate Zip archive named mysql-VERSION-winx64-debug-test.zip for 64-bit and mysql-VERSION-win32-debug-test.zip for 32-bit.

MySQL Installer operates on all MySQL supported versions of Windows (see http://www.mysql.com/support/supportedplatforms/database.html).

Note

Because MySQL Installer is not a native component of Microsoft Windows and depends on .NET, it will not work on minimal installation options like the "Server Core" version of Windows Server 2008.

For instructions on installing MySQL using MySQL Installer, see Section 2.3.3, “MySQL Installer for Windows”.
The Noinstall Archives: These packages contain the files found in the complete installation package, with the exception of the GUI. This format does not include an automated installer, and must be manually installed and configured.

Note

The noinstall archives are split into two separate Zip files. The main package is named mysql-VERSION-winx64.zip for 64-bit and mysql-VERSION-win32.zip for 32-bit. This contains the components needed to use MySQL on your system. The optional MySQL test suite, MySQL benchmark suite, and debugging binaries/information components (including PDB files) are in a separate Zip file named mysql-VERSION-winx64-debug-test.zip for 64-bit and mysql-VERSION-win32-debug-test.zip for 32-bit.

MySQL Installer is recommended for most users.

Your choice of install package affects the installation process you must follow. If you choose to use MySQL Installer, see Section 2.3.3, “MySQL Installer for Windows”. If you choose to install a Noinstall archive, see Section 2.3.5, “Installing MySQL on Microsoft Windows Using a noinstall Zip Archive”.

2.3.3 MySQL Installer for Windows

2.3.3.1 MySQL Installer Initial Setup
2.3.3.2 Installation Workflow
2.3.3.3 MySQL Installer Product Catalog and Dashboard
2.3.3.4 MySQLInstallerConsole Reference

MySQL Installer is a standalone application designed to ease the complexity of installing and managing MySQL products that run on Microsoft Windows. It supports the following MySQL products:

MySQL Servers
A single MySQL Installer instance can install and manage multiple MySQL server versions. For example, a single MySQL Installer instance can install (and update) versions 5.6, 5.7, and 8.0 on the same host. A host cannot have both community and commercial editions of MySQL server installed.
MySQL Applications
MySQL Workbench, MySQL Shell, MySQL Router, MySQL for Visual Studio, MySQL for Excel, MySQL Notifier, and MySQL Utilities.
MySQL Connectors
MySQL Connector/Net, MySQL Connector/Python, Connector/ODBC, MySQL Connector/J, Connector/C, and Connector/C++.
Documentation and Samples
MySQL Reference Manuals (by version) in PDF format and MySQL database samples (by version).

MySQL Installer Community Edition

Download this edition from http://dev.mysql.com/downloads/installer/ to install the community version of all MySQL products for Windows. Select one of the following MySQL Installer package options:

Web: Contains MySQL Installer and configuration files only. The web package downloads only the MySQL products you select to install, but it requires an internet connection for each download. The size of this file is approximately 2 MB; the name of the file has the form mysql-installer-community-web-VERSION.N.msi where VERSION is the MySQL server version number such as 5.7 and N is the package number, which begins at 0.
Full: Bundles all of the MySQL products for Windows (including the MySQL server). The file size is over 300 MB, and its name has the form mysql-installer-community-VERSION.N.msi where VERSION is the MySQL Server version number such as 5.7 and N is the package number, which begins at 0.

MySQL Installer Commercial Edition

Download this edition from https://edelivery.oracle.com/ to install the commercial edition of all MySQL products for Windows. The Commercial Edition includes all of the products in the Community Edition and also includes the following products:

Workbench SE/EE
MySQL Enterprise Backup
MySQL Enterprise Firewall

This edition integrates with your My Oracle Support (MOS) account. For knowledge-base content and patches, see My Oracle Support.

2.3.3.1 MySQL Installer Initial Setup

When you download MySQL Installer for the first time, a setup wizard guides you through the initial installation of MySQL products. As the following figure shows, the initial setup is a one-time activity in the overall process. MySQL Installer detects existing MySQL products installed on the host during its initial setup and adds them to the list of products to be managed.

Figure 2.7 MySQL Installer Process Overview

MySQL Installer extracts configuration files (described later) to the hard drive of the host during the initial setup. Although MySQL Installer is a 32-bit application, it can install both 32-bit and 64-bit binaries.

The initial setup adds a link to the Start menu under the MySQL group. Click Start, All Programs, MySQL, MySQL Installer to open MySQL Installer.

MySQL Installer Licensing and Support Authentication

MySQL Installer requires you to accept the license agreement before it will install new MySQL packages. After you accept the terms of the agreement, you can add, update, reconfigure, and remove all of the products and features provided by the MySQL Installer edition you downloaded.

For the commercial edition, entering your My Oracle Support (MOS) credentials is optional when installing bundled MySQL products, but your credentials are required when choosing unbundled MySQL products that MySQL Installer must download. An unbundled product is any MSI file that you download using MySQL Installer after the initial setup. Your credentials must match the user name and password that you have registered with Oracle for access to the support site.

Choosing a Setup Type

During the initial setup, you are prompted to select the MySQL products to be installed on the host. One alternative is to use a predetermined setup type that matches your setup requirements. Choosing one of the following setup types determines the initial installation only and does not limit your ability to install or update MySQL products for Windows later:

Developer Default: Install the following products that compliment application development with MySQL:
- MySQL Server (Installs the version that you selected when you downloaded MySQL Installer.)
- MySQL Shell
- MySQL Router
- MySQL Workbench
- MySQL for Visual Studio
- MySQL for Excel
- MySQL Notifier
- MySQL Connectors (.NET / Python / ODBC / Java / C / C++)
- MySQL Utilities
- MySQL Documentation
- MySQL Samples and Examples
Server only: Only install the MySQL server. This setup type installs the general availability (GA) or development release server that you selected when you downloaded MySQL Installer. It uses the default installation and data paths.
Client only: Only install the most recent MySQL applications and MySQL connectors. This setup type is similar to the Developer Default type, except that it does not include MySQL server or the client programs typically bundled with the server, such as mysql or mysqladmin.
Full: Install all available MySQL products.
Custom The custom setup type enables you to filter and select individual MySQL products from the MySQL Installer catalog.
Use the Custom setup type to install:
- A product or product version that is not available from the usual download locations. The catalog contains all product releases, including the other releases between pre-release (or development) and GA.
- An instance of MySQL server using an alternative installation path, data path, or both. For instructions on how to adjust the paths, see Section 2.3.3.2.3, “Setting Alternative Server Paths”.
- Two or more MySQL server versions on the same host at the same time (for example, 5.6, 5.7, and 8.0).
- A specific combination of products and features not offered as a predetermine setup type. For example, you can install a single product, such as MySQL Workbench, instead of installing all client applications for Windows.

Path Conflicts

When the default installation or data folder (required by MySQL server) for a product to be installed already exists on the host, the wizard displays the Path Conflict step to identify each conflict and enable you to take action to avoid having files in the existing folder overwritten by the new installation. You see this step in the initial setup only when MySQL Installer detects a conflict.

To resolve the path conflict, do one of the following:

Select a product from the list to display the conflict options. A warning symbol indicates which path is in conflict. Use the browse button to choose a new path and then click Next.
Click Back to choose a different setup type or product version, if applicable. The Custom setup type enables you to select individual product versions.
Click Next to ignore the conflict and overwrite files in the existing folder.
Delete the existing product. Click Cancel to stop the initial setup and close MySQL Installer. Open MySQL Installer again from the Start menu and delete the installed product from the host using the Delete operation from the dashboard.

Check Requirements

MySQL Installer uses entries in the package-rules.xml file to determine whether the prerequisite software for each product is installed on the host. When the requirements check fails, MySQL Installer displays the Check Requirements step to help you update the host. The following figure identifies and describes the key areas of this step.

Figure 2.8 Check Requirements

MySQL Installer check-requirements screen before any requirements are downloaded and installed.

Description of Check Requirements Elements

Shows the current step in the initial setup. Steps in this list may change slightly depending on the products already installed on the host, the availability of prerequisite software, and the products to be installed on the host.
Lists all pending installation requirements by product and indicates the status as follows:
- A blank space in the Status column means that MySQL Installer can attempt to download and install the required software for you.
- The word Manual in the Status column means that you must satisfy the requirement manually. Select each product in the list to see its requirement details.
Describes the requirement in detail to assist you with each manual resolution. When possible, a download URL is provided. After you download and install the required software, click Check to verify that the requirement has been met.
Provides the following set operations to proceed:
- Back – Return to the previous step. This action enables you to select a different the setup type.
- Execute – Have MySQL Installer attempt to download and install the required software for all items without a manual status. Manual requirements are resolved by you and verified with the Check button.
- Next – Do not execute the request to apply the requirements automatically and proceed to the installation without including the products that fail the check requirements step.
- Cancel – Stop the installation of MySQL products. Because MySQL Installer is already installed, the initial setup begins again when you open MySQL Installer from the Start menu and click Add from the dashboard. For a description of the available management operations, see Product Catalog.

MySQL Installer Configuration Files

All MySQL Installer files are located within the C:\Program Files (x86) and C:\ProgramData folders. The following table describes the files and folders that define MySQL Installer as a standalone application.

Note

Installed MySQL products are neither altered nor removed when you update or uninstall MySQL Installer.

Table 2.5 MySQL Installer Configuration Files

File or Folder	Description	Folder Hierarchy
`MySQL Installer for Windows`	This folder contains all of the files needed to run MySQL Installer and MySQLInstallerConsole.exe, a command-line program with similar functionality.	`C:\Program Files (x86)`
`Templates`	The `Templates` folder has one file for each version of MySQL server. Template files contain keys and formulas to calculate some values dynamically.	`C:\ProgramData\MySQL\MySQL Installer for Windows\Manifest`
`package-rules.xml`	This file contains the prerequisites for every product to be installed.	`C:\ProgramData\MySQL\MySQL Installer for Windows\Manifest`
`produts.xml`	The `products` file (or product catalog) contains a list of all products available for download.	`C:\ProgramData\MySQL\MySQL Installer for Windows\Manifest`
`Product Cache`	The `Product Cache` folder contains all standalone MSI files bundled with the full package or downloaded afterward.	`C:\ProgramData\MySQL\MySQL Installer for Windows`

2.3.3.2 Installation Workflow

MySQL Installer provides a wizard-like tool to install and configure new MySQL products for Windows. Unlike the initial setup, which runs only once, MySQL Installer invokes the wizard each time you download or install a new product. For first-time installations, the steps of the initial setup proceed directly into the steps of the installation.

Note

Full permissions are granted to the user executing MySQL Installer to all generated files, such as my.ini. This does not apply to files and directories for specific products, such as the MySQL server data directory in %ProgramData% that is owned by SYSTEM.

Products installed and configured on a host follow a general pattern that might require your input during the various steps. MySQL Installer loads all selected products together using the following workflow:

Product download. If you installed the full (not web) MySQL Installer package, all MSI files were loaded to the Product Cache folder during the initial setup and are not downloaded again. Otherwise, the status of each product changes from Downloading to Downloaded.
Product installation. The status of each product in the list changes from Ready to Install to Installing to Complete. During the process, click Show Details to view the installation actions.
If you cancel the installation at this point, the products are installed, but the server (if installed) is not yet configured. To restart the server configuration, open MySQL Installer from the Start menu and click the Reconfigure link next to the appropriate server in the dashboard.
Product configuration. This step applies to MySQL server and samples in most cases. The status for each item in the list should indicate, Ready to Configure. Click Next to begin the step-by-step configuration of all items in the list.
The configuration options presented during this step depend on which version of the database you selected to install. After the installation completes, you can reconfigure MySQL server from the MySQL Installer dashboard.
Installation compete. This step finalizes the installation and enables you to start some applications when the installation finishes.

2.3.3.2.1 InnoDB Cluster Sandbox Test Setup

You have two options to implement a high-availability solution when you install MySQL Server 5.7.17 or higher using MySQL Installer:

Standalone MySQL Server / Classic MySQL Replication (default)
Select this option to begin the initial configuration of a standalone MySQL server. You can configure multiple servers with classic MySQL Replication manually or use MySQL Shell 1.0.9 or higher to configure a production InnoDB cluster.
For a description of the server configuration options that apply to a standalone MySQL server on Windows, see Section 2.3.3.2.2, “Server Configuration”.
InnoDB Cluster Sandbox Test Setup (for testing only)
Select this option to create and configure InnoDB cluster sandbox instances locally for testing. You can configure an InnoDB cluster sandbox to have three, five, seven, or nine MySQL server instances. Use the Reconfigure quick action in the MySQL Installer toolbar to adjust the number of instances in the InnoDB cluster after the configuration has finished.

Figure 2.9 InnoDB Cluster Sandbox Test Setup

The InnoDB cluster sandbox, named sandboxCluster by default, is available on selected ports. After the configuration executes, click the Summary tab to view the specific ports that apply to your cluster.

You can use MySQL Installer to install MySQL Shell 1.0.9, if it is not installed. MySQL Shell enables you to manage the sandbox instances. To connect with the MySQL Shell on port 3310, execute the following command:

shell> mysqlsh root@localhost:3310

MySQL Installer also provides a wizard for configuring MySQL Router to connect to the test InnoDB cluster that was created in this step. For configuration details, see MySQL Router Configuration. To learn more about MySQL Router operations, see Routing for MySQL InnoDB cluster.

2.3.3.2.2 Server Configuration

MySQL Installer handles the initial configuration of the MySQL server. For example:

It creates the configuration file (my.ini) that is used to configure the MySQL server. The values written to this file are influenced by choices you make during the installation process. Some definitions are host dependent. For example, query_cache is enabled if the host has fewer than three cores.

Note

Query cache was deprecated in MySQL 5.7 and removed in MySQL 8.0 (and later).
By default, a Windows service for the MySQL server is added.
Provides default installation and data paths for MySQL server. For instructions on how to change the default paths, see Section 2.3.3.2.3, “Setting Alternative Server Paths”.
It can optionally create MySQL server user accounts with configurable permissions based on general roles, such as DB Administrator, DB Designer, and Backup Admin. It optionally creates a Windows user named MysqlSys with limited privileges, which would then run the MySQL Server.
User accounts may also be added and configured in MySQL Workbench.
Checking Show Advanced Options allows additional Logging Options to be set. This includes defining custom file paths for the error log, general log, slow query log (including the configuration of seconds it requires to execute a query), and the binary log.

During the configuration process, click Next to proceed to the next step or Back to return to the previous step. Click Execute at the final step to apply the server configuration.

The sections that follow describe the server configuration options that apply to MySQL server on Windows. The server version you installed will determine which steps and options you can configure.

Type and Networking

Server Configuration Type
Choose the MySQL server configuration type that describes your setup. This setting defines the amount of system resources (memory) that will be assigned to your MySQL server instance.
- Development: A machine that will host many other applications, and typically this is your personal workstation. This option configures MySQL to use the least amount of memory.
- Server: Several other applications will be running on this machine, such as a web server. This option configures MySQL to use a medium amount of memory.
- Dedicated: A machine that is dedicated to running the MySQL server. Because no other major applications will run on this server, such as a web server, this option configures MySQL to use the majority of available memory.
Connectivity
Connectivity options control how the connection to MySQL is made. Options include:
- TCP/IP: You may enable TCP/IP Networking here as otherwise only local host connections are allowed. Also define the Port Number and whether to open the firewall port for network access. If the port number is in use already, you will see the information icon ( ) next to the default value and Next is disabled until you provide a new port number.
- Named Pipe: Enable and define the pipe name, similar to using the --enable-named-pipe option.
- Shared Memory: Enable and then define the memory name, similar to using the --shared-memory option.
Advanced Configuration
Check Show Advanced Options to set additional logging options in a later step. This includes defining custom file paths for the error log, general log, slow query log (including the configuration of seconds it requires to execute a query), and the binary log.
MySQL Enterprise Firewall (Commercial Edition only)
The Enable Enterprise Firewall check box is selected by default. For post-installation instructions, see MySQL Enterprise Firewall.

Accounts and Roles

Root Account Password
Assigning a root password is required and you will be asked for it when performing other MySQL Installer operations. Password strength is evaluated when you repeat the password in the box provided. For descriptive information regarding password requirements or status, move your mouse pointer over the information icon ( ) when it appears.
MySQL User Accounts
Optionally, you can create additional MySQL user accounts with predefined user roles. Each predefined role, such as DB Admin, are configured with their own set of privileges. For example, the DB Admin role has more privileges than the DB Designer role. Click the Role drop-down list for a description of each role.

Note

If the MySQL server is installed, then you must also enter the current root password.

Windows Service

On the Windows platform, MySQL server can run as a named service managed by the operating system and be configured to start up automatically when Windows starts. Alternatively, you can configure MySQL server to run as an executable program that requires manual configuration.

Configure MySQL server as a Windows service (Selected by default.)
When the default configuration option is selected, you can also select the following:
- Start the MySQL Server at System Startup
  When selected (default), the service startup type is set to Automatic; otherwise, the startup type is set to Manual.
- Run Windows Service as
  When Standard System Account is selected (default), the service logs on as Network Service.
  The Custom User option must have privileges to log on to Microsoft Windows as a service. The Next button will be disabled until this user is configured with the required privileges.
  A custom user is configured in Windows by searching for "local security policy" in the Start menu. In the Local Security Policy window, select Local Policies, User Rights Assignment, and then Log On As A Service to open the property dialog. Click Add User or Group to add the custom user and then click OK in each dialog to save the changes.
Deselect the Windows Service option

Plugins and Extensions

The Plugins and Extensions step is visible during a new installation of MySQL server version 5.7.12 (or higher) only. If you are upgrading from a previous MySQL version, then you need to open MySQL Installer again and select the Reconfigure MySQL server option.

Enable X Protocol / MySQL as a Document Store (Selected by default.)
When the X Protocol option is selected, MySQL Installer loads and starts the X Plugin. Without the X Plugin running, X Protocol clients cannot connect to the server.
- Port Number: 33060
  Requires an unused port. The default port number is 33060.
- Open Firewall port for network access
  Open by default when the X Protocol is selected.
For more information about using MySQL as a document store and the X Plugin, see Section 20.2, “Key Concepts” and Section 20.7, “X Plugin”.

Advanced Options

This step is available if the Show Advanced Configuration check box was selected during the Type and Networking step. To enable this step now, click Back to return to the Type and Networking step and select the check box.

Advanced configuration options are related to the following MySQL log files:

Apply Server Configuration

All configuration settings are applied to the MySQL server when you click Execute. Use the Configuration Steps tab to follow the progress of each action; the icon for each toggles from white to green on success. Otherwise, the process stops and displays an error message if an individual action times out. Click the Log tab to view the log.

When the installation is done and you click Finish, MySQL Installer and the installed MySQL products are added to the Microsoft Windows Start menu under the MySQL group. Opening MySQL Installer loads the dashboard where installed MySQL products are listed and other MySQL Installer operations are available.

2.3.3.2.3 Setting Alternative Server Paths

You can change the default installation path, the data path, or both when you install MySQL server. After you have installed the server, the paths cannot be altered without removing and reinstalling the server instance.

To change paths for MySQL server

Identify the MySQL server to change and display the Advanced Options link.
1. Navigate to the Select Products and Features step by doing one of the following:
  1. If this is an initial setup, select the Custom setup type and click Next.
  2. If MySQL Installer is installed already, launch it from the Start menu and then click Add from the dashboard.
2. Click Edit to filter the list of products, locate the server instance to be installed in the Available Products list.
3. With the server instance selected, use the arrow to move the selected server to the Products/Features To Be Installed list.
4. Click the server to select it. When you select the server, the Advanced Options link appears. For details, see the figure that follows.
Click Advanced Options to open a dialog window with the path-setting options. After setting the path, click Next to continue with the configuration steps.

Figure 2.10 Change MySQL Server Path

2.3.3.2.4 MySQL Applications, Connectors, and Documentation

MySQL Installer provides you with a suite of tools for developing and managing business-critical applications on Windows. The suite consist of applications, connectors, documentation, and samples.

During the initial setup, choose any predetermined setup type, except Server only, to install the latest GA version of the tools. Use the Custom setup type to install an individual tool or specific version. If MySQL Installer is installed on the host already, use the Add operation to select and install tools from the MySQL Installer dashboard.

MySQL Router Configuration

MySQL Installer provides a configuration wizard that can bootstrap an installed instance of MySQL Router 2.1.3 or later to route traffic between MySQL applications and an InnoDB cluster. When configured, MySQL Router runs as a local Windows service. For detailed information about using MySQL Router with an InnoDB cluster, see Routing for MySQL InnoDB cluster.

To configure MySQL Router, do the following:

Set up InnoDB cluster. For instructions on how to configure an InnoDB cluster sandbox on the local host using MySQL Installer, see Section 2.3.3.2.1, “InnoDB Cluster Sandbox Test Setup”. InnoDB cluster requires MySQL Server 5.7.17 or higher.
For general InnoDB cluster information, see InnoDB Cluster.
Using MySQL Installer, download and install the MySQL Router application. After the installation finishes, the configuration wizard prompts you for information. Select the Configure MySQL Router for InnoDB cluster check box to begin the configuration and provide the following configuration values:
- Hostname: localhost by default.
- Port: The port number of the primary server in the InnoDB cluster. The default is 3310.
- Management User: An administrative user with root-level privileges.
- Password: The password for the management user.
- Classic MySQL protocol connections to InnoDB cluster
  Read/Write: Set the first base port number to one that is unused (between 80 and 65532) and the wizard will select the remaining ports for you.
  The figure that follows shows an example of the MySQL Router configuration screen.
Figure 2.11 MySQL Router Configuration
Click Next and then Execute to apply the configuration. Click Finish to close MySQL Installer or return to the MySQL Installer dashboard.

2.3.3.3 MySQL Installer Product Catalog and Dashboard

This section describes the MySQL Installer product catalog and the dashboard.

Product Catalog

The product catalog stores the complete list of released MySQL products for Microsoft Windows that are available to download from MySQL. By default, and when an Internet connection is present, MySQL Installer updates the catalog daily. You can also update the catalog manually from the dashboard (described later).

An up-to-date catalog performs the following actions:

Populates the Available Products pane of the Select Products and Features step. This step appears when you select:
- The Custom setup type during the initial setup.
- The Add operation from the dashboard.
Identifies when product updates are available for the installed products listed in the dashboard.

The catalog includes all development releases (Pre-Release), general releases (Current GA), and minor releases (Other Releases). Products in the catalog will vary somewhat, depending on the MySQL Installer edition that you download.

MySQL Installer Dashboard

Figure 2.12 MySQL Installer Dashboard Elements

Description of MySQL Installer Dashboard Elements

The About MySQL button ( ) shows the current version of MySQL Installer and general information about MySQL. The version number is located above the Back button.
Always include this version number when reporting a problem with MySQL Installer.
The MySQL Installer Options button ( ) enables you to schedule daily automatic catalog updates. By default, catalog updates are scheduled at the hour when MySQL Installer was first installed. When new products or product versions are available, MySQL Installer adds them to the catalog and then displays an arrow icon ( ) next to the version number of installed products listed in the dashboard.
Use this option to enable or disable automatic catalog updates and to reset the time of day when the MySQL Installer updates the catalog automatically. For specific settings, see the task named ManifestUpdate in the Windows Task Scheduler.
MySQL Installer dashboard operations provide a variety of actions that apply to installed products or products listed in the catalog. To initiate the following operations, first click the operation link and then select the product or products to manage:
- Add: This operation opens the Select Products and Features screen. From there, you can filter the product in the product catalog, select one or more products to download (as needed), and begin the installation. For hints about using the filter, see Locating Products to Install.
- Modify: Use this operation to add or remove the features associated with installed products. Features that you can modify vary in complexity by product. When the Program Shortcut check box is selected, the product appears in the Start menu under the MySQL group.
- Upgrade: This operation loads the Select Products to Upgrade screen and populates it with all the upgrade candidates. An installed product can have more than one upgrade version and requires a current product catalog.
  To choose a new product version:
  1. Confirm that the check box next to product name in the Upgradeable Products pane has a check mark. Deselect the products that you do not intend to upgrade at this time.
  2. Click a product in the list to highlight it. This action populates the Upgradeable Versions pane with the details of each available version for the selected product: version number, published date, and a Changes link to open the release notes for that version.
  MySQL Installer upgrades all of the selected products in one action. Click Show Details to view the actions performed by MySQL Installer.
- Remove This operation opens the Remove Products screen and populates it with the MySQL products installed on the host. Select the MySQL products you want to remove (uninstall) and then click Execute to begin the removal process.
  To select products to remove, do one of the following:
  - Select the check box for one or more products.
  - Select the Product check box to select all products.
The Reconfigure link in the Quick Action column next to each installed server loads the current configuration values for the server and then cycles through all configuration steps enabling you to change the options and values. On completion, MySQL Installer stops the server, applies the configuration changes, and restarts the server for you. For a description of each configuration option, see Section 2.3.3.2.2, “Server Configuration”.
Installed Samples and Examples associated with a specific MySQL server version can be also be reconfigured to apply feature-configuration changes, if any. You must provide credentials with root privileges to reconfigure these items.
The Catalog link enables you to download the latest catalog of MySQL products manually and then to integrate those product changes with MySQL Installer. The catalog-download action does not perform an upgrade of the products already installed on the host. Instead, it returns to the dashboard and displays an arrow icon in the Version column for each installed product that has a newer version. Use the Upgrade operation to install the newer product version.
You can also use the Catalog link to display the current change history of each product without downloading the new catalog. Select the Do not update at this time check box to view the change history only.

Locating Products to Install

MySQL products in the catalog are listed by category: MySQL Servers, Applications, MySQL Connectors, and Documentation. Only the latest GA versions appear in the Available Products pane by default. If you are looking for a pre-GA or older version of a product, it may not be visible in the default list.

To change the filter that displays available products in the Select Products and Features screen, click Edit.

Figure 2.13 Filter Available Products

Edit the filter to display MySQL products.

Reset the following values to filter the list of available products:

Text: Filter by text.
Category: All Software (default), MySQL Servers, Applications, MySQL Connectors, or Documentation (for samples and documentation).
Age: Pre-Release, Current GA (default), or Other Releases.
Already Downloaded (the check box is deselected by default).
Architecture: Any (default), 32-bit, or 64-bit.

2.3.3.4 MySQLInstallerConsole Reference

MySQLInstallerConsole.exe provides command-line functionality that is similar to MySQL Installer. It is installed when MySQL Installer is initially executed and then available within the MySQL Installer directory. Typically, that is in C:\Program Files (x86)\MySQL\MySQL Installer\, and the console must be executed with administrative privileges.

To use, invoke the command prompt with administrative privileges by choosing Start, Accessories, then right-click on Command Prompt and choose Run as administrator. And from the command line, optionally change the directory to where MySQLInstallerConsole.exe is located:

C:\> cd Program Files (x86)\MySQL\MySQL Installer for Windows
C:\Program Files (x86)\MySQL\MySQL Installer for Windows> MySQLInstallerConsole.exe help
=================== Start Initialization ===================
MySQL Installer is running in Community mode

Attempting to update manifest.
Initializing product requirements
Loading product catalog
Checking for product catalog snippets
Checking for product packages in the bundle
Categorizing product catalog
Finding all installed packages.
Your product catalog was last updated at 11/1/2016 4:10:38 PM
=================== End Initialization ===================

The following commands are available:

Configure - Configures one or more of your installed programs.
Help      - Provides list of available commands.
Install   - Install and configure one or more available MySQL programs.
List      - Provides an interactive way to list all products available.
Modify    - Modifies the features of installed products.
Remove    - Removes one or more products from your system.
Status    - Shows the status of all installed products.
Update    - Update the current product catalog.
Upgrade   - Upgrades one or more of your installed programs.

MySQLInstallerConsole.exe supports the following options, which are specified on the command line:

Note

Configuration block values that contain a colon (":") must be wrapped in double quotes. For example, installdir="C:\MySQL\MySQL Server 8.0".

configure [product1]:[setting]=[value]; [product2]:[setting]=[value]; [...]
Configure one or more MySQL products on your system. Multiple setting=value pairs can be configured for each product.
Switches include:
- -showsettings : Displays the available options for the selected product, by passing in the product name after -showsettings.
- -silent : Disable confirmation prompts.
```
C:\> MySQLInstallerConsole configure -showsettings server
C:\> MySQLInstallerConsole configure server:port=3307
```
help [command]
Displays a help message with usage examples, and then exits. Pass in an additional command to receive help specific to that command.
```
C:\> MySQLInstallerConsole help
C:\> MySQLInstallerConsole help install
```
install [product]:[features]:[config block]:[config block]:[config block]; [...]
Install one or more MySQL products on your system.
Switches and syntax options include:
- -type=[SetupType] : Installs a predefined set of software. The "SetupType" can be one of the following:
  
  Note
  
  Non-custom setup types can only be chosen if no other MySQL products are installed.
  - Developer: Installs a complete development environment.
  - Server: Installs a single MySQL server
  - Client: Installs client programs and libraries
  - Full: Installs everything
  - Custom: Installs user selected products. This is the default option.
- -showsettings : Displays the available options for the selected product, by passing in the product name after -showsettings.
- -silent : Disable confirmation prompts.
- [config block]: One or more configuration blocks can be specified. Each configuration block is a semicolon separated list of key value pairs. A block can include either a "config" or "user" type key, where "config" is the default type if one is not defined.
  Configuration block values that contain a colon (":") must be wrapped in double quotes. For example, installdir="C:\MySQL\MySQL Server 8.0".
  Only one "config" type block can be defined per product. A "user" block should be defined for each user that should be created during the product's installation.
  
  Note
  
  Adding users is not supported when a product is being reconfigured.
- [feature]: The feature block is a semicolon separated list of features, or '*' to select all features.
```
C:\> MySQLInstallerConsole install server;5.6.25:*:port=3307;serverid=2:type=user;username=foo;password=bar;role=DBManager
C:\> MySQLInstallerConsole install server;5.6.25;x64 -silent
```
An example that passes in additional configuration blocks, broken up by ^ to fit this screen:
```
C:\> MySQLInstallerConsole install server;5.6.25;x64:*:type=config;openfirewall=true; ^
          generallog=true;binlog=true;serverid=3306;enable_tcpip=true;port=3306;rootpasswd=pass; ^
          installdir="C:\MySQL\MySQL Server 5.6":type=user;datadir="C:\MySQL\data";username=foo;password=bar;role=DBManager
```
list
Lists an interactive console where all of the available MySQL products can be searched. Execute MySQLInstallerConsole list to launch the console, and enter in a substring to search.
```
C:\> MySQLInstallerConsole list
```
modify [product1:-removelist|+addlist] [product2:-removelist|+addlist] [...]
Modifies or displays features of a previously installed MySQL product.
- -silent : Disable confirmation prompts.
```
C:\> MySQLInstallerConsole modify server
C:\> MySQLInstallerConsole modify server:+documentation
C:\> MySQLInstallerConsole modify server:-debug
```
remove [product1] [product2] [...]
Removes one ore more products from your system.
- * : Pass in * to remove all of the MySQL products.
- -continue : Continue the operation even if an error occurs.
- -silent : Disable confirmation prompts.
```
C:\> MySQLInstallerConsole remove *
C:\> MySQLInstallerConsole remove server
```
status
Provides a quick overview of the MySQL products that are installed on the system. Information includes product name and version, architecture, date installed, and install location.
```
C:\> MySQLInstallerConsole status
```
update
Downloads the latest MySQL product catalog to your system. On success, the download catalog will be applied the next time either MySQLInstaller or MySQLInstallerConsole is executed.
```
C:\> MySQLInstallerConsole update
```
Note

The Automatic Catalog Update GUI option executes this command from the Windows Task Scheduler.
upgrade [product1:version] [product2:version] [...]
Upgrades one or more products on your system. Syntax options include:
- * : Pass in * to upgrade all products to the latest version, or pass in specific products.
- ! : Pass in ! as a version number to upgrade the MySQL product to its latest version.
- -silent : Disable confirmation prompts.
```
C:\> MySQLInstallerConsole upgrade *
C:\> MySQLInstallerConsole upgrade workbench:6.3.5
C:\> MySQLInstallerConsole upgrade workbench:!
C:\> MySQLInstallerConsole upgrade workbench:6.3.5 excel:1.3.2
```

2.3.4 MySQL Notifier

2.3.4.1 MySQL Notifier Usage
2.3.4.2 Setting Up Remote Monitoring in MySQL Notifier

MySQL Notifier is a tool that enables you to monitor and adjust the status of your local and remote MySQL server instances through an indicator that resides in the system tray. MySQL Notifier also gives quick access to MySQL Workbench through its context menu.

The MySQL Notifier is installed by MySQL Installer, and (by default) will start-up when Microsoft Windows is started.

To install, download and execute the MySQL Installer, be sure the MySQL Notifier product is selected, then proceed with the installation. See the MySQL Installer manual for additional details.

For notes detailing the changes in each release of MySQL Notifier, see the MySQL Notifier Release Notes.

Visit the MySQL Notifier forum for additional MySQL Notifier help and support.

Features include:

Start, Stop, and Restart instances of the MySQL Server.
Automatically detects (and adds) new MySQL Server services. These are listed under Manage Monitored Items, and may also be configured.
The Tray icon changes, depending on the status. It's green if all monitored MySQL Server instances are running, or red if at least one service is stopped. The Update MySQL Notifier tray icon based on service status option, which dictates this behavior, is enabled by default for each service.
Links to other applications like MySQL Workbench, MySQL Installer, and the MySQL Utilities. For example, choosing Manage Instance will load the MySQL Workbench Server Administration window for that particular instance.
If MySQL Workbench is also installed, then the Manage Instance and SQL Editor options are available for local (but not remote) MySQL instances.
Monitors both local and remote MySQL instances.

2.3.4.1 MySQL Notifier Usage

MySQL Notifier resides in the system tray and provides visual status information for your MySQL server instances. A green icon is displayed at the top left corner of the tray icon if the current MySQL server is running, or a red icon if the service is stopped.

MySQL Notifier automatically adds discovered MySQL services on the local machine, and each service is saved and configurable. By default, the Automatically add new services whose name contains option is enabled and set to mysql. Related Notifications Options include being notified when new services are either discovered or experience status changes, and are also enabled by default. And uninstalling a service will also remove the service from MySQL Notifier.

Clicking the system tray icon will reveal several options, as the follow figures show:

The Service Instance menu is the main MySQL Notifier window, and enables you to Stop, Start, and Restart the MySQL server.

Figure 2.14 MySQL Notifier Service Instance menu

The Actions menu includes several links to external applications (if they are installed), and a Refresh Status option to manually refresh the status of all monitored services (in both local and remote computers) and MySQL instances.

Note

The main menu will not show the Actions menu when there are no services being monitored by MySQL Notifier.

Figure 2.15 MySQL Notifier Actions menu

The Actions, Options menu configures MySQL Notifier and includes options to:

Use colorful status icons: Enables a colorful style of icons for the tray of MySQL Notifier.
Run at Windows Startup: Allows the application to be loaded when Microsoft Windows starts.
Automatically Check For Updates Every # Weeks: Checks for a new version of MySQL Notifier, and runs this check every # weeks.
Automatically add new services whose name contains: The text used to filter services and add them automatically to the monitored list of the local computer running MySQL Notifier, and on remote computers already monitoring Windows services.
Ping monitored MySQL Server instances every # seconds: The interval (in seconds) to ping monitored MySQL Server instances for status changes. Longer intervals might be necessary if the list of monitored remote instances is large.
Notify me when a service is automatically added: Will display a balloon notification from the taskbar when a newly discovered service is added to the monitored services list.
Notify me when a service changes status: Will display a balloon notification from the taskbar when a monitored service changes its status.
Automatic connections migration delayed until: When there are connections to migrate, postpone the migration by one hour, one day, one week, one month, or indefinitely.

Figure 2.16 MySQL Notifier Options menu

The Actions, Manage Monitored Items menu enables you to configure the monitored services and MySQL instances. First, with the Services tab open:

Figure 2.17 MySQL Notifier Manage Services menu

The Instances tab is similar:

Figure 2.18 MySQL Notifier Manage Instances menu

Adding a service or instance (after clicking Add in the Manage Monitored Items window) enables you to select a running Microsoft Windows service or instance connection, and configure MySQL Notifier to monitor it. Add a new service or instance by clicking service name from the list, then OK to accept. Multiple services and instances may be selected.

Figure 2.19 MySQL Notifier Adding new services

Add instances:

Figure 2.20 MySQL Notifier Adding new instances

Troubleshooting

For issues that are not documented here, visit the MySQL Notifier Support Forum for MySQL Notifier help and support.

Problem: attempting to start/stop/restart a MySQL service might generate an error similar to "The Service MySQLVERSION failed the most recent status change request with the message "The service mysqlVERSION was not found in the Windows Services".
Explanation: this is a case-sensitivity issue, in that the service name is MySQLVERSION compared to having mysqlVERSION in the configuration file.
Solution: either update your MySQL Notifier configuration file with the correct information, or stop MySQL Notifier and delete this configuration file. The MySQL Notifier configuration file is located at %APPDATA%\Oracle\MySQL Notifier\settings.config where %APPDATA% is a variable and depends on your system. A typical location is "C:\Users\YourUsername\AppData\Running\Oracle\MySQL Notifier\settings.config" where YourUsername is your system's user name. In this file, and within the ServerList section, change the ServerName values from lowercase to the actual service names. For example, change mysqlVERSION to MySQLVERSION, save, and then restart MySQL Notifier. Alternatively, stop MySQL Notifier, delete this file, then restart MySQL Notifier.
Problem: when connecting to a remote computer for the purpose of monitoring a remote Windows service, the Add Service dialog does not always show all the services shown in the Windows Services console.
Explanation: this behavior is governed by the operating system and the outcome is expected when working with nondomain user accounts. For a complete description of the behavior, see the User Account Control and WMI article from Microsoft.
Solution: when the remote computer is in a compatible domain, it is recommended that domain user accounts are used to connect through WMI to a remote computer. For detailed setup instructions using WMI, see Section 2.3.4.2, “Setting Up Remote Monitoring in MySQL Notifier”.
Alternatively, when domain user accounts are not available, Microsoft provides a less secure workaround that should only be implemented with caution. For more information, see the Description of User Account Control and remote restrictions in Windows Vista KB article from Microsoft.

2.3.4.2 Setting Up Remote Monitoring in MySQL Notifier

MySQL Notifier uses Windows Management Instrumentation (WMI) to manage and monitor services on remote computers. This section explains how it works and how to set up your system to monitor remote MySQL instances.

In order to configure WMI, it is important to understand that the underlying Distributed Component Object Model (DCOM) architecture is doing the WMI work. Specifically, MySQL Notifier is using asynchronous notification queries on remote Microsoft Windows hosts as .NET events. These events send an asynchronous callback to the computer running MySQL Notifier so it knows when a service status has changed on the remote computer. Asynchronous notifications offer the best performance compared to semisynchronous notifications or synchronous notifications that use timers.

Asynchronous notification requires the remote computer to send a callback to the client computer (thus opening a reverse connection), so the Windows Firewall and DCOM settings must be properly configured for the communication to function properly.

Figure 2.21 MySQL Notifier Distributed Component Object Model (DCOM)

Most of the common errors thrown by asynchronous WMI notifications are related to Windows Firewall blocking the communication, or to DCOM / WMI settings not being set up properly. For a list of common errors with solutions, see Common Errors.

The following steps are required to make WMI function. These steps are divided between two machines. A single host computer that runs MySQL Notifier (Computer A), and multiple remote machines that are being monitored (Computer B).

Computer running MySQL Notifier (Computer A)

Enable remote administration by either editing the Group Policy Editor, or using NETSH:
Using the Group Policy Editor:
1. Click Start, click Run, type GPEDIT.MSC, and then click OK.
2. Under the Local Computer Policy heading, expand Computer Configuration.
3. Expand Administrative Templates, then Network, Network Connections, and then Windows Firewall.
4. If the computer is in the domain, then double-click Domain Profile; otherwise, double-click Standard Profile.
5. Double-click Windows Firewall: Allow inbound remote administration exception to open a configuration window.
6. Check the Enabled option button and then click OK.
Using the NETSH command:

Note

The "netsh firewall" command is deprecated as of Microsoft Server 2008 and Vista, and replaced with "netsh advfirewall firewall".
1. Open a command prompt window with Administrative rights (you can right-click the Command Prompt icon and select Run as Administrator).
2. Execute the following command:
```
NETSH advfirewall firewall set service RemoteAdmin enable
```
Open the DCOM port TCP 135:
1. Open a command prompt window with Administrative rights (you can right-click the Command Prompt icon and select Run as Administrator).
2. Execute the following command:
```
NETSH advfirewall firewall add rule name=DCOM_TCP135 protocol=TCP localport=135 dir=in action=allow
```
Add the client application that contains the sink for the callback (MySqlNotifier.exe) to the Windows Firewall Exceptions List (use either the Windows Firewall configuration or NETSH):
Using the Windows Firewall configuration:
1. In the Control Panel, double-click Windows Firewall.
2. In the Windows Firewall window's left panel, click Allow a program or feature through Windows Firewall.
3. In the Allowed Programs window, click Change Settings and do one of the following:
  - If MySqlNotifier.exe is in the Allowed programs and features list, make sure it is checked for the type of networks the computer connects to (Private, Public or both).
  - If MySqlNotifier.exe is not in the list, click Allow another program....
    
    In the Add a Program window, select the MySqlNotifier.exe if it exists in the Programs list, otherwise click Browse... and go to the directory where MySqlNotifier.exe was installed to select it, then click Add.
    Make sure MySqlNotifier.exe is checked for the type of networks the computer connects to (Private, Public or both).
Using the NETSH command:
1. Open a command prompt window with Administrative rights (you can right-click the Command Prompt icon and click Run as Administrator).
2. Execute the following command, where you change "[YOUR_INSTALL_DIRECTORY]":
```
NETSH advfirewall firewall add rule name=MySqlNotifier program=[YOUR_INSTALL_DIRECTORY]\MySqlNotifier.exe action=allow dir=in
```
If Computer B is either a member of WORKGROUP or is in a different domain that is untrusted by Computer A, then the callback connection (Connection 2) is created as an Anonymous connection. To grant Anonymous connections DCOM Remote Access permissions:
1. Click Start, click Run, type DCOMCNFG, and then click OK.
2. In the Component Services dialog box, expand Component Services, expand Computers, and then right-click My Computer and click Properties.
3. In the My Computer Properties dialog box, click the COM Security tab.
4. Under Access Permissions, click Edit Limits.
5. In the Access Permission dialog box, select ANONYMOUS LOGON name in the Group or user names box. In the Allow column under Permissions for User, select Remote Access, and then click OK.

Monitored Remote Computer (Computer B)

If the user account that is logged on to the computer running the MySQL Notifier (Computer A) is a local administrator on the remote computer (Computer B), such that the same account is an administrator on Computer B, you can skip to the "Allow for remote administration" step.

Setting DCOM security to allow a non-administrator user to access a computer remotely:

Grant "DCOM remote launch" and activation permissions for a user or group:
1. Click Start, click Run, type DCOMCNFG, and then click OK.
2. In the Component Services dialog box, expand Component Services, expand Computers, and then right-click My Computer and click Properties.
3. In the My Computer Properties dialog box, click the COM Security tab.
4. Under Launch and Activation Permission, click Edit Limits.
5. In the Launch and Activation Permission dialog box, follow these steps if your name or your group does not appear in the Groups or user names list:
  1. In the Launch and Activation Permission dialog box, click Add.
  2. In the Select Users or Groups dialog box, add your name and the group in the Enter the object names to select box, and then click OK.
6. In the Launch and Activation Permission dialog box, select your user and group in the Group or user names box. In the Allow column under Permissions for User, select Remote Launch, select Remote Activation, and then click OK.
Grant DCOM remote access permissions:
1. Click Start, click Run, type DCOMCNFG, and then click OK.
2. In the Component Services dialog box, expand Component Services, expand Computers, and then right-click My Computer and click Properties.
3. In the My Computer Properties dialog box, click the COM Security tab.
4. Under Access Permissions, click Edit Limits.
5. In the Access Permission dialog box, select ANONYMOUS LOGON name in the Group or user names box. In the Allow column under Permissions for User, select Remote Access, and then click OK.
Allowing non-administrator users access to a specific WMI namespace:
1. In the Control Panel, double-click Administrative Tools.
2. In the Administrative Tools window, double-click Computer Management.
3. In the Computer Management window, expand the Services and Applications tree.
4. Right-click the WMI Control icon and select Properties.
5. In the WMI Control Properties window, click the Security tab.
6. In the Security tab, select the namespace and click Security. Root/CIMV2 is a commonly used namespace.
7. Locate the appropriate account and check Remote Enable in the Permissions list.
Allow for remote administration by either editing the Group Policy Editor or using NETSH:
Using the Group Policy Editor:
1. Click Start, click Run, type GPEDIT.MSC, and then click OK.
2. Under the Local Computer Policy heading, double-click Computer Configuration.
3. Double-click Administrative Templates, then Network, Network Connections, and then Windows Firewall.
4. If the computer is in the domain, then double-click Domain Profile; otherwise, double-click Standard Profile.
5. Click Windows Firewall: Allow inbound remote administration exception.
6. On the Action menu either select Edit, or double-click the selection from the previous step.
7. Check the Enabled radio button, and then click OK.
Using the NETSH command:
1. Open a command prompt window with Administrative rights (you can right-click the Command Prompt icon and click Run as Administrator).
2. Execute the following command:
```
NETSH advfirewall firewall set service RemoteAdmin enable
```
Confirm that the user account you are logging in with uses the Name value and not the Full Name value:
1. In the Control Panel, double-click Administrative Tools.
2. In the Administrative Tools window, double-click Computer Management.
3. In the Computer Management window, expand the System Tools then Local Users and Groups.
4. Click the Users node, and on the right side panel locate your user and make sure it uses the Name value to connect, and not the Full Name value.

Common Errors

0x80070005
- DCOM Security was not configured properly (see Computer B, the Setting DCOM security... step).
- The remote computer (Computer B) is a member of WORKGROUP or is in a domain that is untrusted by the client computer (Computer A) (see Computer A, the Grant Anonymous connections DCOM Remote Access permissions step).
0x8007000E
- The remote computer (Computer B) is a member of WORKGROUP or is in a domain that is untrusted by the client computer (Computer A) (see Computer A, the Grant Anonymous connections DCOM Remote Access permissions step).
0x80041003
- Access to the remote WMI namespace was not configured properly (see Computer B, the Allowing non-administrator users access to a specific WMI namespace step).
0x800706BA
- The DCOM port is not open on the client computers (Computer A) firewall. See the Open the DCOM port TCP 135 step for Computer A.
- The remote computer (Computer B) is inaccessible because its network location is set to Public. Make sure you can access it through the Windows Explorer.

2.3.5 Installing MySQL on Microsoft Windows Using a noinstall Zip Archive

2.3.5.1 Extracting the Install Archive
2.3.5.2 Creating an Option File
2.3.5.3 Selecting a MySQL Server Type
2.3.5.4 Initializing the Data Directory
2.3.5.5 Starting the Server for the First Time
2.3.5.6 Starting MySQL from the Windows Command Line
2.3.5.7 Customizing the PATH for MySQL Tools
2.3.5.8 Starting MySQL as a Windows Service
2.3.5.9 Testing The MySQL Installation

Users who are installing from the noinstall package can use the instructions in this section to manually install MySQL. The process for installing MySQL from a Zip archive is as follows:

Extract the main archive to the desired install directory
Optional: also extract the debug-test archive if you plan to execute the MySQL benchmark and test suite
Create an option file
Choose a MySQL server type
Initialize MySQL
Start the MySQL server
Secure the default user accounts

This process is described in the sections that follow.

2.3.5.1 Extracting the Install Archive

To install MySQL manually, do the following:

If you are upgrading from a previous version please refer to Section 2.3.8, “Upgrading MySQL on Windows”, before beginning the upgrade process.
Make sure that you are logged in as a user with administrator privileges.
Choose an installation location. Traditionally, the MySQL server is installed in C:\mysql. The MySQL Installation Wizard installs MySQL under C:\Program Files\MySQL. If you do not install MySQL at C:\mysql, you must specify the path to the install directory during startup or in an option file. See Section 2.3.5.2, “Creating an Option File”.

Note

The MySQL Installer installs MySQL under C:\Program Files\MySQL.
Extract the install archive to the chosen installation location using your preferred Zip archive tool. Some tools may extract the archive to a folder within your chosen installation location. If this occurs, you can move the contents of the subfolder into the chosen installation location.

2.3.5.2 Creating an Option File

If you need to specify startup options when you run the server, you can indicate them on the command line or place them in an option file. For options that are used every time the server starts, you may find it most convenient to use an option file to specify your MySQL configuration. This is particularly true under the following circumstances:

The installation or data directory locations are different from the default locations (C:\Program Files\MySQL\MySQL Server 8.0 and C:\Program Files\MySQL\MySQL Server 8.0\data).
You need to tune the server settings, such as memory, cache, or InnoDB configuration information.

When the MySQL server starts on Windows, it looks for option files in several locations, such as the Windows directory, C:\, and the MySQL installation directory (for the full list of locations, see Section 4.2.6, “Using Option Files”). The Windows directory typically is named something like C:\WINDOWS. You can determine its exact location from the value of the WINDIR environment variable using the following command:

C:\> echo %WINDIR%

MySQL looks for options in each location first in the my.ini file, and then in the my.cnf file. However, to avoid confusion, it is best if you use only one file. If your PC uses a boot loader where C: is not the boot drive, your only option is to use the my.ini file. Whichever option file you use, it must be a plain text file.

Note

When using the MySQL Installer to install MySQL Server, it will create the my.ini at the default location, and the user executing MySQL Installer is granted full permissions to this new my.ini file.

In other words, be sure that the MySQL Server user has permission to read the my.ini file.

You can also make use of the example option files included with your MySQL distribution; see Section 5.1.2, “Server Configuration Defaults”.

An option file can be created and modified with any text editor, such as Notepad. For example, if MySQL is installed in E:\mysql and the data directory is in E:\mydata\data, you can create an option file containing a [mysqld] section to specify values for the basedir and datadir options:

[mysqld]
# set basedir to your installation path
basedir=E:/mysql
# set datadir to the location of your data directory
datadir=E:/mydata/data

Microsoft Windows path names are specified in option files using (forward) slashes rather than backslashes. If you do use backslashes, double them:

[mysqld]
# set basedir to your installation path
basedir=E:\\mysql
# set datadir to the location of your data directory
datadir=E:\\mydata\\data

The rules for use of backslash in option file values are given in Section 4.2.6, “Using Option Files”.

The Zip Archive does not include a data directory. To initialize a MySQL installation by creating the data directory and populating the tables in the mysql system database, initialize MySQL using either --initialize or --initialize-insecure. For additional information, see Section 2.9.1.1, “Initializing the Data Directory Manually Using mysqld”.

If you would like to use a data directory in a different location, you should copy the entire contents of the data directory to the new location. For example, if you want to use E:\mydata as the data directory instead, you must do two things:

Move the entire data directory and all of its contents from the default location (for example C:\Program Files\MySQL\MySQL Server 8.0\data) to E:\mydata.
Use a --datadir option to specify the new data directory location each time you start the server.

2.3.5.3 Selecting a MySQL Server Type

The following table shows the available servers for Windows in MySQL 8.0.

Binary	Description
mysqld	Optimized binary with named-pipe support
mysqld-debug	Like mysqld, but compiled with full debugging and automatic memory allocation checking

All of the preceding binaries are optimized for modern Intel processors, but should work on any Intel i386-class or higher processor.

Each of the servers in a distribution support the same set of storage engines. The SHOW ENGINES statement displays which engines a given server supports.

All Windows MySQL 8.0 servers have support for symbolic linking of database directories.

MySQL supports TCP/IP on all Windows platforms. MySQL servers on Windows also support named pipes, if you start the server with the --enable-named-pipe option. It is necessary to use this option explicitly because some users have experienced problems with shutting down the MySQL server when named pipes were used. The default is to use TCP/IP regardless of platform because named pipes are slower than TCP/IP in many Windows configurations.

2.3.5.4 Initializing the Data Directory

If you installed MySQL using the Noinstall package, no data directory is included. To initialize the data directory, use the instructions at Section 2.9.1.1, “Initializing the Data Directory Manually Using mysqld”.

2.3.5.5 Starting the Server for the First Time

This section gives a general overview of starting the MySQL server. The following sections provide more specific information for starting the MySQL server from the command line or as a Windows service.

The information here applies primarily if you installed MySQL using the Noinstall version, or if you wish to configure and test MySQL manually rather than with the GUI tools.

Note

The MySQL server will automatically start after using MySQL Installer, and MySQL Notifier can be used to start/stop/restart at any time.

The examples in these sections assume that MySQL is installed under the default location of C:\Program Files\MySQL\MySQL Server 8.0. Adjust the path names shown in the examples if you have MySQL installed in a different location.

Clients have two options. They can use TCP/IP, or they can use a named pipe if the server supports named-pipe connections.

MySQL for Windows also supports shared-memory connections if the server is started with the --shared-memory option. Clients can connect through shared memory by using the --protocol=MEMORY option.

For information about which server binary to run, see Section 2.3.5.3, “Selecting a MySQL Server Type”.

Testing is best done from a command prompt in a console window (or “DOS window”). In this way you can have the server display status messages in the window where they are easy to see. If something is wrong with your configuration, these messages make it easier for you to identify and fix any problems.

Note

The database must be initialized before MySQL can be started. For additional information about the initialization process, see Section 2.9.1.1, “Initializing the Data Directory Manually Using mysqld”.

To start the server, enter this command:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld" --console

For a server that includes InnoDB support, you should see the messages similar to those following as it starts (the path names and sizes may differ):

InnoDB: The first specified datafile c:\ibdata\ibdata1 did not exist:
InnoDB: a new database to be created!
InnoDB: Setting file c:\ibdata\ibdata1 size to 209715200
InnoDB: Database physically writes the file full: wait...
InnoDB: Log file c:\iblogs\ib_logfile0 did not exist: new to be created
InnoDB: Setting log file c:\iblogs\ib_logfile0 size to 31457280
InnoDB: Log file c:\iblogs\ib_logfile1 did not exist: new to be created
InnoDB: Setting log file c:\iblogs\ib_logfile1 size to 31457280
InnoDB: Log file c:\iblogs\ib_logfile2 did not exist: new to be created
InnoDB: Setting log file c:\iblogs\ib_logfile2 size to 31457280
InnoDB: Doublewrite buffer not found: creating new
InnoDB: Doublewrite buffer created
InnoDB: creating foreign key constraint system tables
InnoDB: foreign key constraint system tables created
011024 10:58:25  InnoDB: Started

When the server finishes its startup sequence, you should see something like this, which indicates that the server is ready to service client connections:

mysqld: ready for connections
Version: '8.0.4'  socket: ''  port: 3306

The server continues to write to the console any further diagnostic output it produces. You can open a new console window in which to run client programs.

If you omit the --console option, the server writes diagnostic output to the error log in the data directory (C:\Program Files\MySQL\MySQL Server 8.0\data by default). The error log is the file with the .err extension, and may be set using the --log-error option.

Note

The initial root account in the MySQL grant tables has no password. After starting the server, you should set up a password for it using the instructions in Section 2.9.4, “Securing the Initial MySQL Account”.

2.3.5.6 Starting MySQL from the Windows Command Line

The MySQL server can be started manually from the command line. This can be done on any version of Windows.

Note

MySQL Notifier can also be used to start/stop/restart the MySQL server.

To start the mysqld server from the command line, you should start a console window (or “DOS window”) and enter this command:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld"

The path to mysqld may vary depending on the install location of MySQL on your system.

You can stop the MySQL server by executing this command:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqladmin" -u root shutdown

Note

If the MySQL root user account has a password, you need to invoke mysqladmin with the -p option and supply the password when prompted.

This command invokes the MySQL administrative utility mysqladmin to connect to the server and tell it to shut down. The command connects as the MySQL root user, which is the default administrative account in the MySQL grant system.

Note

Users in the MySQL grant system are wholly independent from any login users under Microsoft Windows.

If mysqld doesn't start, check the error log to see whether the server wrote any messages there to indicate the cause of the problem. By default, the error log is located in the C:\Program Files\MySQL\MySQL Server 8.0\data directory. It is the file with a suffix of .err, or may be specified by passing in the --log-error option. Alternatively, you can try to start the server with the --console option; in this case, the server may display some useful information on the screen that will help solve the problem.

The last option is to start mysqld with the --standalone and --debug options. In this case, mysqld writes a log file C:\mysqld.trace that should contain the reason why mysqld doesn't start. See Section 28.5.3, “The DBUG Package”.

Use mysqld --verbose --help to display all the options that mysqld supports.

2.3.5.7 Customizing the PATH for MySQL Tools

Warning

You must exercise great care when editing your system PATH by hand; accidental deletion or modification of any portion of the existing PATH value can leave you with a malfunctioning or even unusable system.

To make it easier to invoke MySQL programs, you can add the path name of the MySQL bin directory to your Windows system PATH environment variable:

On the Windows desktop, right-click the My Computer icon, and select Properties.
Next select the Advanced tab from the System Properties menu that appears, and click the Environment Variables button.
Under System Variables, select Path, and then click the Edit button. The Edit System Variable dialogue should appear.
Place your cursor at the end of the text appearing in the space marked Variable Value. (Use the End key to ensure that your cursor is positioned at the very end of the text in this space.) Then enter the complete path name of your MySQL bin directory (for example, C:\Program Files\MySQL\MySQL Server 8.0\bin)

Note

There must be a semicolon separating this path from any values present in this field.

Dismiss this dialogue, and each dialogue in turn, by clicking OK until all of the dialogues that were opened have been dismissed. The new PATH value should now be available to any new command shell you open, allowing you to invoke any MySQL executable program by typing its name at the DOS prompt from any directory on the system, without having to supply the path. This includes the servers, the mysql client, and all MySQL command-line utilities such as mysqladmin and mysqldump.

You should not add the MySQL bin directory to your Windows PATH if you are running multiple MySQL servers on the same machine.

2.3.5.8 Starting MySQL as a Windows Service

On Windows, the recommended way to run MySQL is to install it as a Windows service, so that MySQL starts and stops automatically when Windows starts and stops. A MySQL server installed as a service can also be controlled from the command line using NET commands, or with the graphical Services utility. Generally, to install MySQL as a Windows service you should be logged in using an account that has administrator rights.

Note

MySQL Notifier can also be used to monitor the status of the MySQL service.

The Services utility (the Windows Service Control Manager) can be found in the Windows Control Panel (under Administrative Tools on Windows Vista, and Server 2003). To avoid conflicts, it is advisable to close the Services utility while performing server installation or removal operations from the command line.

Installing the service

Before installing MySQL as a Windows service, you should first stop the current server if it is running by using the following command:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqladmin"
          -u root shutdown

Note

If the MySQL root user account has a password, you need to invoke mysqladmin with the -p option and supply the password when prompted.

Note

Users in the MySQL grant system are wholly independent from any login users under Windows.

Install the server as a service using this command:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld" --install

The service-installation command does not start the server. Instructions for that are given later in this section.

To make it easier to invoke MySQL programs, you can add the path name of the MySQL bin directory to your Windows system PATH environment variable:

On the Windows desktop, right-click the My Computer icon, and select Properties.
Next select the Advanced tab from the System Properties menu that appears, and click the Environment Variables button.
Under System Variables, select Path, and then click the Edit button. The Edit System Variable dialogue should appear.
Place your cursor at the end of the text appearing in the space marked Variable Value. (Use the End key to ensure that your cursor is positioned at the very end of the text in this space.) Then enter the complete path name of your MySQL bin directory (for example, C:\Program Files\MySQL\MySQL Server 8.0\bin), and there should be a semicolon separating this path from any values present in this field. Dismiss this dialogue, and each dialogue in turn, by clicking OK until all of the dialogues that were opened have been dismissed. You should now be able to invoke any MySQL executable program by typing its name at the DOS prompt from any directory on the system, without having to supply the path. This includes the servers, the mysql client, and all MySQL command-line utilities such as mysqladmin and mysqldump.
You should not add the MySQL bin directory to your Windows PATH if you are running multiple MySQL servers on the same machine.

Warning

The following additional arguments can be used when installing the service:

You can specify a service name immediately following the --install option. The default service name is MySQL.
If a service name is given, it can be followed by a single option. By convention, this should be --defaults-file=file_name to specify the name of an option file from which the server should read options when it starts.
The use of a single option other than --defaults-file is possible but discouraged. --defaults-file is more flexible because it enables you to specify multiple startup options for the server by placing them in the named option file.
You can also specify a --local-service option following the service name. This causes the server to run using the LocalService Windows account that has limited system privileges. If both --defaults-file and --local-service are given following the service name, they can be in any order.

For a MySQL server that is installed as a Windows service, the following rules determine the service name and option files that the server uses:

If the service-installation command specifies no service name or the default service name (MySQL) following the --install option, the server uses the service name of MySQL and reads options from the [mysqld] group in the standard option files.
If the service-installation command specifies a service name other than MySQL following the --install option, the server uses that service name. It reads options from the [mysqld] group and the group that has the same name as the service in the standard option files. This enables you to use the [mysqld] group for options that should be used by all MySQL services, and an option group with the service name for use by the server installed with that service name.
If the service-installation command specifies a --defaults-file option after the service name, the server reads options the same way as described in the previous item, except that it reads options only from the named file and ignores the standard option files.

As a more complex example, consider the following command:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld"
          --install MySQL --defaults-file=C:\my-opts.cnf

Here, the default service name (MySQL) is given after the --install option. If no --defaults-file option had been given, this command would have the effect of causing the server to read the [mysqld] group from the standard option files. However, because the --defaults-file option is present, the server reads options from the [mysqld] option group, and only from the named file.

Note

On Windows, if the server is started with the --defaults-file and --install options, --install must be first. Otherwise, mysqld.exe will attempt to start the MySQL server.

You can also specify options as Start parameters in the Windows Services utility before you start the MySQL service.

Finally, before trying to start the MySQL service, make sure the user variables %TEMP% and %TMP% (and also %TMPDIR%, if it has ever been set) for the system user who is to run the service are pointing to a folder to which the user has write access. The default user for running the MySQL service is LocalSystem, and the default value for its %TEMP% and %TMP% is C:\Windows\Temp, a directory LocalSystem has write access to by default. However, if there are any changes to that default setup (for example, changes to the user who runs the service or to the mentioned user variables, or the --tmpdir option has been used to put the temporary directory somewhere else), the MySQL service might fail to run because write access to the temporary directory has not been granted to the proper user.

Starting the service

Once a MySQL server has been installed as a service, Windows starts the service automatically whenever Windows starts. The service also can be started immediately from the Services utility, or by using a NET START MySQL command. The NET command is not case sensitive.

When run as a service, mysqld has no access to a console window, so no messages can be seen there. If mysqld does not start, check the error log to see whether the server wrote any messages there to indicate the cause of the problem. The error log is located in the MySQL data directory (for example, C:\Program Files\MySQL\MySQL Server 8.0\data). It is the file with a suffix of .err.

When a MySQL server has been installed as a service, and the service is running, Windows stops the service automatically when Windows shuts down. The server also can be stopped manually by using the Services utility, the NET STOP MySQL command, or the mysqladmin shutdown command.

You also have the choice of installing the server as a manual service if you do not wish for the service to be started automatically during the boot process. To do this, use the --install-manual option rather than the --install option:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld" --install-manual

Removing the service

To remove a server that is installed as a service, first stop it if it is running by executing NET STOP MySQL. Then use the --remove option to remove it:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld" --remove

If mysqld is not running as a service, you can start it from the command line. For instructions, see Section 2.3.5.6, “Starting MySQL from the Windows Command Line”.

If you encounter difficulties during installation, see Section 2.3.6, “Troubleshooting a Microsoft Windows MySQL Server Installation”.

For more information about stopping or removing a MySQL Windows service, see Section 5.7.2.2, “Starting Multiple MySQL Instances as Windows Services”.

2.3.5.9 Testing The MySQL Installation

You can test whether the MySQL server is working by executing any of the following commands:

C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqlshow"
C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqlshow" -u root mysql
C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqladmin" version status proc
C:\> "C:\Program Files\MySQL\MySQL Server 8.0\bin\mysql" test

If mysqld is slow to respond to TCP/IP connections from client programs, there is probably a problem with your DNS. In this case, start mysqld with the --skip-name-resolve option and use only localhost and IP addresses in the Host column of the MySQL grant tables. (Be sure that an account exists that specifies an IP address or you may not be able to connect.)

You can force a MySQL client to use a named-pipe connection rather than TCP/IP by specifying the --pipe or --protocol=PIPE option, or by specifying . (period) as the host name. Use the --socket option to specify the name of the pipe if you do not want to use the default pipe name.

If you have set a password for the root account, deleted the anonymous account, or created a new user account, then to connect to the MySQL server you must use the appropriate -u and -p options with the commands shown previously. See Section 4.2.2, “Connecting to the MySQL Server”.

For more information about mysqlshow, see Section 4.5.8, “mysqlshow — Display Database, Table, and Column Information”.

2.3.6 Troubleshooting a Microsoft Windows MySQL Server Installation

When installing and running MySQL for the first time, you may encounter certain errors that prevent the MySQL server from starting. This section helps you diagnose and correct some of these errors.

Your first resource when troubleshooting server issues is the error log. The MySQL server uses the error log to record information relevant to the error that prevents the server from starting. The error log is located in the data directory specified in your my.ini file. The default data directory location is C:\Program Files\MySQL\MySQL Server 8.0\data, or C:\ProgramData\Mysql on Windows 7 and Windows Server 2008. The C:\ProgramData directory is hidden by default. You need to change your folder options to see the directory and contents. For more information on the error log and understanding the content, see Section 5.4.2, “The Error Log”.

For information regarding possible errors, also consult the console messages displayed when the MySQL service is starting. Use the NET START MySQL command from the command line after installing mysqld as a service to see any error messages regarding the starting of the MySQL server as a service. See Section 2.3.5.8, “Starting MySQL as a Windows Service”.

The following examples show other common error messages you might encounter when installing MySQL and starting the server for the first time:

If the MySQL server cannot find the mysql privileges database or other critical files, it displays these messages:
```
System error 1067 has occurred.
Fatal error: Can't open and lock privilege tables:
Table 'mysql.user' doesn't exist
```
These messages often occur when the MySQL base or data directories are installed in different locations than the default locations (C:\Program Files\MySQL\MySQL Server 8.0 and C:\Program Files\MySQL\MySQL Server 8.0\data, respectively).
This situation can occur when MySQL is upgraded and installed to a new location, but the configuration file is not updated to reflect the new location. In addition, old and new configuration files might conflict. Be sure to delete or rename any old configuration files when upgrading MySQL.
If you have installed MySQL to a directory other than C:\Program Files\MySQL\MySQL Server 8.0, ensure that the MySQL server is aware of this through the use of a configuration (my.ini) file. Put the my.ini file in your Windows directory, typically C:\WINDOWS. To determine its exact location from the value of the WINDIR environment variable, issue the following command from the command prompt:
```
C:\> echo %WINDIR%
```
You can create or modify an option file with any text editor, such as Notepad. For example, if MySQL is installed in E:\mysql and the data directory is D:\MySQLdata, you can create the option file and set up a [mysqld] section to specify values for the basedir and datadir options:
```
[mysqld]
# set basedir to your installation path
basedir=E:/mysql
# set datadir to the location of your data directory
datadir=D:/MySQLdata
```
Microsoft Windows path names are specified in option files using (forward) slashes rather than backslashes. If you do use backslashes, double them:
```
[mysqld]
# set basedir to your installation path
basedir=C:\\Program Files\\MySQL\\MySQL Server 8.0
# set datadir to the location of your data directory
datadir=D:\\MySQLdata
```
The rules for use of backslash in option file values are given in Section 4.2.6, “Using Option Files”.
If you change the datadir value in your MySQL configuration file, you must move the contents of the existing MySQL data directory before restarting the MySQL server.
See Section 2.3.5.2, “Creating an Option File”.
If you reinstall or upgrade MySQL without first stopping and removing the existing MySQL service and install MySQL using the MySQL Installer, you might see this error:
```
Error: Cannot create Windows service for MySql. Error: 0
```
This occurs when the Configuration Wizard tries to install the service and finds an existing service with the same name.
One solution to this problem is to choose a service name other than mysql when using the configuration wizard. This enables the new service to be installed correctly, but leaves the outdated service in place. Although this is harmless, it is best to remove old services that are no longer in use.
To permanently remove the old mysql service, execute the following command as a user with administrative privileges, on the command line:
```
C:\> sc delete mysql
[SC] DeleteService SUCCESS
```
If the sc utility is not available for your version of Windows, download the delsrv utility from http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/delsrv-o.asp and use the delsrv mysql syntax.

2.3.7 Windows Postinstallation Procedures

GUI tools exist that perform most of the tasks described in this section, including:

MySQL Installer: Used to install and upgrade MySQL products.
MySQL Workbench: Manages the MySQL server and edits SQL statements.
MySQL Notifier: Starts, stops, or restarts the MySQL server, and monitors its status.
MySQL for Excel: Edits MySQL data with Microsoft Excel.

If necessary, initialize the data directory and create the MySQL grant tables. Windows installation operations performed by MySQL Installer initialize the data directory automatically. For installation from a Zip package, you can initialize the data directory as described at Section 2.9.1.1, “Initializing the Data Directory Manually Using mysqld”.

Regarding passwords, if you installed MySQL using the MySQL Installer, you may have already assigned a passwords to the initial root account. (See Section 2.3.3, “MySQL Installer for Windows”.) Otherwise, use the password-assignment procedure given in Section 2.9.4, “Securing the Initial MySQL Account”.

Before assigning passwords, you might want to try running some client programs to make sure that you can connect to the server and that it is operating properly. Make sure that the server is running (see Section 2.3.5.5, “Starting the Server for the First Time”). You can also set up a MySQL service that runs automatically when Windows starts (see Section 2.3.5.8, “Starting MySQL as a Windows Service”).

These instructions assume that your current location is the MySQL installation directory and that it has a bin subdirectory containing the MySQL programs used here. If that is not true, adjust the command path names accordingly.

If you installed MySQL using MySQL Installer (see Section 2.3.3, “MySQL Installer for Windows”), the default installation directory is C:\Program Files\MySQL\MySQL Server 8.0:

C:\> cd "C:\Program Files\MySQL\MySQL Server 8.0"

A common installation location for installation from a Zip package is C:\mysql:

C:\> cd C:\mysql

Alternatively, add the bin directory to your PATH environment variable setting. That enables your command interpreter to find MySQL programs properly, so that you can run a program by typing only its name, not its path name. See Section 2.3.5.7, “Customizing the PATH for MySQL Tools”.

With the server running, issue the following commands to verify that you can retrieve information from the server. The output should be similar to that shown here.

Use mysqlshow to see what databases exist:

C:\> bin\mysqlshow
+--------------------+
|     Databases      |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

The list of installed databases may vary, but will always include the minimum of mysql and information_schema.

The preceding command (and commands for other MySQL programs such as mysql) may not work if the correct MySQL account does not exist. For example, the program may fail with an error, or you may not be able to view all databases. If you installed MySQL using MySQL Installer, the root user will have been created automatically with the password you supplied. In this case, you should use the -u root and -p options. (You must use those options if you have already secured the initial MySQL accounts.) With -p, the client program prompts for the root password. For example:

C:\> bin\mysqlshow -u root -p
Enter password: (enter root password here)
+--------------------+
|     Databases      |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

If you specify a database name, mysqlshow displays a list of the tables within the database:

C:\> bin\mysqlshow mysql
Database: mysql
+---------------------------+
|          Tables           |
+---------------------------+
| columns_priv              |
| db                        |
| engine_cost               |
| event                     |
| func                      |
| general_log               |
| gtid_executed             |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| innodb_index_stats        |
| innodb_table_stats        |
| ndb_binlog_index          |
| plugin                    |
| proc                      |
| procs_priv                |
| proxies_priv              |
| server_cost               |
| servers                   |
| slave_master_info         |
| slave_relay_log_info      |
| slave_worker_info         |
| slow_log                  |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+

Use the mysql program to select information from a table in the mysql database:

C:\> bin\mysql -e "SELECT User, Host, plugin FROM mysql.user" mysql
+------+-----------+-----------------------+
| User | Host      | plugin                |
+------+-----------+-----------------------+
| root | localhost | mysql_native_password |
+------+-----------+-----------------------+

For more information about mysql and mysqlshow, see Section 4.5.1, “mysql — The MySQL Command-Line Tool”, and Section 4.5.8, “mysqlshow — Display Database, Table, and Column Information”.

2.3.8 Upgrading MySQL on Windows

To upgrade MySQL on Windows, follow these steps:

Review Section 2.10.1, “Upgrading MySQL”, for additional information on upgrading MySQL that is not specific to Windows.
Always back up your current MySQL installation before performing an upgrade. See Section 7.2, “Database Backup Methods”.
Download the latest Windows distribution of MySQL from http://dev.mysql.com/downloads/.
Before upgrading MySQL, stop the server. If the server is installed as a service, stop the service with the following command from the command prompt:
```
C:\> NET STOP MySQL
```
If you are not running the MySQL server as a service, use mysqladmin to stop it. For example, before upgrading from MySQL 5.7 to 8.0, use mysqladmin from MySQL 5.7 as follows:
```
C:\> "C:\Program Files\MySQL\MySQL Server 5.7\bin\mysqladmin" -u root shutdown
```
Note

If the MySQL root user account has a password, invoke mysqladmin with the -p option and enter the password when prompted.
Before upgrading to MySQL 8.0 from a version previous to 4.1.5, or from a version of MySQL installed from a Zip archive to a version of MySQL installed with the MySQL Installation Wizard, you must first manually remove the previous installation and MySQL service (if the server is installed as a service).
To remove the MySQL service, use the following command:
```
C:\> C:\mysql\bin\mysqld --remove
```
If you do not remove the existing service, the MySQL Installation Wizard may fail to properly install the new MySQL service.
If you are using the MySQL Installer, start it as described in Section 2.3.3, “MySQL Installer for Windows”.
If you are upgrading MySQL from a Zip archive, extract the archive. You may either overwrite your existing MySQL installation (usually located at C:\mysql), or install it into a different directory, such as C:\mysql5. Overwriting the existing installation is recommended. However, for upgrades (as opposed to installing for the first time), you must remove the data directory from your existing MySQL installation to avoid replacing your current data files. To do so, follow these steps:
1. Unzip the Zip archive in some location other than your current MySQL installation
2. Remove the data directory
3. Rezip the Zip archive
4. Unzip the modified Zip archive on top of your existing installation
Alternatively:
1. Unzip the Zip archive in some location other than your current MySQL installation
2. Remove the data directory
3. Move the data directory from the current MySQL installation to the location of the just-removed data directory
4. Remove the current MySQL installation
5. Move the unzipped installation to the location of the just-removed installation
If you were running MySQL as a Windows service and you had to remove the service earlier in this procedure, reinstall the service. (See Section 2.3.5.8, “Starting MySQL as a Windows Service”.)
Restart the server. For example, use NET START MySQL if you run MySQL as a service, or invoke mysqld directly otherwise.
As Administrator, run mysql_upgrade to check your tables, attempt to repair them if necessary, and update your grant tables if they have changed so that you can take advantage of any new capabilities. See Section 4.4.5, “mysql_upgrade — Check and Upgrade MySQL Tables”.
If you encounter errors, see Section 2.3.6, “Troubleshooting a Microsoft Windows MySQL Server Installation”.

2.4 Installing MySQL on OS X

2.4.1 General Notes on Installing MySQL on OS X
2.4.2 Installing MySQL on OS X Using Native Packages
2.4.3 Installing a MySQL Launch Daemon
2.4.4 Installing and Using the MySQL Preference Pane

For a list of OS X versions that the MySQL server supports, see http://www.mysql.com/support/supportedplatforms/database.html.

MySQL for OS X is available in a number of different forms:

Native Package Installer, which uses the native OS X installer (DMG) to walk you through the installation of MySQL. For more information, see Section 2.4.2, “Installing MySQL on OS X Using Native Packages”. You can use the package installer with OS X. The user you use to perform the installation must have administrator privileges.
Compressed TAR archive, which uses a file packaged using the Unix tar and gzip commands. To use this method, you will need to open a Terminal window. You do not need administrator privileges using this method, as you can install the MySQL server anywhere using this method. For more information on using this method, you can use the generic instructions for using a tarball, Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”.
In addition to the core installation, the Package Installer also includes Section 2.4.3, “Installing a MySQL Launch Daemon” and Section 2.4.4, “Installing and Using the MySQL Preference Pane”, both of which simplify the management of your installation.

For additional information on using MySQL on OS X, see Section 2.4.1, “General Notes on Installing MySQL on OS X”.

2.4.1 General Notes on Installing MySQL on OS X

You should keep the following issues and notes in mind:

A launchd daemon is installed, and it includes MySQL configuration options. Consider editing it if needed, see the documentation below for additional information. Also, macOS 10.10 removed startup item support in favor of launchd daemons. The optional MySQL preference pane under macOS System Preferences uses the launchd daemon.
You may need (or want) to create a specific mysql user to own the MySQL directory and data. You can do this through the Directory Utility, and the mysql user should already exist. For use in single user mode, an entry for _mysql (note the underscore prefix) should already exist within the system /etc/passwd file.
Because the MySQL package installer installs the MySQL contents into a version and platform specific directory, you can use this to upgrade and migrate your database between versions. You will need to either copy the data directory from the old version to the new version, or alternatively specify an alternative datadir value to set location of the data directory. By default, the MySQL directories are installed under /usr/local/.
You might want to add aliases to your shell's resource file to make it easier to access commonly used programs such as mysql and mysqladmin from the command line. The syntax for bash is:
```
alias mysql=/usr/local/mysql/bin/mysql
alias mysqladmin=/usr/local/mysql/bin/mysqladmin
```
For tcsh, use:
```
alias mysql /usr/local/mysql/bin/mysql
alias mysqladmin /usr/local/mysql/bin/mysqladmin
```
Even better, add /usr/local/mysql/bin to your PATH environment variable. You can do this by modifying the appropriate startup file for your shell. For more information, see Section 4.2.1, “Invoking MySQL Programs”.
After you have copied over the MySQL database files from the previous installation and have successfully started the new server, you should consider removing the old installation files to save disk space. Additionally, you should also remove older versions of the Package Receipt directories located in /Library/Receipts/mysql-VERSION.pkg.
Prior to OS X 10.7, MySQL server was bundled with OS X Server.

2.4.2 Installing MySQL on OS X Using Native Packages

The package is located inside a disk image (.dmg) file that you first need to mount by double-clicking its icon in the Finder. It should then mount the image and display its contents.

Note

Before proceeding with the installation, be sure to stop all running MySQL server instances by using either the MySQL Manager Application (on OS X Server), the preference pane, or mysqladmin shutdown on the command line.

To install MySQL using the package installer:

Download the disk image (.dmg) file (the community version is available here) that contains the MySQL package installer. Double-click the file to mount the disk image and see its contents.

Figure 2.22 MySQL Package Installer: DMG Contents
Double-click the MySQL installer package. It will be named according to the version of MySQL you have downloaded. For example, if you have downloaded MySQL server 8.0.4, double-click mysql-8.0.4-osx-10.11-x86_64.pkg.
You will be presented with the opening installer dialog. Click Continue to begin installation.

Figure 2.23 MySQL Package Installer: Introduction
If you have downloaded the community version of MySQL, you will be shown a copy of the relevant GNU General Public License. Click Continue and then Agree to continue.
From the Installation Type page you can either click Install to execute the installation wizard using all defaults, click Customize to alter which components to install (MySQL server, Preference Pane, Launchd Support -- all enabled by default), or click Change Installation Location to change the type of installation, if available.

Figure 2.24 MySQL Package Installer: Installation Type

Figure 2.25 MySQL Package Installer: Destination Select (Change Installation Location)

Figure 2.26 MySQL Package Installer: Customize
Click Install to begin the installation process.
Once the installation has been completed successfully, you will be provided with your temporary root password. This cannot be recovered, so you must save this password. For example:

Figure 2.27 MySQL Package Installer: Temporary Root Password

Note

After logging into MySQL using this temporary password, MySQL will expire this password and require you to create a new password.
Next is an Install Succeeded message with a short summary. Close the wizard.

Figure 2.28 MySQL Package Installer: Summary

MySQL server is now installed, but it is not loaded (or started) by default. Use either launchctl from the command line, or start MySQL by clicking "Start" using the MySQL preference pane. For additional information, see Section 2.4.3, “Installing a MySQL Launch Daemon”, and Section 2.4.4, “Installing and Using the MySQL Preference Pane”. Use the MySQL Preference Pane or launchd to configure MySQL to automatically start at bootup.

When installing using the package installer, the files are installed into a directory within /usr/local matching the name of the installation version and platform. For example, the installer file mysql-8.0.4-osx10.11-x86_64.dmg installs MySQL into /usr/local/mysql-8.0.4-osx10.11-x86_64/. The following table shows the layout of the installation directory.

Table 2.6 MySQL Installation Layout on OS X

Directory	Contents of Directory
`bin`	mysqld server, client and utility programs
`data`	Log files, databases
`docs`	Helper documents, like the Release Notes and build information
`include`	Include (header) files
`lib`	Libraries
`man`	Unix manual pages
`mysql-test`	MySQL test suite
`share`	Miscellaneous support files, including error messages, sample configuration files, SQL for database installation
`support-files`	Scripts and sample configuration files
`/tmp/mysql.sock`	Location of the MySQL Unix socket

During the package installer process, a symbolic link from /usr/local/mysql to the version/platform specific directory created during installation will be created automatically.

2.4.3 Installing a MySQL Launch Daemon

OS X uses launch daemons to automatically start, stop, and manage processes and applications such as MySQL.

By default, the installation package (DMG) on OS X installs a launchd file named /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist that contains a plist definition similar to:


<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>             <string>com.oracle.oss.mysql.mysqld</string>
    <key>ProcessType</key>       <string>Interactive</string>
    <key>Disabled</key>          <false/>
    <key>RunAtLoad</key>         <true/>
    <key>KeepAlive</key>         <true/>
    <key>SessionCreate</key>     <true/>
    <key>LaunchOnlyOnce</key>    <false/>
    <key>UserName</key>          <string>_mysql</string>
    <key>GroupName</key>         <string>_mysql</string>
    <key>ExitTimeOut</key>       <integer>600</integer>
    <key>Program</key>           <string>/usr/local/mysql/bin/mysqld</string>
    <key>ProgramArguments</key>
        <array>
            <string>/usr/local/mysql/bin/mysqld</string>
            <string>--user=_mysql</string>
            <string>--basedir=/usr/local/mysql</string>
            <string>--datadir=/usr/local/mysql/data</string>
            <string>--plugin-dir=/usr/local/mysql/lib/plugin</string>
            <string>--log-error=/usr/local/mysql/data/mysqld.local.err</string>
            <string>--pid-file=/usr/local/mysql/data/mysqld.local.pid</string>
        </array>
    <key>WorkingDirectory</key>  <string>/usr/local/mysql</string>
</dict>
</plist>

Note

Some users report that adding a plist DOCTYPE declaration causes the launchd operation to fail, despite it passing the lint check. We suspect it's a copy-n-paste error. The md5 checksum of a file containing the above snippet is 24710a27dc7a28fb7ee6d825129cd3cf.

To enable the launchd service, you can either:

Click Start MySQL Server from the MySQL preference pane.

Figure 2.29 MySQL Preference Pane: Location

Figure 2.30 MySQL Preference Pane: Usage

Or, manually load the launchd file.

shell> cd /Library/LaunchDaemons
shell> sudo launchctl load -F com.oracle.oss.mysql.mysqld.plist

To configure MySQL to automatically start at bootup, you can:

shell> sudo launchctl load -w com.oracle.oss.mysql.mysqld.plist

Note

When upgrading MySQL server, the launchd installation process will remove the old startup items that were installed with MySQL server 5.7.7 and below.

Also, upgrading will replace your existing launchd file of the same name.

Additional launchd related information:

The plist entries override my.cnf entries, because they are passed in as command line arguments. For additional information about passing in program options, see Section 4.2.3, “Specifying Program Options”.
The ProgramArguments section defines the command line options that are passed into the program, which is the mysqld binary in this case.
The default plist definition is written with less sophisticated use cases in mind. For more complicated setups, you may want to remove some of the arguments and instead rely on a MySQL configuration file, such as my.cnf.
If you edit the plist file, then uncheck the installer option when reinstalling or upgrading MySQL. Otherwise, your edited plist file will be overwritten, and all edits will be lost.

Because the default plist definition defines several ProgramArguments, you might remove most of these arguments and instead rely upon your my.cnf MySQL configuration file to define them. For example:


<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>             <string>com.oracle.oss.mysql.mysqld</string>
    <key>ProcessType</key>       <string>Interactive</string>
    <key>Disabled</key>          <false/>
    <key>RunAtLoad</key>         <true/>
    <key>KeepAlive</key>         <true/>
    <key>SessionCreate</key>     <true/>
    <key>LaunchOnlyOnce</key>    <false/>
    <key>UserName</key>          <string>_mysql</string>
    <key>GroupName</key>         <string>_mysql</string>
    <key>ExitTimeOut</key>       <integer>600</integer>
    <key>Program</key>           <string>/usr/local/mysql/bin/mysqld</string>
    <key>WorkingDirectory</key>  <string>/usr/local/mysql</string>
    <key>ProgramArguments</key>
        <array>
            <string>/usr/local/mysql/bin/mysqld</string>
            <string>--user=_mysql</string>
        </array>
</dict>
</plist>

In this case, the basedir, datadir, plugin_dir, log_error, and pid_file options were removed from the plist definition, and then you you might define them in my.cnf.

2.4.4 Installing and Using the MySQL Preference Pane

The MySQL Installation Package includes a MySQL preference pane that enables you to start, stop, and control automated startup during boot of your MySQL installation.

This preference pane is installed by default, and is listed under your system's System Preferences window.

Figure 2.31 MySQL Preference Pane: Location

To install the MySQL Preference Pane:

Download the disk image (.dmg) file (the community version is available here) that contains the MySQL package installer. Double-click the file to mount the disk image and see its contents.

Figure 2.32 MySQL Package Installer: DMG Contents
Go through the process of installing the MySQL server, as described in the documentation at Section 2.4.2, “Installing MySQL on OS X Using Native Packages”.
Click Customize at the Installation Type step. The "Preference Pane" option is listed there and enabled by default; make sure it is not deselected.

Figure 2.33 MySQL Installer on OS X: Customize
Complete the MySQL server installation process.

Note

The MySQL preference pane only starts and stops MySQL installation installed from the MySQL package installation that have been installed in the default location.

Once the MySQL preference pane has been installed, you can control your MySQL server instance using the preference pane. To use the preference pane, open the System Preferences... from the Apple menu. Select the MySQL preference pane by clicking the MySQL logo within the bottom section of the preference panes list.

Figure 2.34 MySQL Preference Pane: Location

Figure 2.35 MySQL Preference Pane: Usage

The MySQL Preference Pane shows the current status of the MySQL server, showing stopped (in red) if the server is not running and running (in green) if the server has already been started. The preference pane also shows the current setting for whether the MySQL server has been set to start automatically.

To start the MySQL server using the preference pane:
Click Start MySQL Server. You may be prompted for the username and password of a user with administrator privileges to start the MySQL server.
To stop the MySQL server using the preference pane:
Click Stop MySQL Server. You may be prompted for the username and password of a user with administrator privileges to stop the MySQL server.
To automatically start the MySQL server when the system boots:
Check the check box next to Automatically Start MySQL Server on Startup.
To disable automatic MySQL server startup when the system boots:
Uncheck the check box next to Automatically Start MySQL Server on Startup.

You can close the System Preferences... window once you have completed your settings.

2.5 Installing MySQL on Linux

2.5.1 Installing MySQL on Linux Using the MySQL Yum Repository
2.5.2 Installing MySQL on Linux Using the MySQL APT Repository
2.5.3 Installing MySQL on Linux Using the MySQL SLES Repository
2.5.4 Installing MySQL on Linux Using RPM Packages from Oracle
2.5.5 Installing MySQL on Linux Using Debian Packages from Oracle
2.5.6 Installing MySQL on Linux from the Native Software Repositories
2.5.7 Installing MySQL on Linux with Docker
2.5.8 Installing MySQL on Linux with Juju
2.5.9 Managing MySQL Server with systemd

Linux supports a number of different solutions for installing MySQL. We recommend that you use one of the distributions from Oracle, for which several methods for installation are available:

Installing with Yum using the MySQL Yum repository. For details, see Section 2.5.1, “Installing MySQL on Linux Using the MySQL Yum Repository”.
Installing with APT using the MySQL APT Repository. For details, see Section 2.5.2, “Installing MySQL on Linux Using the MySQL APT Repository”.
Installing with Zypper using the MySQL SLES Repository. For details, see Section 2.5.3, “Installing MySQL on Linux Using the MySQL SLES Repository”.
Installing using a precompiled RPM package. For more information, see Section 2.5.4, “Installing MySQL on Linux Using RPM Packages from Oracle”.
Installing using a precompiled Debian package. For more information, see Section 2.5.5, “Installing MySQL on Linux Using Debian Packages from Oracle”.
Installing from a generic binary package in .tar.gz format. See Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries” for more information.
Extracting and compiling MySQL from a source distribution. For detailed instructions, see Section 2.8, “Installing MySQL from Source”.

As an alternative, you can use the package manager on your system to automatically download and install MySQL with packages from the native software repositories of your Linux distribution. These native packages are often several versions behind the currently available release. You will also normally be unable to install development milestone releases (DMRs), as these are not usually made available in the native repositories. For more information on using the native package installers, see Section 2.5.6, “Installing MySQL on Linux from the Native Software Repositories”.

Note

For many Linux installations, you will want to set up MySQL to be started automatically when your machine starts. Many of the native package installations perform this operation for you, but for source, binary and RPM solutions you may need to set this up separately. The required script, mysql.server, can be found in the support-files directory under the MySQL installation directory or in a MySQL source tree. You can install it as /etc/init.d/mysql for automatic MySQL startup and shutdown. See Section 4.3.3, “mysql.server — MySQL Server Startup Script”.

2.5.1 Installing MySQL on Linux Using the MySQL Yum Repository

The MySQL Yum repository for Oracle Linux, Red Hat Enterprise Linux, CentOS, and Fedora provides RPM packages for installing the MySQL server, client, MySQL Workbench, MySQL Utilities, MySQL Router, MySQL Shell, Connector/ODBC, Connector/Python and so on (not all packages are available for all the distributions; see Installing Additional MySQL Products and Components with Yum for details).

Before You Start

As a popular, open-source software, MySQL, in its original or re-packaged form, is widely installed on many systems from various sources, including different software download sites, software repositories, and so on. The following instructions assume that MySQL is not already installed on your system using a third-party-distributed RPM package; if that is not the case, follow the instructions given in Section 2.10.1.2, “Upgrading MySQL with the MySQL Yum Repository” or Replacing a Third-Party Distribution of MySQL Using the MySQL Yum Repository.

Steps for a Fresh Installation of MySQL

Follow the steps below to install the latest GA version of MySQL with the MySQL Yum repository:

Adding the MySQL Yum Repository

First, add the MySQL Yum repository to your system's repository list. This is a one-time operation, which can be performed by installing an RPM provided by MySQL. Follow these steps:
1. Go to the Download MySQL Yum Repository page (http://dev.mysql.com/downloads/repo/yum/) in the MySQL Developer Zone.
2. Select and download the release package for your platform.
3. Install the downloaded release package with the following command, replacing platform-and-version-specific-package-name with the name of the downloaded RPM package:
```
shell> sudo yum localinstall platform-and-version-specific-package-name.rpm
```
  For an EL6-based system, the command is in the form of:
```
shell> sudo yum localinstall mysql57-community-release-el6-{version-number}.noarch.rpm
```
  For an EL7-based system:
```
shell> sudo yum localinstall mysql57-community-release-el7-{version-number}.noarch.rpm
```
  For Fedora 25:
```
shell> sudo dnf localinstall mysql57-community-release-fc25-{version-number}.noarch.rpm
```
  For Fedora 26:
```
shell> sudo dnf localinstall mysql57-community-release-fc26-{version-number}.noarch.rpm
```
  The installation command adds the MySQL Yum repository to your system's repository list and downloads the GnuPG key to check the integrity of the software packages. See Section 2.1.3.2, “Signature Checking Using GnuPG” for details on GnuPG key checking.
  You can check that the MySQL Yum repository has been successfully added by the following command (for dnf-enabled systems, replace yum in the command with dnf):
```
shell> yum repolist enabled | grep "mysql.*-community.*"
```
Note

Once the MySQL Yum repository is enabled on your system, any system-wide update by the yum update command (or dnf upgrade for dnf-enabled systems) will upgrade MySQL packages on your system and also replace any native third-party packages, if Yum finds replacements for them in the MySQL Yum repository; see Section 2.10.1.2, “Upgrading MySQL with the MySQL Yum Repository” and, for a discussion on some possible effects of that on your system, see Upgrading the Shared Client Libraries.
Selecting a Release Series

When using the MySQL Yum repository, the latest GA series (currently MySQL 5.7) is selected for installation by default. If this is what you want, you can skip to the next step, Installing MySQL.
Within the MySQL Yum repository, different release series of the MySQL Community Server are hosted in different subrepositories. The subrepository for the latest GA series (currently MySQL 5.7) is enabled by default, and the subrepositories for all other series (for example, the MySQL 8.0 series) are disabled by default. Use this command to see all the subrepositories in the MySQL Yum repository, and see which of them are enabled or disabled (for dnf-enabled systems, replace yum in the command with dnf):
```
shell> yum repolist all | grep mysql
```
To install the latest release from the latest GA series, no configuration is needed. To install the latest release from a specific series other than the latest GA series, disable the subrepository for the latest GA series and enable the subrepository for the specific series before running the installation command. If your platform supports yum-config-manager, you can do that by issuing these commands, which disable the subrepository for the 5.7 series and enable the one for the 8.0 series:
```
shell> sudo yum-config-manager --disable mysql57-community
shell> sudo yum-config-manager --enable mysql80-community
```
For dnf-enabled platforms:
```
shell> sudo dnf config-manager --disable mysql57-community
shell> sudo dnf config-manager --enable mysql80-community
```
Besides using yum-config-manager or the dnf config-manager command, you can also select a release series by editing manually the /etc/yum.repos.d/mysql-community.repo file. This is a typical entry for a release series' subrepository in the file:
```
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
```
Find the entry for the subrepository you want to configure, and edit the enabled option. Specify enabled=0 to disable a subrepository, or enabled=1 to enable a subrepository. For example, to install MySQL 8.0, make sure you have enabled=0 for the above subrepository entry for MySQL 5.7, and have enabled=1 for the entry for the 8.0 series:
```
# Enable to use MySQL 8.0
[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
```
You should only enable subrepository for one release series at any time. When subrepositories for more than one release series are enabled, the latest series will be used by Yum.
Verify that the correct subrepositories have been enabled and disabled by running the following command and checking its output (for dnf-enabled systems, replace yum in the command with dnf):
```
shell> yum repolist enabled | grep mysql
```
Installing MySQL

Install MySQL by the following command (for dnf-enabled systems, replace yum in the command with dnf):
```
shell> sudo yum install mysql-community-server
```
This installs the package for MySQL server (mysql-community-server) and also packages for the components required to run the server, including packages for the client (mysql-community-client), the common error messages and character sets for client and server (mysql-community-common), and the shared client libraries (mysql-community-libs).
Starting the MySQL Server

Start the MySQL server with the following command:
```
shell> sudo service mysqld start
Starting mysqld:[ OK ]
```
You can check the status of the MySQL server with the following command:
```
shell> sudo service mysqld status
mysqld (pid 3066) is running.
```

At the initial start up of the server, the following happens, given that the data directory of the server is empty:

The server is initialized.
SSL certificate and key files are generated in the data directory.
The validate_password plugin is installed and enabled.
A superuser account 'root'@'localhost is created. A password for the superuser is set and stored in the error log file. To reveal it, use the following command:
```
shell> sudo grep 'temporary password' /var/log/mysqld.log
```
Change the root password as soon as possible by logging in with the generated, temporary password and set a custom password for the superuser account:
```
shell> mysql -uroot -p 
```
```
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';
```
Note

MySQL's validate_password plugin is installed by default. This will require that passwords contain at least one upper case letter, one lower case letter, one digit, and one special character, and that the total password length is at least 8 characters.

For more information on the postinstallation procedures, see Section 2.9, “Postinstallation Setup and Testing”.

Note

Compatibility Information for EL7-based platforms: The following RPM packages from the native software repositories of the platforms are incompatible with the package from the MySQL Yum repository that installs the MySQL server. Once you have installed MySQL using the MySQL Yum repository, you will not be able to install these packages (and vice versa).

akonadi-mysql

Installing Additional MySQL Products and Components with Yum

You can use Yum to install and manage individual components of MySQL. Some of these components are hosted in sub-repositories of the MySQL Yum repository: for example, the MySQL Connectors are to be found in the MySQL Connectors Community sub-repository, and the MySQL Workbench in MySQL Tools Community. You can use the following command to list the packages for all the MySQL components available for your platform from the MySQL Yum repository (for dnf-enabled systems, replace yum in the command with dnf):

shell> sudo yum --disablerepo=\* --enablerepo='mysql*-community*' list available

Install any packages of your choice with the following command, replacing package-name with name of the package (for dnf-enabled systems, replace yum in the command with dnf):

shell> sudo yum install package-name

For example, to install MySQL Workbench on Fedora:

shell> sudo dnf install mysql-workbench-community

To install the shared client libraries (for dnf-enabled systems, replace yum in the command with dnf):

shell> sudo yum install mysql-community-libs

Updating MySQL with Yum

Besides installation, you can also perform updates for MySQL products and components using the MySQL Yum repository. See Section 2.10.1.2, “Upgrading MySQL with the MySQL Yum Repository” for details.

2.5.2 Installing MySQL on Linux Using the MySQL APT Repository

The MySQL APT repository provides deb packages for installing and managing the MySQL server, client, and other components on the following Linux platforms: :

Debian 8.x (“jessie”)
Ubuntu 14.04 LTS (“Trusty Tahr”)
Ubuntu 16.04 (“Xenial Xerus”)

Instructions for using the MySQL APT Repository are available in A Quick Guide to Using the MySQL APT Repository.

2.5.3 Installing MySQL on Linux Using the MySQL SLES Repository

The MySQL SLES repository provides RPM packages for installing and managing the MySQL server, client, and other components on SUSE Enterprise Linux Server.

Instructions for using the MySQL SLES repository are available in A Quick Guide to Using the MySQL SLES Repository.

Note

The MySQL SLES repository is now in development release. We encourage you to try it and provide us with feedback. Please report any bugs or inconsistencies you observe to our Bugs Database.

2.5.4 Installing MySQL on Linux Using RPM Packages from Oracle

The recommended way to install MySQL on RPM-based Linux distributions is by using the RPM packages provided by Oracle. There are two sources for obtaining them, for the Community Edition of MySQL:

From the MySQL software repositories:
- The MySQL Yum repository (see Section 2.5.1, “Installing MySQL on Linux Using the MySQL Yum Repository” for details).
- The MySQL SLES repository (see Section 2.5.3, “Installing MySQL on Linux Using the MySQL SLES Repository” for details).
From the Download MySQL Community Server page in the MySQL Developer Zone.

Note

RPM distributions of MySQL are also provided by other vendors. Be aware that they may differ from those built by Oracle in features, capabilities, and conventions (including communication setup), and that the installation instructions in this manual do not necessarily apply to them. The vendor's instructions should be consulted instead.

RPM packages for MySQL are listed in the following tables:

Table 2.7 RPM Packages for MySQL Community Edition

Package Name	Summary
`mysql-community-server`	Database server and related tools
`mysql-community-client`	MySQL client applications and tools
`mysql-community-common`	Common files for server and client libraries
`mysql-community-devel`	Development header files and libraries for MySQL database client applications
`mysql-community-libs`	Shared libraries for MySQL database client applications
`mysql-community-libs-compat`	Shared compatibility libraries for previous MySQL installations
`mysql-community-test`	Test suite for the MySQL server

Table 2.8 RPM Packages for the MySQL Enterprise Edition

Package Name	Summary
`mysql-commercial-server`	Database server and related tools
`mysql-commercial-client`	MySQL client applications and tools
`mysql-commercial-common`	Common files for server and client libraries
`mysql-commercial-devel`	Development header files and libraries for MySQL database client applications
`mysql-commercial-libs`	Shared libraries for MySQL database client applications
`mysql-commercial-libs-compat`	Shared compatibility libraries for previous MySQL installations
`mysql-commercial-test`	Test suite for the MySQL server

The full names for the RPMs have the following syntax:

packagename-version-distribution-arch.rpm

The distribution and arch values indicate the Linux distribution and the processor type for which the package was built. See the table below for lists of the distribution identifiers:

Table 2.9 MySQL Linux RPM Package Distribution Identifiers

distribution Value	Intended Use
`el6`, `el7`	Red Hat Enterprise Linux/Oracle Linux/CentOS 6 or 7
`fc25`, `fc26`	Fedora25 or 26
`sles12`	SUSE Linux Enterprise Server 12

To see all files in an RPM package (for example, mysql-community-server), use the following command:

shell> rpm -qpl mysql-community-server-version-distribution-arch.rpm

The discussion in the rest of this section applies only to an installation process using the RPM packages directly downloaded from Oracle, instead of through a MySQL repository.

Dependency relationships exist among some of the packages. If you plan to install many of the packages, you may wish to download the RPM bundle tar file instead, which contains all the RPM packages listed above, so that you need not download them separately.

In most cases, you need to install the mysql-community-server, mysql-community-client, mysql-community-libs, mysql-community-common, and mysql-community-libs-compat packages to get a functional, standard MySQL installation. To perform such a standard, minimal installation, go to the folder that contains all those packages (and, preferably, no other RPM packages with similar names), and issue the following command:

shell> sudo yum install mysql-community-{server,client,common,libs}-*

Replace yum with zypper for SLES, and with dnf for Fedora.

While it is much preferable to use a high-level package management tool like yum to install the packages, users who prefer direct rpm commands can replace the yum install command with the rpm -Uvh command; however, using rpm -Uvh instead makes the installation process more prone to failure, due to potential dependency issues the installation process might run into.

To install only the client programs, you can skip mysql-community-server in your list of packages to install; issue the following command:

shell> sudo yum install mysql-community-{client,common,libs}-*

Replace yum with zypper for SLES, and with dnf for Fedora.

A standard installation of MySQL using the RPM packages result in files and resources created under the system directories, shown in the following table.

Table 2.10 MySQL Installation Layout for Linux RPM Packages from the MySQL Developer Zone

Files or Resources	Location
Client programs and scripts	`/usr/bin`
mysqld server	`/usr/sbin`
Configuration file	`/etc/my.cnf`
Data directory	`/var/lib/mysql`
Error log file	For RHEL, Oracle Linux, CentOS or Fedora platforms: `/var/log/mysqld.log` For SLES: `/var/log/mysql/mysqld.log`
Value of `secure_file_priv`	`/var/lib/mysql-files`
System V init script	For RHEL, Oracle Linux, CentOS or Fedora platforms: `/etc/init.d/mysqld` For SLES: `/etc/init.d/mysql`
Systemd service	For RHEL, Oracle Linux, CentOS or Fedora platforms: `mysqld` For SLES: `mysql`
Pid file	`/var/run/mysql/mysqld.pid`
Socket	`/var/lib/mysql/mysql.sock`
Keyring directory	`/var/lib/mysql-keyring`
Unix manual pages	`/usr/share/man`
Include (header) files	`/usr/include/mysql`
Libraries	`/usr/lib/mysql`
Miscellaneous support files (for example, error messages, and character set files)	`/usr/share/mysql`

The installation also creates a user named mysql and a group named mysql on the system.

Note

Installation of previous versions of MySQL using older packages might have created a configuration file named /usr/my.cnf. It is highly recommended that you examine the contents of the file and migrate the desired settings inside to the file /etc/my.cnf file, then remove /usr/my.cnf.

MySQL is NOT automatically started at the end of the installation process. For Red Hat Enterprise Linux, Oracle Linux, CentOS, and Fedora systems, use the following command to start MySQL:

shell> sudo service mysqld start

For SLES systems, the command is the same, but the service name is different:

shell> sudo service mysql start

If the operating system is systemd enabled, standard service commands such as stop, start, status and restart should be used to manage the MySQL server service. The mysqld service is enabled by default, and it starts at system reboot. Notice that certain things might work differently on systemd platforms: for example, changing the location of the data directory might cause issues. See Section 2.5.9, “Managing MySQL Server with systemd” for additional information.

At the initial start up of the server, the following happens, given that the data directory of the server is empty:

The server is initialized.
An SSL certificate and key files are generated in the data directory.
The validate_password plugin is installed and enabled.
A superuser account 'root'@'localhost' is created. A password for the superuser is set and stored in the error log file. To reveal it, use the following command for RHEL, Oracle Linux, CentOS, and Fedora systems:
```
shell> sudo grep 'temporary password' /var/log/mysqld.log
```
Use the following command for SLES systems:
```
shell> sudo grep 'temporary password' /var/log/mysql/mysqld.log
```
The next step is to log in with the generated, temporary password and set a custom password for the superuser account:

shell> mysql -uroot -p

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

Note

MySQL's validate_password plugin is installed by default. This will require that passwords contain at least one upper case letter, one lower case letter, one digit, and one special character, and that the total password length is at least 8 characters.

If something goes wrong during installation, you might find debug information in the error log file /var/log/mysqld.log.

For some Linux distributions, it might be necessary to increase the limit on number of file descriptors available to mysqld. See Section B.5.2.17, “File Not Found and Similar Errors”

Installing Client Libraries from Multiple MySQL Versions. It is possible to install multiple client library versions, such as for the case that you want to maintain compatibility with older applications linked against previous libraries. To install an older client library, use the --oldpackage option with rpm. For example, to install mysql-community-libs-5.5 on an EL6 system that has libmysqlclient.21 from MySQL 8.0, use a command like this:

shell> rpm --oldpackage -ivh mysql-community-libs-5.5.50-2.el6.x86_64.rpm

Debug Package. A special variant of MySQL Server compiled with the debug package has been included in the server RPM packages. It performs debugging and memory allocation checks and produces a trace file when the server is running. To use that debug version, start MySQL with /usr/sbin/mysqld-debug, instead of starting it as a service or with /usr/sbin/mysqld. See Section 28.5.3, “The DBUG Package” for the debug options you can use.

Rebuilding RPMs from source SRPMs. Source code SRPM packages for MySQL are available for download. They can be used as-is to rebuild the MySQL RPMs with the standard rpmbuild tool chain.

2.5.5 Installing MySQL on Linux Using Debian Packages from Oracle

Oracle provides Debian packages for installing MySQL on Debian or Debian-like Linux systems. The packages are available through two different channels:

The MySQL APT Repository. This is the preferred method for installing MySQL on Debian-like systems, as it provides a simple and convenient way to install and update MySQL products. For details, see Section 2.5.2, “Installing MySQL on Linux Using the MySQL APT Repository”.
The MySQL Developer Zone's Download Area. For details, see Section 2.1.2, “How to Get MySQL”. The following are some information on the Debian packages available there and the instructions for installing them:
- Various Debian packages are provided in the MySQL Developer Zone for installing different components of MySQL on different Debian or Ubuntu platforms (currently, Debian 8, and Ubuntu 14 and 16 are supported). The preferred method is to use the tarball bundle, which contains the packages needed for a basic setup of MySQL. The tarball bundles have names in the format of mysql-server_MVER-DVER_CPU.deb-bundle.tar. MVER is the MySQL version and DVER is the Linux distribution version. The CPU value indicates the processor type or family for which the package is built, as shown in the following table:
  
  Table 2.11 MySQL Debian and Ubuntu Installation Packages CPU Identifiers
  
  CPU Value Intended Processor Type or Family
  i386 Pentium processor or better, 32 bit
  amd64 64-bit x86 processor
- After downloading the tarball, unpack it with the following command:
```
shell> tar -xvf mysql-server_MVER-DVER_CPU.deb-bundle.tar
```
- You may need to install the libaio library if it is not already present on your system:
```
shell> sudo apt-get install libaio1
```
- Preconfigure the MySQL server package with the following command:
```
shell> sudo dpkg-preconfigure mysql-community-server_*.deb
```
  You will be asked to provide a password for the root user for your MySQL installation. You might also be asked other questions regarding the installation.
  
  Important
  
  Make sure you remember the root password you set. Users who want to set a password later can leave the password field blank in the dialogue box and just press OK; in that case, root access to the server is authenticated using the MySQL Socket Peer-Credential Authentication Plugin for connections using a Unix socket file. You can set the root password later using mysql_secure_installation.
- For a basic installation of the MySQL server, install the database common files package, the client package, the client metapackage, the server package, and the server metapackage (in that order); you can do that with a single command:
```
shell> sudo dpkg -i mysql-{common,community-client,client,community-server,server}_*.deb
```
  There are also packages with server-core and client-core in the package names. These contain binaries only and are installed automatically by the standard packages. Installing them by themselves will not result in a functioning MySQL setup.
  If you are being warned of unmet dependencies by dpkg, you can fix them using apt-get:
```
sudo apt-get -f install
```
  Here are where the files are installed on the system:
  - All configuration files (like my.cnf) are under /etc/mysql
  - All binaries, libraries, headers, etc., are under /usr/bin and /usr/sbin
  - The data directory is under /var/lib/mysql

`CPU` Value	Intended Processor Type or Family
`i386`	Pentium processor or better, 32 bit
`amd64`	64-bit x86 processor

Note

Debian distributions of MySQL are also provided by other vendors. Be aware that they may differ from those built by Oracle in features, capabilities, and conventions (including communication setup), and that the instructions in this manual do not necessarily apply to installing them. The vendor's instructions should be consulted instead.

2.5.6 Installing MySQL on Linux from the Native Software Repositories

Many Linux distributions include a version of the MySQL server, client tools, and development components in their native software repositories and can be installed with the platforms' standard package management systems. This section provides basic instructions for installing MySQL using those package management systems.

Important

Native packages are often several versions behind the currently available release. You will also normally be unable to install development milestone releases (DMRs), as these are not usually made available in the native repositories. Before proceeding, we recommend that you check out the other installation options described in Section 2.5, “Installing MySQL on Linux”.

Distribution specific instructions are shown below:

Red Hat Linux, Fedora, CentOS

Note

For a number of Linux distributions, you can install MySQL using the MySQL Yum repository instead of the platform's native software repository. See Section 2.5.1, “Installing MySQL on Linux Using the MySQL Yum Repository” for details.

For Red Hat and similar distributions, the MySQL distribution is divided into a number of separate packages, mysql for the client tools, mysql-server for the server and associated tools, and mysql-libs for the libraries. The libraries are required if you want to provide connectivity from different languages and environments such as Perl, Python and others.

To install, use the yum command to specify the packages that you want to install. For example:

root-shell> yum install mysql mysql-server mysql-libs mysql-server
Loaded plugins: presto, refresh-packagekit
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package mysql.x86_64 0:5.1.48-2.fc13 set to be updated
---> Package mysql-libs.x86_64 0:5.1.48-2.fc13 set to be updated
---> Package mysql-server.x86_64 0:5.1.48-2.fc13 set to be updated
--> Processing Dependency: perl-DBD-MySQL for package: mysql-server-5.1.48-2.fc13.x86_64
--> Running transaction check
---> Package perl-DBD-MySQL.x86_64 0:4.017-1.fc13 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package               Arch          Version               Repository      Size
================================================================================
Installing:
 mysql                 x86_64        5.1.48-2.fc13         updates        889 k
 mysql-libs            x86_64        5.1.48-2.fc13         updates        1.2 M
 mysql-server          x86_64        5.1.48-2.fc13         updates        8.1 M
Installing for dependencies:
 perl-DBD-MySQL        x86_64        4.017-1.fc13          updates        136 k

Transaction Summary
================================================================================
Install       4 Package(s)
Upgrade       0 Package(s)

Total download size: 10 M
Installed size: 30 M
Is this ok [y/N]: y
Downloading Packages:
Setting up and reading Presto delta metadata
Processing delta metadata
Package(s) data still to download: 10 M
(1/4): mysql-5.1.48-2.fc13.x86_64.rpm                    | 889 kB     00:04
(2/4): mysql-libs-5.1.48-2.fc13.x86_64.rpm               | 1.2 MB     00:06
(3/4): mysql-server-5.1.48-2.fc13.x86_64.rpm             | 8.1 MB     00:40
(4/4): perl-DBD-MySQL-4.017-1.fc13.x86_64.rpm            | 136 kB     00:00
--------------------------------------------------------------------------------
Total                                           201 kB/s |  10 MB     00:52
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : mysql-libs-5.1.48-2.fc13.x86_64                          1/4
  Installing     : mysql-5.1.48-2.fc13.x86_64                               2/4
  Installing     : perl-DBD-MySQL-4.017-1.fc13.x86_64                       3/4
  Installing     : mysql-server-5.1.48-2.fc13.x86_64                        4/4

Installed:
  mysql.x86_64 0:5.1.48-2.fc13            mysql-libs.x86_64 0:5.1.48-2.fc13
  mysql-server.x86_64 0:5.1.48-2.fc13

Dependency Installed:
  perl-DBD-MySQL.x86_64 0:4.017-1.fc13

Complete!

MySQL and the MySQL server should now be installed. A sample configuration file is installed into /etc/my.cnf. An init script, to start and stop the server, will have been installed into /etc/init.d/mysqld. To start the MySQL server use service:

root-shell> service mysqld start

To enable the server to be started and stopped automatically during boot, use chkconfig:

root-shell> chkconfig --levels 235 mysqld on

Which enables the MySQL server to be started (and stopped) automatically at the specified the run levels.

The database tables will have been automatically created for you, if they do not already exist. You should, however, run mysql_secure_installation to set the root passwords on your server.

Debian, Ubuntu, Kubuntu

Note

For Debian 8 and Ubuntu 14 and 16, MySQL can be installed using the MySQL APT Repository instead of the platform's native software repository. See Section 2.5.2, “Installing MySQL on Linux Using the MySQL APT Repository” for details.

On Debian and related distributions, there are two packages for MySQL in their software repositories, mysql-client and mysql-server, for the client and server components respectively. You should specify an explicit version, for example mysql-client-5.1, to ensure that you install the version of MySQL that you want.

To download and install, including any dependencies, use the apt-get command, specifying the packages that you want to install.

Note

Before installing, make sure that you update your apt-get index files to ensure you are downloading the latest available version.

A sample installation of the MySQL packages might look like this (some sections trimmed for clarity):

root-shell> apt-get install mysql-client-5.1 mysql-server-5.1
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-2.6.28-11 linux-headers-2.6.28-11-generic
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  bsd-mailx libdbd-mysql-perl libdbi-perl libhtml-template-perl
  libmysqlclient15off libmysqlclient16 libnet-daemon-perl libplrpc-perl mailx
  mysql-common postfix
Suggested packages:
  dbishell libipc-sharedcache-perl tinyca procmail postfix-mysql postfix-pgsql
  postfix-ldap postfix-pcre sasl2-bin resolvconf postfix-cdb
The following NEW packages will be installed
  bsd-mailx libdbd-mysql-perl libdbi-perl libhtml-template-perl
  libmysqlclient15off libmysqlclient16 libnet-daemon-perl libplrpc-perl mailx
  mysql-client-5.1 mysql-common mysql-server-5.1 postfix
0 upgraded, 13 newly installed, 0 to remove and 182 not upgraded.
Need to get 1907kB/25.3MB of archives.
After this operation, 59.5MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Get: 1 http://gb.archive.ubuntu.com jaunty-updates/main mysql-common 5.1.30really5.0.75-0ubuntu10.5 [63.6kB]
Get: 2 http://gb.archive.ubuntu.com jaunty-updates/main libmysqlclient15off 5.1.30really5.0.75-0ubuntu10.5 [1843kB]
Fetched 1907kB in 9s (205kB/s)
Preconfiguring packages ...
Selecting previously deselected package mysql-common.
(Reading database ... 121260 files and directories currently installed.)
...
Processing 1 added doc-base file(s)...
Registering documents with scrollkeeper...
Setting up libnet-daemon-perl (0.43-1) ...
Setting up libplrpc-perl (0.2020-1) ...
Setting up libdbi-perl (1.607-1) ...
Setting up libmysqlclient15off (5.1.30really5.0.75-0ubuntu10.5) ...

Setting up libdbd-mysql-perl (4.008-1) ...
Setting up libmysqlclient16 (5.1.31-1ubuntu2) ...

Setting up mysql-client-5.1 (5.1.31-1ubuntu2) ...

Setting up mysql-server-5.1 (5.1.31-1ubuntu2) ...
 * Stopping MySQL database server mysqld
   ...done.
2013-09-24T13:03:09.048353Z 0 [Note] InnoDB: 8.0.4 started; log sequence number 1566036
2013-09-24T13:03:10.057269Z 0 [Note] InnoDB: Starting shutdown...
2013-09-24T13:03:10.857032Z 0 [Note] InnoDB: Shutdown completed; log sequence number 1566036
 * Starting MySQL database server mysqld
   ...done.
 * Checking for corrupt, not cleanly closed and upgrade needing tables.
...
Processing triggers for libc6 ...
ldconfig deferred processing now taking place

Note

The apt-get command will install a number of packages, including the MySQL server, in order to provide the typical tools and application environment. This can mean that you install a large number of packages in addition to the main MySQL package.

During installation, the initial database will be created, and you will be prompted for the MySQL root password (and confirmation). A configuration file will have been created in /etc/mysql/my.cnf. An init script will have been created in /etc/init.d/mysql.

The server will already be started. You can manually start and stop the server using:

root-shell> service mysql [start|stop]

The service will automatically be added to the 2, 3 and 4 run levels, with stop scripts in the single, shutdown and restart levels.

2.5.7 Installing MySQL on Linux with Docker

The Docker deployment framework supports easy installation and configuration of MySQL servers. For instructions, see https://hub.docker.com/r/mysql/mysql-server/. This page also provides extensive documentation about using MySQL under Docker.

2.5.8 Installing MySQL on Linux with Juju

The Juju deployment framework supports easy installation and configuration of MySQL servers. For instructions, see https://jujucharms.com/mysql/.

2.5.9 Managing MySQL Server with systemd

If you install MySQL using an RPM or Debian package on the following Linux platforms, server startup and shutdown is managed by systemd:

RPM package platforms:
- Red Hat Enterprise Linux 7; Oracle Linux 7; CentOS 7
- SUSE Linux Enterprise Server 12
- Fedora 25 or 26
Debian package platforms:
- Debian 8 or higher
- Ubuntu 16 or higher

If you install MySQL from a source distribution on a platform that uses systemd, obtain systemd support for MySQL by configuring the distribution using the -DWITH_SYSTEMD=1 CMake option. See Section 2.8.4, “MySQL Source-Configuration Options”.

The following discussion covers these topics:

Note

On platforms for which systemd support for MySQL is installed, scripts such as mysqld_safe and the System V initialization script are unnecessary and are not installed. For example, mysqld_safe can handle server restarts, but systemd provides the same capability, and does so in a manner consistent with management of other services rather than by using an application-specific program.

Because systemd has the capability of managing multiple MySQL instances on platforms for which systemd support for MySQL is installed, mysqld_multi and mysqld_multi.server are unnecessary and are not installed.

Overview of systemd

systemd provides automatic MySQL server startup and shutdown. It also enables manual server management using the systemctl command. For example:

systemctl {start|stop|restart|status} mysqld

Alternatively, use the service command (with the arguments reversed), which is compatible with System V systems:

service mysqld {start|stop|restart|status}

Note

For the systemctl or service commands, if the MySQL service name is not mysqld, use the appropriate name. For example, use mysql rather than mysqld on Debian-based and SLES systems.

Support for systemd includes these files:

mysqld.service (RPM platforms), mysql.service (Debian platforms): systemd service unit configuration file, with details about the MySQL service.
mysqld@.service (RPM platforms), mysql@.service (Debian platforms): Like mysqld.service or mysql.service, but used for managing multiple MySQL instances.
mysqld.tmpfiles.d: File containing information to support the tmpfiles feature. This file is installed under the name mysql.conf.
mysqld_pre_systemd (RPM platforms), mysql-system-start (Debian platforms): Support script for the unit file. This script assists in creating the error log file only if the log location matches a pattern (/var/log/mysql*.log for RPM platforms, /var/log/mysql/*.log for Debian platforms). In other cases, the error log directory must be writable or the error log must be present and writable for the user running the mysqld process.

Configuring systemd for MySQL

To add or change systemd options for MySQL, these methods are available:

Use a localized systemd configuration file.
Arrange for systemd to set environment variables for the MySQL server process.
Set the MYSQLD_OPTS systemd variable.

To use a localized systemd configuration file, create the /etc/systemd/system/mysqld.service.d directory if it does not exist. In that directory, create a file that contains a [Service] section listing the desired settings. For example:

[Service]
LimitNOFILE=max_open_files
PIDFile=/path/to/pid/file
Nice=nice_level
LimitCore=core_file_limit
Environment="LD_PRELOAD=/path/to/malloc/library"
Environment="TZ=time_zone_setting"

The discussion here uses override.conf as the name of this file. Newer versions of systemd support the following command, which opens an editor and permits you to edit the file:

systemctl edit mysqld  # RPM platforms
systemctl edit mysql   # Debian platforms

Whenever you create or change override.conf, reload the systemd configuration, then tell systemd to restart the MySQL service:

systemctl daemon-reload
systemctl restart mysqld  # RPM platforms
systemctl restart mysql   # Debian platforms

With systemd, the override.conf configuration method must be used for certain parameters, rather than settings in a [mysqld] or [mysqld_safe] group in a MySQL option file:

For some parameters, override.conf must be used because systemd itself must know their values and it cannot read MySQL option files to get them.
Parameters that specify values otherwise settable only using options known to mysqld_safe must be specified using systemd because there is no corresponding mysqld parameter.

For additional information about using systemd rather than mysqld_safe, see Migrating from mysqld_safe to systemd.

You can set the following parameters in override.conf:

To specify the process ID file, use override.conf and change both PIDFile and ExecStart to name the PID file path name. Any setting of the process ID file in MySQL option files is ignored. To modify ExecStart, it must first be cleared. For example:
```
[Service]
PIDFile=/var/run/mysqld/mysqld-custom.pid
ExecStart=
ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld-custom.pid $MYSQLD_OPTS
```
To set the number of file descriptors available to the MySQL server, use LimitNOFILE in override.conf rather than the --open-files-limit option for mysqld or mysqld_safe.
To set the maximum core file size, use LimitCore in override.conf rather than the --core-file-size option for mysqld_safe.
To set the scheduling priority for the MySQL server, use Nice in override.conf rather than the --nice option for mysqld_safe.

Some MySQL parameters are configured using environment variables:

LD_PRELOAD: Set this variable if the MySQL server should use a specific memory-allocation library.
TZ: Set this variable to specify the default time zone for the server.

There are multiple ways to specify environment variable values for use by the MySQL server process managed by systemd:

Use Environment lines in the override.conf file. For the syntax, see the example in the preceding discussion that describes how to use this file.
Specify the values in the /etc/sysconfig/mysql file (create the file if it does not exist). Assign values using the following syntax:
```
LD_PRELOAD=/path/to/malloc/library
TZ=time_zone_setting
```
After modifying /etc/sysconfig/mysql, restart the server to make the changes effective:
```
systemctl restart mysqld  # RPM platforms
systemctl restart mysql   # Debian platforms
```

To specify options for mysqld without modifying systemd configuration files directly, set or unset the MYSQLD_OPTS systemd variable. For example:

systemctl set-environment MYSQLD_OPTS="--general_log=1"
systemctl unset-environment MYSQLD_OPTS

MYSQLD_OPTS can also be set in the /etc/sysconfig/mysql file.

After modifying the systemd environment, restart the server to make the changes effective:

systemctl restart mysqld  # RPM platforms
systemctl restart mysql   # Debian platforms

Configuring Multiple MySQL Instances Using systemd

This section describes how to configure systemd for multiple instances of MySQL.

Note

Because systemd has the capability of managing multiple MySQL instances on platforms for which systemd support is installed, mysqld_multi and mysqld_multi.server are unnecessary and are not installed.

To use multiple-instance capability, modify the my.cnf option file to include configuration of key options for each instance. These file locations are typical:

/etc/my.cnf or /etc/mysql/my.cnf (RPM platforms)
/etc/mysql/mysql.conf.d/mysqld.cnf (Debian platforms)

For example, to manage two instances named replica01 and replica02, add something like this to the option file:

RPM platforms:

[mysqld@replica01]
datadir=/var/lib/mysql-replica01
socket=/var/lib/mysql-replica01/mysql.sock
port=3307
log-error=/var/log/mysqld-replica01.log

[mysqld@replica02]
datadir=/var/lib/mysql-replica02
socket=/var/lib/mysql-replica02/mysql.sock
port=3308
log-error=/var/log/mysqld-replica02.log

Debian platforms:

[mysqld@replica01]
datadir=/var/lib/mysql-replica01
socket=/var/lib/mysql-replica01/mysql.sock
port=3307
log-error=/var/log/mysql/replica01.log

[mysqld@replica02]
datadir=/var/lib/mysql-replica02
socket=/var/lib/mysql-replica02/mysql.sock
port=3308
log-error=/var/log/mysql/replica02.log

The replica names shown here use @ as the delimiter because that is the only delimiter supported by systemd.

Instances then are managed by normal systemd commands, such as:

systemctl start mysqld@replica01
systemctl start mysqld@replica02

To enable instances to run at boot time, do this:

systemctl enable mysqld@replica01
systemctl enable mysqld@replica02

Use of wildcards is also supported. For example, this command displays the status of all replica instances:

systemctl status 'mysqld@replica*'

For management of multiple MySQL instances on the same machine, systemd automatically uses a different unit file:

mysqld@.service rather than mysqld.service (RPM platforms)
mysql@.service rather than mysql.service (Debian platforms)

In the unit file, %I and %i reference the parameter passed in after the @ marker and are used to manage the specific instance. For a command such as this:

systemctl start mysqld@replica01

systemd starts the server using a command such as this:

mysqld --defaults-group-suffix=@%I ...

The result is that the [server], [mysqld], and [mysqld@replica01] option groups are read and used for that instance of the service.

Note

On Debian platforms, AppArmor prevents the server from reading or writing /var/lib/mysql-replica*, or anything other than the default locations. To address this, you must customize or disable the profile in /etc/apparmor.d/user.sbin.mysqld.

Note

On Debian platforms, the packaging scripts for MySQL uninstallation cannot currently handle mysqld@ instances. Before removing or upgrading the package, you must stop any extra instances manually first.

Migrating from mysqld_safe to systemd

Because mysqld_safe is not installed on platforms that use systemd to manage MySQL, options previously specified for that program (for example, in an [mysqld_safe] option group) must be specified another way:

Some mysqld_safe options are also understood by mysqld and can be moved from the [mysqld_safe] option group to the [mysqld] group. This does not include --pid-file, --open-files-limit, or --nice. To specify those options, use the override.conf systemd file, described previously.
For some mysqld_safe options, there are alternative mysqld procedures. For example, the mysqld_safe option for enabling syslog logging is --syslog, which is deprecated. To write error log output to the system log, use the instructions at Error Logging to the System Log.
mysqld_safe options not understood by mysqld can be specified in override.conf or environment variables. For example, with mysqld_safe, if the server should use a specific memory allocation library, this is specified using the --malloc-lib option. For installations that manage the server with systemd, arrange to set the LD_PRELOAD environment variable instead, as described previously.

2.6 Installing MySQL on Solaris

2.6.1 Installing MySQL on Solaris Using a Solaris PKG

Note

MySQL 8.0 supports Solaris 11 (Update 3+ and later).

MySQL on Solaris is available in a number of different formats.

For information on installing using the native Solaris PKG format, see Section 2.6.1, “Installing MySQL on Solaris Using a Solaris PKG”.
To use a standard tar binary installation, use the notes provided in Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”. Check the notes and hints at the end of this section for Solaris specific notes that you may need before or after installation.

Important

The installation packages have a dependency on the Oracle Developer Studio 12.5 Runtime Libraries, which must be installed before you run the MySQL installation package. See the download options for Oracle Developer Studio here. The installation package enables you to install the runtime libraries only instead of the full Oracle Developer Studio; see instructions in Installing Only the Runtime Libraries on Oracle Solaris 11.

To obtain a binary MySQL distribution for Solaris in tarball or PKG format, http://dev.mysql.com/downloads/mysql/8.0.html.

Additional notes to be aware of when installing and using MySQL on Solaris:

If you want to use MySQL with the mysql user and group, use the groupadd and useradd commands:
```
groupadd mysql
useradd -g mysql -s /bin/false mysql
```
If you install MySQL using a binary tarball distribution on Solaris, because the Solaris tar cannot handle long file names, use GNU tar (gtar) to unpack the distribution. If you do not have GNU tar on your system, install it with the following command:
```
pkg install archiver/gnu-tar
```
You should mount any file systems on which you intend to store InnoDB files with the forcedirectio option. (By default mounting is done without this option.) Failing to do so will cause a significant drop in performance when using the InnoDB storage engine on this platform.
If you would like MySQL to start automatically, you can copy support-files/mysql.server to /etc/init.d and create a symbolic link to it named /etc/rc3.d/S99mysql.server.
If too many processes try to connect very rapidly to mysqld, you should see this error in the MySQL log:
```
Error in accept: Protocol error
```
You might try starting the server with the --back_log=50 option as a workaround for this.
To configure the generation of core files on Solaris you should use the coreadm command. Because of the security implications of generating a core on a setuid() application, by default, Solaris does not support core files on setuid() programs. However, you can modify this behavior using coreadm. If you enable setuid() core files for the current user, they will be generated using the mode 600 and owned by the superuser.

2.6.1 Installing MySQL on Solaris Using a Solaris PKG

You can install MySQL on Solaris using a binary package of the native Solaris PKG format instead of the binary tarball distribution.

Important

The installation package has a dependency on the Oracle Developer Studio 12.5 Runtime Libraries, which must be installed before you run the MySQL installation package. See the download options for Oracle Developer Studio here. The installation package enables you to install the runtime libraries only instead of the full Oracle Developer Studio; see instructions in Installing Only the Runtime Libraries on Oracle Solaris 11.

To use this package, download the corresponding mysql-VERSION-solaris11-PLATFORM.pkg.gz file, then uncompress it. For example:

shell> gunzip mysql-8.0.4-solaris11-x86_64.pkg.gz

To install a new package, use pkgadd and follow the onscreen prompts. You must have root privileges to perform this operation:

shell> pkgadd -d mysql-8.0.4-solaris11-x86_64.pkg

The following packages are available:
  1  mysql     MySQL Community Server (GPL)
               (i86pc) 8.0.4

Select package(s) you wish to process (or 'all' to process
all packages). (default: all) [?,??,q]:

The PKG installer installs all of the files and tools needed, and then initializes your database if one does not exist. To complete the installation, you should set the root password for MySQL as provided in the instructions at the end of the installation. Alternatively, you can run the mysql_secure_installation script that comes with the installation.

By default, the PKG package installs MySQL under the root path /opt/mysql. You can change only the installation root path when using pkgadd, which can be used to install MySQL in a different Solaris zone. If you need to install in a specific directory, use a binary tar file distribution.

The pkg installer copies a suitable startup script for MySQL into /etc/init.d/mysql. To enable MySQL to startup and shutdown automatically, you should create a link between this file and the init script directories. For example, to ensure safe startup and shutdown of MySQL you could use the following commands to add the right links:

shell> ln /etc/init.d/mysql /etc/rc3.d/S91mysql
shell> ln /etc/init.d/mysql /etc/rc0.d/K02mysql

To remove MySQL, the installed package name is mysql. You can use this in combination with the pkgrm command to remove the installation.

To upgrade when using the Solaris package file format, you must remove the existing installation before installing the updated package. Removal of the package does not delete the existing database information, only the server, binaries and support files. The typical upgrade sequence is therefore:

shell> mysqladmin shutdown
shell> pkgrm mysql
shell> pkgadd -d mysql-8.0.4-solaris11-x86_64.pkg
shell> mysqld_safe &
shell> mysql_upgrade

You should check the notes in Section 2.10, “Upgrading or Downgrading MySQL” before performing any upgrade.

2.7 Installing MySQL on FreeBSD

This section provides information about installing MySQL on variants of FreeBSD Unix.

You can install MySQL on FreeBSD by using the binary distribution provided by Oracle. For more information, see Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”.

The easiest (and preferred) way to install MySQL is to use the mysql-server and mysql-client ports available at http://www.freebsd.org/. Using these ports gives you the following benefits:

A working MySQL with all optimizations enabled that are known to work on your version of FreeBSD.
Automatic configuration and build.
Startup scripts installed in /usr/local/etc/rc.d.
The ability to use pkg_info -L to see which files are installed.
The ability to use pkg_delete to remove MySQL if you no longer want it on your machine.

The MySQL build process requires GNU make (gmake) to work. If GNU make is not available, you must install it first before compiling MySQL.

To install using the ports system:

# cd /usr/ports/databases/mysql80-server
# make
...
# cd /usr/ports/databases/mysql80-client
# make
...

The standard port installation places the server into /usr/local/libexec/mysqld, with the startup script for the MySQL server placed in /usr/local/etc/rc.d/mysql-server.

Some additional notes on the BSD implementation:

To remove MySQL after installation using the ports system:

# cd /usr/ports/databases/mysql80-server
# make deinstall
...
# cd /usr/ports/databases/mysql80-client
# make deinstall
...

If you get problems with the current date in MySQL, setting the TZ variable should help. See Section 4.9, “MySQL Program Environment Variables”.

2.8 Installing MySQL from Source

2.8.1 MySQL Layout for Source Installation
2.8.2 Installing MySQL Using a Standard Source Distribution
2.8.3 Installing MySQL Using a Development Source Tree
2.8.4 MySQL Source-Configuration Options
2.8.5 Dealing with Problems Compiling MySQL
2.8.6 MySQL Configuration and Third-Party Tools
2.8.7 Generating MySQL Doxygen Documentation Content

Building MySQL from the source code enables you to customize build parameters, compiler optimizations, and installation location. For a list of systems on which MySQL is known to run, see http://www.mysql.com/support/supportedplatforms/database.html.

Before you proceed with an installation from source, check whether Oracle produces a precompiled binary distribution for your platform and whether it works for you. We put a great deal of effort into ensuring that our binaries are built with the best possible options for optimal performance. Instructions for installing binary distributions are available in Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”.

Warning

Building MySQL with nonstandard options may lead to reduced functionality, performance, or security.

The MySQL source code contains internal documentation written using Doxygen. The generated Doxygen content is available at http://dev.mysql.com/doc/dev/mysql-server/latest/. It is also possible to generate this content locally from a MySQL source distribution using the instructions at Section 2.8.7, “Generating MySQL Doxygen Documentation Content”.

Source Installation Methods

There are two methods for installing MySQL from source:

Use a standard MySQL source distribution. To obtain a standard distribution, see Section 2.1.2, “How to Get MySQL”. For instructions on building from a standard distribution, see Section 2.8.2, “Installing MySQL Using a Standard Source Distribution”.
Standard distributions are available as compressed tar files, Zip archives, or RPM packages. Distribution files have names of the form mysql-VERSION.tar.gz, mysql-VERSION.zip, or mysql-VERSION.rpm, where VERSION is a number like 8.0.4. File names for source distributions can be distinguished from those for precompiled binary distributions in that source distribution names are generic and include no platform name, whereas binary distribution names include a platform name indicating the type of system for which the distribution is intended (for example, pc-linux-i686 or winx64).
Use a MySQL development tree. For information on building from one of the development trees, see Section 2.8.3, “Installing MySQL Using a Development Source Tree”.

Source Installation System Requirements

Installation of MySQL from source requires several development tools. Some of these tools are needed no matter whether you use a standard source distribution or a development source tree. Other tool requirements depend on which installation method you use.

To install MySQL from source, the following system requirements must be satisfied, regardless of installation method:

CMake, which is used as the build framework on all platforms. CMake can be downloaded from http://www.cmake.org.
A good make program. Although some platforms come with their own make implementations, it is highly recommended that you use GNU make 3.75 or higher. It may already be available on your system as gmake. GNU make is available from http://www.gnu.org/software/make/.
MySQL 8.0 source code permits use of C++11 features. To enable a good level of C++11 support across all supported platforms, the following minimum compiler versions apply:
- GCC: 4.8 or higher
- Clang: 3.4 or higher (Xcode 7 on macOS)
- Solaris Studio: 12.4 or higher (Solaris client build only)
- Visual Studio: 2015
- CMake: On Windows, the required Visual Studio version results in a required CMake version of 3.2.3 or higher
The Boost C++ libraries are required to build MySQL (but not to use it). The current version of Boost must be installed. To obtain Boost and its installation instructions, visit the official site. After Boost is installed, tell the build system where the Boost files are located by defining the WITH_BOOST option when you invoke CMake. For example:
```
shell> cmake . -DWITH_BOOST=/usr/local/boost_1_60_0
```
Adjust the path as necessary to match your installation.
Sufficient free memory. If you encounter problems such as “internal compiler error” when compiling large source files, it may be that you have too little memory. If compiling on a virtual machine, try increasing the memory allocation.
Perl is needed if you intend to run test scripts. Most Unix-like systems include Perl. On Windows, you can use a version such as ActiveState Perl.

To install MySQL from a standard source distribution, one of the following tools is required to unpack the distribution file:

For a .tar.gz compressed tar file: GNU gunzip to uncompress the distribution and a reasonable tar to unpack it. If your tar program supports the z option, it can both uncompress and unpack the file.
GNU tar is known to work. The standard tar provided with some operating systems is not able to unpack the long file names in the MySQL distribution. You should download and install GNU tar, or if available, use a preinstalled version of GNU tar. Usually this is available as gnutar, gtar, or as tar within a GNU or Free Software directory, such as /usr/sfw/bin or /usr/local/bin. GNU tar is available from http://www.gnu.org/software/tar/.
For a .zip Zip archive: WinZip or another tool that can read .zip files.
For an .rpm RPM package: The rpmbuild program used to build the distribution unpacks it.

To install MySQL from a development source tree, the following additional tools are required:

The Git revision control system is required to obtain the development source code. The GitHub Help provides instructions for downloading and installing Git on different platforms. MySQL officially joined GitHub in September, 2014. For more information about MySQL's move to GitHub, refer to the announcement on the MySQL Release Engineering blog: MySQL on GitHub
bison 2.1 or higher, available from http://www.gnu.org/software/bison/. (Version 1 is no longer supported.) Use the latest version of bison where possible; if you experience problems, upgrade to a later version, rather than revert to an earlier one.
bison is available from http://www.gnu.org/software/bison/. bison for Windows can be downloaded from http://gnuwin32.sourceforge.net/packages/bison.htm. Download the package labeled “Complete package, excluding sources”. On Windows, the default location for bison is the C:\Program Files\GnuWin32 directory. Some utilities may fail to find bison because of the space in the directory name. Also, Visual Studio may simply hang if there are spaces in the path. You can resolve these problems by installing into a directory that does not contain a space; for example C:\GnuWin32.
On Solaris Express, m4 must be installed in addition to bison. m4 is available from http://www.gnu.org/software/m4/.

Note

If you have to install any programs, modify your PATH environment variable to include any directories in which the programs are located. See Section 4.2.10, “Setting Environment Variables”.

If you run into problems and need to file a bug report, please use the instructions in Section 1.7, “How to Report Bugs or Problems”.

2.8.1 MySQL Layout for Source Installation

By default, when you install MySQL after compiling it from source, the installation step installs files under /usr/local/mysql. The component locations under the installation directory are the same as for binary distributions. See Table 2.3, “MySQL Installation Layout for Generic Unix/Linux Binary Package”, and Section 2.3.1, “MySQL Installation Layout on Microsoft Windows”. To configure installation locations different from the defaults, use the options described at Section 2.8.4, “MySQL Source-Configuration Options”.

2.8.2 Installing MySQL Using a Standard Source Distribution

To install MySQL from a standard source distribution:

Verify that your system satisfies the tool requirements listed at Section 2.8, “Installing MySQL from Source”.
Obtain a distribution file using the instructions in Section 2.1.2, “How to Get MySQL”.
Configure, build, and install the distribution using the instructions in this section.
Perform postinstallation procedures using the instructions in Section 2.9, “Postinstallation Setup and Testing”.

In MySQL 8.0, CMake is used as the build framework on all platforms. The instructions given here should enable you to produce a working installation. For additional information on using CMake to build MySQL, see How to Build MySQL Server with CMake.

If you start from a source RPM, use the following command to make a binary RPM that you can install. If you do not have rpmbuild, use rpm instead.

shell> rpmbuild --rebuild --clean MySQL-VERSION.src.rpm

The result is one or more binary RPM packages that you install as indicated in Section 2.5.4, “Installing MySQL on Linux Using RPM Packages from Oracle”.

The sequence for installation from a compressed tar file or Zip archive source distribution is similar to the process for installing from a generic binary distribution (see Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”), except that it is used on all platforms and includes steps to configure and compile the distribution. For example, with a compressed tar file source distribution on Unix, the basic installation command sequence looks like this:

# Preconfiguration setup
shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql
# Beginning of source-build specific instructions
shell> tar zxvf mysql-VERSION.tar.gz
shell> cd mysql-VERSION
shell> mkdir bld
shell> cd bld
shell> cmake ..
shell> make
shell> make install
# End of source-build specific instructions
# Postinstallation setup
shell> cd /usr/local/mysql
shell> chown -R mysql .
shell> chgrp -R mysql .
shell> bin/mysqld --initialize --user=mysql
shell> bin/mysql_ssl_rsa_setup
shell> chown -R root .
shell> chown -R mysql data
shell> bin/mysqld_safe --user=mysql &
# Next command is optional
shell> cp support-files/mysql.server /etc/init.d/mysql.server

A more detailed version of the source-build specific instructions is shown following.

Note

The procedure shown here does not set up any passwords for MySQL accounts. After following the procedure, proceed to Section 2.9, “Postinstallation Setup and Testing”, for postinstallation setup and testing.

Perform Preconfiguration Setup

On Unix, set up the mysql user and group that will be used to run and execute the MySQL server and own the database directory. For details, see Creating a mysql System User and Group, in Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”. Then perform the following steps as the mysql user, except as noted.

Obtain and Unpack the Distribution

Pick the directory under which you want to unpack the distribution and change location into it.

Obtain a distribution file using the instructions in Section 2.1.2, “How to Get MySQL”.

Unpack the distribution into the current directory:

To unpack a compressed tar file, tar can uncompress and unpack the distribution if it has z option support:
```
shell> tar zxvf mysql-VERSION.tar.gz
```
If your tar does not have z option support, use gunzip to unpack the distribution and tar to unpack it:
```
shell> gunzip < mysql-VERSION.tar.gz | tar xvf -
```
Alternatively, CMake can uncompress and unpack the distribution:
```
shell> cmake -E tar zxvf mysql-VERSION.tar.gz
```
To unpack a Zip archive, use WinZip or another tool that can read .zip files.

Unpacking the distribution file creates a directory named mysql-VERSION.

Configure the Distribution

Change location into the top-level directory of the unpacked distribution:

shell> cd mysql-VERSION

Build out of the source tree to keep the tree clean. If the top-level source directory is named mysql-src under your current working directory, you can build in a directory named bld at the same level. Create the directory and go there:

shell> mkdir bld
shell> cd bld

Configure the build directory. The minimum configuration command includes no options to override configuration defaults:

shell> cmake ../mysql-src

The build directory needs not be outside the source tree. For example, you can build in a directory named bld under the top-level source tree. To do this, starting with mysql-src as your current working directory, create the directory bld and then go there:

shell> mkdir bld
shell> cd bld

Configure the build directory. The minimum configuration command includes no options to override configuration defaults:

shell> cmake ..

If you have multiple source trees at the same level (for example, to build multiple versions of MySQL), the second strategy can be advantageous. The first strategy places all build directories at the same level, which requires that you choose a unique name for each. With the second strategy, you can use the same name for the build directory within each source tree. The following instructions assume this second strategy.

On Windows, specify the development environment. For example, the following commands configure MySQL for 32-bit or 64-bit builds, respectively:

shell> cmake .. -G "Visual Studio 12 2013"
shell> cmake .. -G "Visual Studio 12 2013 Win64"

On macOS, to use the Xcode IDE:

shell> cmake .. -G Xcode

When you run cmake, you might want to add options to the command line. Here are some examples:

-DBUILD_CONFIG=mysql_release: Configure the source with the same build options used by Oracle to produce binary distributions for official MySQL releases.
-DCMAKE_INSTALL_PREFIX=dir_name: Configure the distribution for installation under a particular location.
-DCPACK_MONOLITHIC_INSTALL=1: Cause make package to generate a single installation file rather than multiple files.
-DWITH_DEBUG=1: Build the distribution with debugging support.

For a more extensive list of options, see Section 2.8.4, “MySQL Source-Configuration Options”.

To list the configuration options, use one of the following commands:

shell> cmake .. -L   # overview
shell> cmake .. -LH  # overview with help text
shell> cmake .. -LAH # all params with help text
shell> ccmake ..     # interactive display

If CMake fails, you might need to reconfigure by running it again with different options. If you do reconfigure, take note of the following:

If CMake is run after it has previously been run, it may use information that was gathered during its previous invocation. This information is stored in CMakeCache.txt. When CMake starts up, it looks for that file and reads its contents if it exists, on the assumption that the information is still correct. That assumption is invalid when you reconfigure.
Each time you run CMake, you must run make again to recompile. However, you may want to remove old object files from previous builds first because they were compiled using different configuration options.

To prevent old object files or configuration information from being used, run these commands in the build direcotry on Unix before re-running CMake:

shell> make clean
shell> rm CMakeCache.txt

Or, on Windows:

shell> devenv MySQL.sln /clean
shell> del CMakeCache.txt

If you are going to send mail to a MySQL mailing list to ask for configuration assistance, first check the files in the CMakeFiles directory for useful information about the failure. To file a bug report, please use the instructions in Section 1.7, “How to Report Bugs or Problems”.

Build the Distribution

On Unix:

shell> make
shell> make VERBOSE=1

The second command sets VERBOSE to show the commands for each compiled source.

Use gmake instead on systems where you are using GNU make and it has been installed as gmake.

On Windows:

shell> devenv MySQL.sln /build RelWithDebInfo

If you have gotten to the compilation stage, but the distribution does not build, see Section 2.8.5, “Dealing with Problems Compiling MySQL”, for help. If that does not solve the problem, please enter it into our bugs database using the instructions given in Section 1.7, “How to Report Bugs or Problems”. If you have installed the latest versions of the required tools, and they crash trying to process our configuration files, please report that also. However, if you get a command not found error or a similar problem for required tools, do not report it. Instead, make sure that all the required tools are installed and that your PATH variable is set correctly so that your shell can find them.

Install the Distribution

On Unix:

shell> make install

This installs the files under the configured installation directory (by default, /usr/local/mysql). You might need to run the command as root.

To install in a specific directory, add a DESTDIR parameter to the command line:

shell> make install DESTDIR="/opt/mysql"

Alternatively, generate installation package files that you can install where you like:

shell> make package

This operation produces one or more .tar.gz files that can be installed like generic binary distribution packages. See Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”. If you run CMake with -DCPACK_MONOLITHIC_INSTALL=1, the operation produces a single file. Otherwise, it produces multiple files.

On Windows, generate the data directory, then create a .zip archive installation package:

shell> devenv MySQL.sln /build RelWithDebInfo /project initial_database
shell> devenv MySQL.sln /build RelWithDebInfo /project package

You can install the resulting .zip archive where you like. See Section 2.3.5, “Installing MySQL on Microsoft Windows Using a noinstall Zip Archive”.

Perform Postinstallation Setup

The remainder of the installation process involves setting up the configuration file, creating the core databases, and starting the MySQL server. For instructions, see Section 2.9, “Postinstallation Setup and Testing”.

Note

The accounts that are listed in the MySQL grant tables initially have no passwords. After starting the server, you should set up passwords for them using the instructions in Section 2.9, “Postinstallation Setup and Testing”.

2.8.3 Installing MySQL Using a Development Source Tree

This section describes how to install MySQL from the latest development source code, which is hosted on GitHub. To obtain the MySQL Server source code from this repository hosting service, you can set up a local MySQL Git repository.

On GitHub, MySQL Server and other MySQL projects are found on the MySQL page. The MySQL Server project is a single repository that contains branches for several MySQL series.

MySQL officially joined GitHub in September, 2014. For more information about MySQL's move to GitHub, refer to the announcement on the MySQL Release Engineering blog: MySQL on GitHub

Prerequisites for Installing from Development Source

To install MySQL from a development source tree, your system must satisfy the tool requirements outlined in Section 2.8, “Installing MySQL from Source”.

Setting Up a MySQL Git Repository

To set up a MySQL Git repository on your machine, use this procedure:

Clone the MySQL Git repository to your machine. The following command clones the MySQL Git repository to a directory named mysql-server. The initial download will take some time to complete, depending on the speed of your connection.

~$ git clone https://github.com/mysql/mysql-server.git
Cloning into 'mysql-server'...
remote: Counting objects: 1198513, done.
remote: Total 1198513 (delta 0), reused 0 (delta 0), pack-reused 1198513
Receiving objects: 100% (1198513/1198513), 1.01 GiB | 7.44 MiB/s, done.
Resolving deltas: 100% (993200/993200), done.
Checking connectivity... done.
Checking out files: 100% (25510/25510), done.

When the clone operation completes, the contents of your local MySQL Git repository appear similar to the following:

~$ cd mysql-server
~/mysql-server$ ls
BUILD                cmd-line-utils       libservices          sql
CMakeLists.txt       config.h.cmake       man                  sql-common
COPYING              configure.cmake      mysql-test           storage
Docs                 dbug                 mysys                strings
Doxyfile-perfschema  extra                mysys_ssl            support-files
INSTALL              include              packaging            testclients
README               libbinlogevents      plugin               unittest
VERSION              libbinlogstandalone  rapid                vio
client               libevent             regex                win
cmake                libmysql             scripts              zlib

Use the git branch -r command to view the remote tracking branches for the MySQL repository.

~/mysql-server$ git branch -r
  origin/5.5
  origin/5.6
  origin/5.7
  origin/8.0
  origin/HEAD -> origin/5.7
  origin/cluster-7.2
  origin/cluster-7.3
  origin/cluster-7.4
  origin/cluster-7.5

To view the branches that are checked out in your local repository, issue the git branch command. When you cloned the MySQL Git repository, the MySQL 5.7 branch was checked out automatically. The asterisk identifies the 5.7 branch as the active branch.
```
~/mysql-server$ git branch
* 5.7
```

To check out a different MySQL branch, run the git checkout command, specifying the branch name. For example, to checkout the MySQL 8.0 branch:

~/mysql-server$ git checkout 8.0
Checking out files: 100% (9600/9600), done.
Branch 8.0 set up to track remote branch 8.0 from origin.
Switched to a new branch '8.0'

Run git branch to verify that the MySQL 8.0 branch is present. MySQL 8.0, which is the last branch you checked out, is marked by an asterisk indicating that it is the active branch.
```
~/mysql-server$ git branch
  5.7
* 8.0
```
Use the git checkout command to switch between branches. For example:
```
~/mysql-server$ git checkout 5.7
```
To obtain changes made after your initial setup of the MySQL Git repository, switch to the branch you want to update and issue the git pull command:
```
~/mysql-server$ git checkout 8.0
~/mysql-server$ git pull
```
To examine the commit history, use the git log option:
```
~/mysql-server$ git log
```
You can also browse commit history and source code on the GitHub MySQL site.
If you see changes or code that you have a question about, send an email to the MySQL internals mailing list. See Section 1.6.2, “MySQL Mailing Lists”. For information about contributing a patch, see Contributing to MySQL Server.
After you have cloned the MySQL Git repository and have checked out the branch you want to build, you can build MySQL Server from the source code. Instructions are provided in Section 2.8.2, “Installing MySQL Using a Standard Source Distribution”, except that you skip the part about obtaining and unpacking the distribution.
Be careful about installing a build from a distribution source tree on a production machine. The installation command may overwrite your live release installation. If you already have MySQL installed and do not want to overwrite it, run CMake with values for the CMAKE_INSTALL_PREFIX, MYSQL_TCP_PORT, and MYSQL_UNIX_ADDR options different from those used by your production server. For additional information about preventing multiple servers from interfering with each other, see Section 5.7, “Running Multiple MySQL Instances on One Machine”.
Play hard with your new installation. For example, try to make new features crash. Start by running make test. See Section 28.1.2, “The MySQL Test Suite”.

2.8.4 MySQL Source-Configuration Options

The CMake program provides a great deal of control over how you configure a MySQL source distribution. Typically, you do this using options on the CMake command line. For information about options supported by CMake, run either of these commands in the top-level source directory:

shell> cmake . -LH
shell> ccmake .

You can also affect CMake using certain environment variables. See Section 4.9, “MySQL Program Environment Variables”.

The following table shows the available CMake options. In the Default column, PREFIX stands for the value of the CMAKE_INSTALL_PREFIX option, which specifies the installation base directory. This value is used as the parent location for several of the installation subdirectories.

Table 2.12 MySQL Source-Configuration Option Reference (CMake)

Formats	Description	Default	Introduced	Removed
`BUILD_CONFIG`	Use same build options as official releases
`CMAKE_BUILD_TYPE`	Type of build to produce	`RelWithDebInfo`
`CMAKE_CXX_FLAGS`	Flags for C++ Compiler
`CMAKE_C_FLAGS`	Flags for C Compiler
`CMAKE_INSTALL_PREFIX`	Installation base directory	`/usr/local/mysql`
`COMPILATION_COMMENT`	Comment about compilation environment
`CPACK_MONOLITHIC_INSTALL`	Whether package build produces single file	`OFF`
`DEFAULT_CHARSET`	The default server character set	`utf8mb4`
`DEFAULT_COLLATION`	The default server collation	`utf8mb4_0900_ai_ci`
`DISABLE_PSI_COND`	Exclude Performance Schema condition instrumentation	`OFF`
`DISABLE_PSI_FILE`	Exclude Performance Schema file instrumentation	`OFF`
`DISABLE_PSI_IDLE`	Exclude Performance Schema idle instrumentation	`OFF`
`DISABLE_PSI_MEMORY`	Exclude Performance Schema memory instrumentation	`OFF`
`DISABLE_PSI_METADATA`	Exclude Performance Schema metadata instrumentation	`OFF`
`DISABLE_PSI_MUTEX`	Exclude Performance Schema mutex instrumentation	`OFF`
`DISABLE_PSI_RWLOCK`	Exclude Performance Schema rwlock instrumentation	`OFF`
`DISABLE_PSI_SOCKET`	Exclude Performance Schema socket instrumentation	`OFF`
`DISABLE_PSI_SP`	Exclude Performance Schema stored program instrumentation	`OFF`
`DISABLE_PSI_STAGE`	Exclude Performance Schema stage instrumentation	`OFF`
`DISABLE_PSI_STATEMENT`	Exclude Performance Schema statement instrumentation	`OFF`
`DISABLE_PSI_STATEMENT_DIGEST`	Exclude Performance Schema statements_digest instrumentation	`OFF`
`DISABLE_PSI_TABLE`	Exclude Performance Schema table instrumentation	`OFF`
`DISABLE_SHARED`	Do not build shared libraries, compile position-dependent code	`OFF`
`DOWNLOAD_BOOST`	Whether to download the Boost library	`OFF`
`DOWNLOAD_BOOST_TIMEOUT`	Timeout in seconds for downloading the Boost library	`600`
`ENABLED_LOCAL_INFILE`	Whether to enable LOCAL for LOAD DATA INFILE	`OFF`
`ENABLED_PROFILING`	Whether to enable query profiling code	`ON`
`ENABLE_DEBUG_SYNC`	Whether to enable Debug Sync support	`ON`		8.0.1
`ENABLE_DOWNLOADS`	Whether to download optional files	`OFF`
`ENABLE_DTRACE`	Whether to include DTrace support			8.0.1
`ENABLE_GCOV`	Whether to include gcov support
`ENABLE_GPROF`	Enable gprof (optimized Linux builds only)	`OFF`
`FORCE_UNSUPPORTED_COMPILER`	Whether to permit unsupported compiler	`OFF`
`IGNORE_AIO_CHECK`	With -DBUILD_CONFIG=mysql_release, ignore libaio check	`OFF`
`INSTALL_BINDIR`	User executables directory	`PREFIX/bin`
`INSTALL_DOCDIR`	Documentation directory	`PREFIX/docs`
`INSTALL_DOCREADMEDIR`	README file directory	`PREFIX`
`INSTALL_INCLUDEDIR`	Header file directory	`PREFIX/include`
`INSTALL_INFODIR`	Info file directory	`PREFIX/docs`
`INSTALL_LAYOUT`	Select predefined installation layout	`STANDALONE`
`INSTALL_LIBDIR`	Library file directory	`PREFIX/lib`
`INSTALL_MANDIR`	Manual page directory	`PREFIX/man`
`INSTALL_MYSQLKEYRINGDIR`	Directory for keyring_file plugin data file	`platform specific`
`INSTALL_MYSQLSHAREDIR`	Shared data directory	`PREFIX/share`
`INSTALL_MYSQLTESTDIR`	mysql-test directory	`PREFIX/mysql-test`
`INSTALL_PKGCONFIGDIR`	Directory for mysqlclient.pc pkg-config file	`INSTALL_LIBDIR/pkgconfig`
`INSTALL_PLUGINDIR`	Plugin directory	`PREFIX/lib/plugin`
`INSTALL_SBINDIR`	Server executable directory	`PREFIX/bin`
`INSTALL_SECURE_FILE_PRIVDIR`	secure_file_priv default value	`platform specific`
`INSTALL_SHAREDIR`	aclocal/mysql.m4 installation directory	`PREFIX/share`
`INSTALL_STATIC_LIBRARIES`	Whether to install static libraries	`ON`
`INSTALL_SUPPORTFILESDIR`	Extra support files directory	`PREFIX/support-files`
`LINK_RANDOMIZE`	Whether to randomize order of symbols in mysqld binary	`OFF`	8.0.1
`LINK_RANDOMIZE_SEED`	Seed value for LINK_RANDOMIZE option	`mysql`	8.0.1
`MAX_INDEXES`	Maximum indexes per table	`64`
`MUTEX_TYPE`	InnoDB mutex type	`event`
`MYSQLX_TCP_PORT`	TCP/IP port number used by X Plugin	`33060`
`MYSQLX_UNIX_ADDR`	Unix socket file used by X Plugin	`/tmp/mysqlx.sock`
`MYSQL_DATADIR`	Data directory
`MYSQL_MAINTAINER_MODE`	Whether to enable MySQL maintainer-specific development environment	`OFF`
`MYSQL_PROJECT_NAME`	Windows/OS X project name	`MySQL`
`MYSQL_TCP_PORT`	TCP/IP port number	`3306`
`MYSQL_UNIX_ADDR`	Unix socket file	`/tmp/mysql.sock`
`ODBC_INCLUDES`	ODBC includes directory
`ODBC_LIB_DIR`	ODBC library directory
`OPTIMIZER_TRACE`	Whether to support optimizer tracing
`SYSCONFDIR`	Option file directory
`SYSTEMD_PID_DIR`	Directory for PID file under systemd	`/var/run/mysqld`
`SYSTEMD_SERVICE_NAME`	Name of MySQL service under systemd	`mysqld`
`TMPDIR`	tmpdir default value
`USE_LD_GOLD`	Whether to use GNU gold loader	`ON`	8.0.0
`WIN_DEBUG_NO_INLINE`	Whether to disable function inlining	`OFF`
`WITHOUT_SERVER`	Do not build the server	`OFF`
`WITHOUT_xxx_STORAGE_ENGINE`	Exclude storage engine xxx from build
`WITH_ASAN`	Enable AddressSanitizer	`OFF`
`WITH_AUTHENTICATION_LDAP`	Whether to report error if LDAP authentication plugins cannot be built	`OFF`	8.0.2
`WITH_AUTHENTICATION_PAM`	Build PAM authentication plugin	`OFF`
`WITH_BOOST`	The location of the Boost library sources
`WITH_CLIENT_PROTOCOL_TRACING`	Build client-side protocol tracing framework	`ON`
`WITH_DEBUG`	Whether to include debugging support	`OFF`
`WITH_DEFAULT_COMPILER_OPTIONS`	Whether to use default compiler options	`ON`
`WITH_DEFAULT_FEATURE_SET`	Whether to use default feature set	`ON`
`WITH_EDITLINE`	Which libedit/editline library to use	`bundled`
`WITH_INNODB_EXTRA_DEBUG`	Whether to include extra debugging support for InnoDB.	`OFF`
`WITH_INNODB_MEMCACHED`	Whether to generate memcached shared libraries.	`OFF`
`WITH_KEYRING_TEST`	Build the keyring test program	`OFF`
`WITH_LIBEVENT`	Which libevent library to use	`bundled`
`WITH_LIBWRAP`	Whether to include libwrap (TCP wrappers) support	`OFF`
`WITH_LZ4`	Type of LZ4 support	`bundled`
`WITH_MECAB`	Compiles MeCab
`WITH_MSAN`	Enable MemorySanitizer	`OFF`
`WITH_MSCRT_DEBUG`	Enable Visual Studio CRT memory leak tracing	`OFF`
`WITH_NUMA`	Set NUMA memory allocation policy
`WITH_PROTOBUF`	Which Protocol Buffers package to use	`bundled`
`WITH_RAPID`	Whether to build rapid development cycle plugins	`ON`
`WITH_SSL`	Type of SSL support	`bundled`
`WITH_SYSTEMD`	Enable installation of systemd support files	`OFF`
`WITH_TEST_TRACE_PLUGIN`	Build test protocol trace plugin	`OFF`
`WITH_TSAN`	Enable ThreadSanitizer	`OFF`
`WITH_UBSAN`	Enable Undefined Behavior Sanitizer	`OFF`
`WITH_UNIT_TESTS`	Compile MySQL with unit tests	`ON`
`WITH_UNIXODBC`	Enable unixODBC support	`OFF`
`WITH_VALGRIND`	Whether to compile in Valgrind header files	`OFF`
`WITH_ZLIB`	Type of zlib support	`bundled`
`WITH_xxx_STORAGE_ENGINE`	Compile storage engine xxx statically into server

The following sections provide more information about CMake options.

For boolean options, the value may be specified as 1 or ON to enable the option, or as 0 or OFF to disable the option.

Many options configure compile-time defaults that can be overridden at server startup. For example, the CMAKE_INSTALL_PREFIX, MYSQL_TCP_PORT, and MYSQL_UNIX_ADDR options that configure the default installation base directory location, TCP/IP port number, and Unix socket file can be changed at server startup with the --basedir, --port, and --socket options for mysqld. Where applicable, configuration option descriptions indicate the corresponding mysqld startup option.

General Options

-DBUILD_CONFIG=mysql_release
This option configures a source distribution with the same build options used by Oracle to produce binary distributions for official MySQL releases.
-DCMAKE_BUILD_TYPE=type
The type of build to produce:
- RelWithDebInfo: Enable optimizations and generate debugging information. This is the default MySQL build type.
- Debug: Disable optimizations and generate debugging information. This build type is also used if the WITH_DEBUG option is enabled. That is, -DWITH_DEBUG=1 has the same effect as -DCMAKE_BUILD_TYPE=Debug.
-DCPACK_MONOLITHIC_INSTALL=bool
This option affects whether the make package operation produces multiple installation package files or a single file. If disabled, the operation produces multiple installation package files, which may be useful if you want to install only a subset of a full MySQL installation. If enabled, it produces a single file for installing everything.

Installation Layout Options

The CMAKE_INSTALL_PREFIX option indicates the base installation directory. Other options with names of the form INSTALL_xxx that indicate component locations are interpreted relative to the prefix and their values are relative pathnames. Their values should not include the prefix.

-DCMAKE_INSTALL_PREFIX=dir_name
The installation base directory.
This value can be set at server startup with the --basedir option.
-DINSTALL_BINDIR=dir_name
Where to install user programs.
-DINSTALL_DOCDIR=dir_name
Where to install documentation.
-DINSTALL_DOCREADMEDIR=dir_name
Where to install README files.
-DINSTALL_INCLUDEDIR=dir_name
Where to install header files.
-DINSTALL_INFODIR=dir_name
Where to install Info files.
-DINSTALL_LAYOUT=name
Select a predefined installation layout:
- STANDALONE: Same layout as used for .tar.gz and .zip packages. This is the default.
- RPM: Layout similar to RPM packages.
- SVR4: Solaris package layout.
- DEB: DEB package layout (experimental).
You can select a predefined layout but modify individual component installation locations by specifying other options. For example:
```
shell> cmake . -DINSTALL_LAYOUT=SVR4 -DMYSQL_DATADIR=/var/mysql/data
```
The INSTALL_LAYOUT value determines the default value of the secure_file_priv system and keyring_file_data system variables; see the descriptions of those variables in Section 5.1.5, “Server System Variables”.
-DINSTALL_LIBDIR=dir_name
Where to install library files.
-DINSTALL_MANDIR=dir_name
Where to install manual pages.
-DINSTALL_MYSQLKEYRINGDIR=dir_path
The default directory to use as the location of the keyring_file plugin data file. The default value is platform specific and depends on the value of the INSTALL_LAYOUT CMake option; see the description of the keyring_file_data system variable in Section 5.1.5, “Server System Variables”.
-DINSTALL_MYSQLSHAREDIR=dir_name
Where to install shared data files.
-DINSTALL_MYSQLTESTDIR=dir_name
Where to install the mysql-test directory. To suppress installation of this directory, explicitly set the option to the empty value (-DINSTALL_MYSQLTESTDIR=).
-DINSTALL_PKGCONFIGDIR=dir_name
The directory in which to install the mysqlclient.pc file for use by pkg-config. The default value is INSTALL_LIBDIR/pkgconfig, unless INSTALL_LIBDIR ends with /mysql, in which case that is removed first.
-DINSTALL_PLUGINDIR=dir_name
The location of the plugin directory.
This value can be set at server startup with the --plugin_dir option.
-DINSTALL_SBINDIR=dir_name
Where to install the mysqld server.
-DINSTALL_SECURE_FILE_PRIVDIR=dir_name
The default value for the secure_file_priv system variable. The default value is platform specific and depends on the value of the INSTALL_LAYOUT CMake option; see the description of the secure_file_priv system variable in Section 5.1.5, “Server System Variables”.
-DINSTALL_SHAREDIR=dir_name
Where to install aclocal/mysql.m4.
-DINSTALL_STATIC_LIBRARIES=bool
Whether to install static libraries. The default is ON. If set to OFF, these libraries are not installed: libmysqlclient.a, libmysqlservices.a.
-DINSTALL_SUPPORTFILESDIR=dir_name
Where to install extra support files.
-DLINK_RANDOMIZE=bool
Whether to randomize the order of symbols in the mysqld binary. The default is OFF. This option should be enabled only for debugging purposes.
-DLINK_RANDOMIZE_SEED=val
Seed value for the LINK_RANDOMIZE option. The value is a string. The default is mysql, an arbitrary choice.
-DMYSQL_DATADIR=dir_name
The location of the MySQL data directory.
This value can be set at server startup with the --datadir option.
-DODBC_INCLUDES=dir_name
The location of the ODBC includes directory, and may be used while configuring Connector/ODBC.
-DODBC_LIB_DIR=dir_name
The location of the ODBC library directory, and may be used while configuring Connector/ODBC.
-DSYSCONFDIR=dir_name
The default my.cnf option file directory.
This location cannot be set at server startup, but you can start the server with a given option file using the --defaults-file=file_name option, where file_name is the full path name to the file.
-DSYSTEMD_PID_DIR=dir_name
The name of the directory in which to create the PID file when MySQL is managed by systemd. The default is /var/run/mysqld; this might be changed implicitly according to the INSTALL_LAYOUT value.
This option is ignored unless WITH_SYSTEMD is enabled.
-DSYSTEMD_SERVICE_NAME=name
The name of the MySQL service to use when MySQL is managed by systemd. The default is mysqld; this might be changed implicitly according to the INSTALL_LAYOUT value.
This option is ignored unless WITH_SYSTEMD is enabled.
-DTMPDIR=dir_name
The default location to use for the tmpdir system variable. If unspecified, the value defaults to P_tmpdir in <stdio.h>.

Storage Engine Options

Storage engines are built as plugins. You can build a plugin as a static module (compiled into the server) or a dynamic module (built as a dynamic library that must be installed into the server using the INSTALL PLUGIN statement or the --plugin-load option before it can be used). Some plugins might not support static or dynamic building.

The InnoDB, MyISAM, MERGE, MEMORY, and CSV engines are mandatory (always compiled into the server) and need not be installed explicitly.

To compile a storage engine statically into the server, use -DWITH_engine_STORAGE_ENGINE=1. Some permissible engine values are ARCHIVE, BLACKHOLE, EXAMPLE, and FEDERATED. Examples:

-DWITH_ARCHIVE_STORAGE_ENGINE=1
-DWITH_BLACKHOLE_STORAGE_ENGINE=1

Note

It is not possible to compile without Performance Schema support. If it is desired to compile without particular types of instrumentation, that can be done with the following CMake options:

DISABLE_PSI_COND
DISABLE_PSI_FILE
DISABLE_PSI_IDLE
DISABLE_PSI_MEMORY
DISABLE_PSI_METADATA
DISABLE_PSI_MUTEX
DISABLE_PSI_PS
DISABLE_PSI_RWLOCK
DISABLE_PSI_SOCKET
DISABLE_PSI_SP
DISABLE_PSI_STAGE
DISABLE_PSI_STATEMENT
DISABLE_PSI_STATEMENT_DIGEST
DISABLE_PSI_TABLE
DISABLE_PSI_THREAD
DISABLE_PSI_TRANSACTION

For example, to compile without mutex instrumentation, configure MySQL using the -DDISABLE_PSI_MUTEX=1 option.

To exclude a storage engine from the build, use -DWITH_engine_STORAGE_ENGINE=0. Examples:

-DWITH_ARCHIVE_STORAGE_ENGINE=0
-DWITH_EXAMPLE_STORAGE_ENGINE=0
-DWITH_FEDERATED_STORAGE_ENGINE=0

It is also possible to exclude a storage engine from the build using -DWITHOUT_engine_STORAGE_ENGINE=1 (but -DWITH_engine_STORAGE_ENGINE=0 is preferred). Examples:

-DWITHOUT_ARCHIVE_STORAGE_ENGINE=1
-DWITHOUT_EXAMPLE_STORAGE_ENGINE=1
-DWITHOUT_FEDERATED_STORAGE_ENGINE=1

If neither -DWITH_engine_STORAGE_ENGINE nor -DWITHOUT_engine_STORAGE_ENGINE are specified for a given storage engine, the engine is built as a shared module, or excluded if it cannot be built as a shared module.

Feature Options

-DCOMPILATION_COMMENT=string
A descriptive comment about the compilation environment.
-DDEFAULT_CHARSET=charset_name
The server character set. By default, MySQL uses the utf8mb4 character set.
charset_name may be one of binary, armscii8, ascii, big5, cp1250, cp1251, cp1256, cp1257, cp850, cp852, cp866, cp932, dec8, eucjpms, euckr, gb2312, gbk, geostd8, greek, hebrew, hp8, keybcs2, koi8r, koi8u, latin1, latin2, latin5, latin7, macce, macroman, sjis, swe7, tis620, ucs2, ujis, utf8, utf8mb4, utf16, utf16le, utf32. The permissible character sets are listed in the cmake/character_sets.cmake file as the value of CHARSETS_AVAILABLE.
This value can be set at server startup with the --character_set_server option.
-DDEFAULT_COLLATION=collation_name
The server collation. By default, MySQL uses utf8mb4_0900_ai_ci. Use the SHOW COLLATION statement to determine which collations are available for each character set.
This value can be set at server startup with the --collation_server option.
-DDISABLE_PSI_COND=bool
Whether to exclude the Performance Schema condition instrumentation. The default is OFF (include).
-DDISABLE_PSI_FILE=bool
Whether to exclude the Performance Schema file instrumentation. The default is OFF (include).
-DDISABLE_PSI_IDLE=bool
Whether to exclude the Performance Schema idle instrumentation. The default is OFF (include).
-DDISABLE_PSI_MEMORY=bool
Whether to exclude the Performance Schema memory instrumentation. The default is OFF (include).
-DDISABLE_PSI_METADATA=bool
Whether to exclude the Performance Schema metadata instrumentation. The default is OFF (include).
-DDISABLE_PSI_MUTEX=bool
Whether to exclude the Performance Schema mutex instrumentation. The default is OFF (include).
-DDISABLE_PSI_RWLOCK=bool
Whether to exclude the Performance Schema rwlock instrumentation. The default is OFF (include).
-DDISABLE_PSI_SOCKET=bool
Whether to exclude the Performance Schema socket instrumentation. The default is OFF (include).
-DDISABLE_PSI_SP=bool
Whether to exclude the Performance Schema stored program instrumentation. The default is OFF (include).
-DDISABLE_PSI_STAGE=bool
Whether to exclude the Performance Schema stage instrumentation. The default is OFF (include).
-DDISABLE_PSI_STATEMENT=bool
Whether to exclude the Performance Schema statement instrumentation. The default is OFF (include).
-DDISABLE_PSI_STATEMENT_DIGEST=bool
Whether to exclude the Performance Schema statement_digest instrumentation. The default is OFF (include).
-DDISABLE_PSI_TABLE=bool
Whether to exclude the Performance Schema table instrumentation. The default is OFF (include).
-DDISABLE_SHARED=bool
Whether to disable building build shared libraries and compile position-dependent code. The default is OFF (compile position-independent code).
Enabling this option disables -fPIC, with the consequence that shared libraries are not built, including plugins and components. Invoking CMake produces this warning: Dynamic plugins are disabled.
-DDOWNLOAD_BOOST=bool
Whether to download the Boost library. The default is OFF.
See the WITH_BOOST option for additional discussion about using Boost.
-DDOWNLOAD_BOOST_TIMEOUT=seconds
The timeout in seconds for downloading the Boost library. The default is 600 seconds.
See the WITH_BOOST option for additional discussion about using Boost.
-DENABLE_DEBUG_SYNC=bool
As of MySQL 8.0.1, ENABLE_DEBUG_SYNC is removed and enabling WITH_DEBUG enables Debug Sync.
-DENABLE_DOWNLOADS=bool
Whether to download optional files. For example, with this option enabled, CMake downloads the Google Test distribution that is used by the test suite to run unit tests.
-DENABLE_DTRACE=bool
Whether to include support for DTrace probes.
This option was removed in MySQL 8.0.1 because support for DTrace is removed in MySQL 8.1.
-DENABLE_GCOV=bool
Whether to include gcov support (Linux only).
-DENABLE_GPROF=bool
Whether to enable gprof (optimized Linux builds only).
-DENABLED_LOCAL_INFILE=bool
This option controls the compiled-in default LOCAL capability for the MySQL client library. Clients that make no explicit arrangements therefore have LOCAL capability disabled or enabled according to the ENABLED_LOCAL_INFILE setting specified at MySQL build time.
By default, the client library in MySQL binary distributions is compiled with ENABLED_LOCAL_INFILE disabled. If you compile MySQL from source, configure it with ENABLED_LOCAL_INFILE disabled or enabled based on whether clients that make no explicit arrangements should have LOCAL capability disabled or enabled, respectively.
ENABLED_LOCAL_INFILE controls the default for client-side LOCAL capability. For the server, the local_infile system variable controls server-side LOCAL capability. To explicitly cause the server to refuse or permit LOAD DATA LOCAL statements (regardless of how client programs and libraries are configured at build time or runtime), start mysqld with local_infile disabled or enabled, respectively. local_infile can also be set at runtime. See Section 6.1.6, “Security Issues with LOAD DATA LOCAL”.
-DENABLED_PROFILING=bool
Whether to enable query profiling code (for the SHOW PROFILE and SHOW PROFILES statements).
-DFORCE_UNSUPPORTED_COMPILER=bool
By default, CMake checks for minimum versions of supported compilers: Visual Studio 2015 (Windows); GCC 4.8 or Clang 3.4 (Linux); Developer Studio 12.5 (Solaris server); Developer Studio 12.4 or GCC 4.8 (Solaris client library); Clang 3.6 (macOS), Clang 3.4 (FreeBSD). To disable this check, use -DFORCE_UNSUPPORTED_COMPILER=ON.
-DIGNORE_AIO_CHECK=bool
If the -DBUILD_CONFIG=mysql_release option is given on Linux, the libaio library must be linked in by default. If you do not have libaio or do not want to install it, you can suppress the check for it by specifying -DIGNORE_AIO_CHECK=1.
-DMAX_INDEXES=num
The maximum number of indexes per table. The default is 64. The maximum is 255. Values smaller than 64 are ignored and the default of 64 is used.
-DMYSQL_MAINTAINER_MODE=bool
Whether to enable a MySQL maintainer-specific development environment. If enabled, this option causes compiler warnings to become errors.
-DMUTEX_TYPE=type
The mutex type used by InnoDB. Options include:
- event: Use event mutexes. This is the default value and the original InnoDB mutex implementation.
- sys: Use POSIX mutexes on UNIX systems. Use CRITICAL_SECTION onjects on Windows, if available.
- futex: Use Linux futexes instead of condition variables to schedule waiting threads.
-DMYSQLX_TCP_PORT=port_num
The port number on which X Plugin listens for TCP/IP connections. The default is 33060.
This value can be set at server startup with the --mysqlx_port option.
-DMYSQLX_UNIX_ADDR=file_name
The Unix socket file path on which the server listens for X Plugin socket connections. This must be an absolute path name. The default is /tmp/mysqlx.sock.
This value can be set at server startup with the --mysqlx-socket option.
-DMYSQL_PROJECT_NAME=name
For Windows or macOS, the project name to incorporate into the project file name.
-DMYSQL_TCP_PORT=port_num
The port number on which the server listens for TCP/IP connections. The default is 3306.
This value can be set at server startup with the --port option.
-DMYSQL_UNIX_ADDR=file_name
The Unix socket file path on which the server listens for socket connections. This must be an absolute path name. The default is /tmp/mysql.sock.
This value can be set at server startup with the --socket option.
-DOPTIMIZER_TRACE=bool
Whether to support optimizer tracing. See MySQL Internals: Tracing the Optimizer.
-DUSE_LD_GOLD=bool
CMake causes the build process to link with the GNU gold linker if it is available. To suppress use of this linker, specify the -DUSE_LD_GOLD=0 option.
-DWIN_DEBUG_NO_INLINE=bool
Whether to disable function inlining on Windows. The default is off (inlining enabled).
-DWITH_ASAN=bool
Whether to enable the AddressSanitizer, for compilers that support it. The default is off.
-DWITH_AUTHENTICATION_LDAP=bool
Whether to report an error if the LDAP authentication plugins cannot be built:
- If this option is disabled (the default), the LDAP plugins are built if the required header files and libraries are found. If they are not, CMake displays a note about it.
- If this option is enabled, a failure to find the required header file andlibraries causes CMake to produce an error, preventing the server from being built.
-DWITH_AUTHENTICATION_PAM=bool
Whether to build the PAM authentication plugin, for source trees that include this plugin. (See PAM Pluggable Authentication.) If this option is specified and the plugin cannot be compiled, the build fails.
-DWITH_BOOST=path_name
The Boost library is required to build MySQL. These CMake options enable control over the library source location, and whether to download it automatically:
- -DWITH_BOOST=path_name specifies the Boost library directory location. It is also possible to specify the Boost location by setting the BOOST_ROOT or WITH_BOOST environment variable.
  -DWITH_BOOST=system is also permitted and indicates that the correct version of Boost is installed on the compilation host in the standard location. In this case, the installed version of Boost is used rather than any version included with a MySQL source distribution.
- -DDOWNLOAD_BOOST=bool specifies whether to download the Boost source if it is not present in the specified location. The default is OFF.
- -DDOWNLOAD_BOOST_TIMEOUT=seconds the timeout in seconds for downloading the Boost library. The default is 600 seconds.
For example, if you normally build MySQL placing the object output in the bld subdirectory of your MySQL source tree, you can build with Boost like this:
```
mkdir bld
cd bld
cmake .. -DDOWNLOAD_BOOST=ON -DWITH_BOOST=$HOME/my_boost
```
This causes Boost to be downloaded into the my_boost directory under your home directory. If the required Boost version is already there, no download is done. If the required Boost version changes, the newer version is downloaded.
If Boost is already installed locally and your compiler finds the Boost header files on its own, it may not be necessary to specify the preceding CMake options. However, if the version of Boost required by MySQL changes and the locally installed version has not been upgraded, you may have build problems. Using the CMake options should give you a successful build.
-DWITH_CLIENT_PROTOCOL_TRACING=bool
Whether to build the client-side protocol tracing framework into the client library. By default, this option is enabled.
For information about writing protocol trace client plugins, see Section 28.2.4.11, “Writing Protocol Trace Plugins”.
See also the WITH_TEST_TRACE_PLUGIN option.
-DWITH_DEBUG=bool
Whether to include debugging support.
Configuring MySQL with debugging support enables you to use the --debug="d,parser_debug" option when you start the server. This causes the Bison parser that is used to process SQL statements to dump a parser trace to the server's standard error output. Typically, this output is written to the error log.
Sync debug checking for the InnoDB storage engine is defined under UNIV_DEBUG and is available when debugging support is compiled in using the WITH_DEBUG option. When debugging support is compiled in, the innodb_sync_debug configuration option can be used to enable or disable InnoDB sync debug checking.
Enabling WITH_DEBUG also enables Debug Sync. This facility is used for testing and debugging. When compiled in, Debug Sync is disabled by default at runtime. To enable it, start mysqld with the --debug-sync-timeout=N option, where N is a timeout value greater than 0. (The default value is 0, which disables Debug Sync.) N becomes the default timeout for individual synchronization points.
Sync debug checking for the InnoDB storage engine is available when debugging support is compiled in using the WITH_DEBUG option.
For a description of the Debug Sync facility and how to use synchronization points, see MySQL Internals: Test Synchronization.
-DWITH_DEFAULT_FEATURE_SET=bool
Whether to use the flags from cmake/build_configurations/feature_set.cmake.
-DWITH_EDITLINE=value
Which libedit/editline library to use. The permitted values are bundled (the default) and system.
-DWITH_INNODB_EXTRA_DEBUG=bool
Whether to include extra InnoDB debugging support.
Enabling WITH_INNODB_EXTRA_DEBUG turns on extra InnoDB debug checks. This option can only be enabled when WITH_DEBUG is enabled.
-DWITH_INNODB_MEMCACHED=bool
Whether to generate memcached shared libraries (libmemcached.so and innodb_engine.so).
-DWITH_KEYRING_TEST=bool
Whether to build the test program that accompanies the keyring_file plugin. The default is OFF. Test file source code is located in the plugin/keyring/keyring-test directory.
-DWITH_LIBEVENT=string
Which libevent library to use. Permitted values are bundled (default), system, and yes. If you specify system or yes, the system libevent library is used if present. If the system library is not found, the bundled libevent library is used. The libevent library is required by InnoDB memcached.
-DWITH_LIBWRAP=bool
Whether to include libwrap (TCP wrappers) support.
-DWITH_LZ4=lz4_type
The WITH_LZ4 indicates the source of zlib support:
- bundled: Use the lz4 library bundled with the distribution. This is the default.
- system: Use the system lz4 library. If WITH_LZ4 is set to this value, the lz4_decompress utility is not built. In this case, the system lz4 command can be used instead.
-DWITH_MSAN=bool
Whether to enable MemorySanitizer, for compilers that support it. The default is off.
For this option to have an effect if enabled, all libraries linked to MySQL must also have been compiled with the option enabled.
-DWITH_MECAB={disabled|system|path_name}
Use this option to compile the MeCab parser. If you have installed MeCab to its default installation directory, set -DWITH_MECAB=system. The system option applies to MeCab installations performed from source or from binaries using a native package management utility. If you installed MeCab to a custom installation directory, specify the path to the MeCab installation. For example, -DWITH_MECAB=/opt/mecab. If the system option does not work, specifying the MeCab installation path should work in all cases.
For related information, see Section 12.9.9, “MeCab Full-Text Parser Plugin”.
-DWITH_MSCRT_DEBUG=bool
Whether to enable Visual Studio CRT memory leak tracing. The default is OFF.
-DWITH_NUMA=bool
Explicitly set the NUMA memory allocation policy. CMake sets the default WITH_NUMA value based on whether the current platform has NUMA support. For platforms without NUMA support, CMake behaves as follows:
- With no NUMA option (the normal case), CMake continues normally, producing only this warning: NUMA library missing or required version not available
- With -DWITH_NUMA=ON, CMake aborts with this error: NUMA library missing or required version not available
-DWITH_PROTOBUF=protobuf_type
Which Protocol Buffers package to use. protobuf_type can be one of the following values:
- bundled: Use the package bundled with the distribution. This is the default.
- system: Use the package installed on the system.
Other values are ignored, with a fallback to bundled.
-DWITH_RAPID=bool
Whether to build the rapid development cycle plugins. When enabled, a rapid directory is created in the build tree containing these plugins. When disabled, no rapid directory is created in the build tree. The default is ON, unless the rapid directory is removed from the source tree, in which case the default becomes OFF.
-DWITH_SSL={ssl_type|path_name}
The type of SSL support to include or the path name to the OpenSSL installation to use.
- ssl_type can be one of the following values:
  - yes: Use the system SSL library if present, else the library bundled with the distribution.
  - bundled: Use the SSL library bundled with the distribution. This is the default.
  - system: Use the system SSL library.
- path_name is the path name to the OpenSSL installation to use. Using this can be preferable to using the ssl_type value of system, for it can prevent CMake from detecting and using an older or incorrect OpenSSL version installed on the system. (Another permitted way to do the same thing is to set the CMAKE_PREFIX_PATH option to path_name.)
For information about using SSL support, see Section 6.4, “Using Encrypted Connections”.
-DWITH_SYSTEMD=bool
Whether to enable installation of systemd support files. By default, this option is disabled. When enabled, systemd support files are installed, and scripts such as mysqld_safe and the System V initialization script are not installed. On platforms where systemd is not available, enabling WITH_SYSTEMD results in an error from CMake.
For more information about using systemd, see Section 2.5.9, “Managing MySQL Server with systemd”. That section also includes information about specifying options previously specified in [mysqld_safe] option groups. Because mysqld_safe is not installed when systemd is used, such options must be specified another way.
-DWITH_TEST_TRACE_PLUGIN=bool
Whether to build the test protocol trace client plugin (see Section 28.2.4.11.1, “Using the Test Protocol Trace Plugin”). By default, this option is disabled. Enabling this option has no effect unless the WITH_CLIENT_PROTOCOL_TRACING option is enabled. If MySQL is configured with both options enabled, the libmysqlclient client library is built with the test protocol trace plugin built in, and all the standard MySQL clients load the plugin. However, even when the test plugin is enabled, it has no effect by default. Control over the plugin is afforded using environment variables; see Section 28.2.4.11.1, “Using the Test Protocol Trace Plugin”.

Note

Do not enable the WITH_TEST_TRACE_PLUGIN option if you want to use your own protocol trace plugins because only one such plugin can be loaded at a time and an error occurs for attempts to load a second one. If you have already built MySQL with the test protocol trace plugin enabled to see how it works, you must rebuild MySQL without it before you can use your own plugins.

For information about writing trace plugins, see Section 28.2.4.11, “Writing Protocol Trace Plugins”.
-DWITH_TSAN=bool
Whether to enable the ThreadSanitizer, for compilers that support it. The default is off.
-DWITH_UBSAN=bool
Whether to enable the Undefined Behavior Sanitizer, for compilers that support it. The default is off.
-DWITH_UNIT_TESTS={ON|OFF}
If enabled, compile MySQL with unit tests. The default is ON unless the server is not being compiled.
-DWITH_UNIXODBC=1
Enables unixODBC support, for Connector/ODBC.
-DWITH_VALGRIND=bool
Whether to compile in the Valgrind header files, which exposes the Valgrind API to MySQL code. The default is OFF.
To generate a Valgrind-aware debug build, -DWITH_VALGRIND=1 normally is combined with -DWITH_DEBUG=1. See Building Debug Configurations.
-DWITH_ZLIB=zlib_type
Some features require that the server be built with compression library support, such as the COMPRESS() and UNCOMPRESS() functions, and compression of the client/server protocol. The WITH_ZLIB indicates the source of zlib support:
- bundled: Use the zlib library bundled with the distribution. This is the default.
- system: Use the system zlib library. If WITH_ZLIB is set to this value, the zlib_decompress utility is not built. In this case, the system openssl zlib command can be used instead.
-DWITHOUT_SERVER=bool
Whether to build without the MySQL server. The default is OFF, which does build the server.

Compiler Flags

-DCMAKE_C_FLAGS="flags"
Flags for the C Compiler.
-DCMAKE_CXX_FLAGS="flags"
Flags for the C++ Compiler.
-DWITH_DEFAULT_COMPILER_OPTIONS=bool
Whether to use the flags from cmake/build_configurations/compiler_options.cmake.

Note

All optimization flags were carefully chosen and tested by the MySQL build team. Overriding them can lead to unexpected results and is done at your own risk.

To specify your own C and C++ compiler flags, for flags that do not affect optimization, use the CMAKE_C_FLAGS and CMAKE_CXX_FLAGS CMake options.

When providing your own compiler flags, you might want to specify CMAKE_BUILD_TYPE as well.

For example, to create a 32-bit release build on a 64-bit Linux machine, do this:

shell> mkdir bld
shell> cd bld
shell> cmake .. -DCMAKE_C_FLAGS=-m32 \
         -DCMAKE_CXX_FLAGS=-m32 \
         -DCMAKE_BUILD_TYPE=RelWithDebInfo

If you set flags that affect optimization (-Onumber), you must set the CMAKE_C_FLAGS_build_type and/or CMAKE_CXX_FLAGS_build_type options, where build_type corresponds to the CMAKE_BUILD_TYPE value. To specify a different optimization for the default build type (RelWithDebInfo) set the CMAKE_C_FLAGS_RELWITHDEBINFO and CMAKE_CXX_FLAGS_RELWITHDEBINFO options. For example, to compile on Linux with -O3 and with debug symbols, do this:

shell> cmake .. -DCMAKE_C_FLAGS_RELWITHDEBINFO="-O3 -g" \
         -DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-O3 -g"

2.8.5 Dealing with Problems Compiling MySQL

The solution to many problems involves reconfiguring. If you do reconfigure, take note of the following:

If CMake is run after it has previously been run, it may use information that was gathered during its previous invocation. This information is stored in CMakeCache.txt. When CMake starts up, it looks for that file and reads its contents if it exists, on the assumption that the information is still correct. That assumption is invalid when you reconfigure.
Each time you run CMake, you must run make again to recompile. However, you may want to remove old object files from previous builds first because they were compiled using different configuration options.

To prevent old object files or configuration information from being used, run the following commands before re-running CMake:

On Unix:

shell> make clean
shell> rm CMakeCache.txt

On Windows:

shell> devenv MySQL.sln /clean
shell> del CMakeCache.txt

If you build outside of the source tree, remove and recreate your build directory before re-running CMake. For instructions on building outside of the source tree, see How to Build MySQL Server with CMake.

On some systems, warnings may occur due to differences in system include files. The following list describes other problems that have been found to occur most often when compiling MySQL:

To define which C and C++ compilers to use, you can define the CC and CXX environment variables. For example:
```
shell> CC=gcc
shell> CXX=g++
shell> export CC CXX
```
To specify your own C and C++ compiler flags, use the CMAKE_C_FLAGS and CMAKE_CXX_FLAGS CMake options. See Compiler Flags.
To see what flags you might need to specify, invoke mysql_config with the --cflags and --cxxflags options.
To see what commands are executed during the compile stage, after using CMake to configure MySQL, run make VERBOSE=1 rather than just make.
If compilation fails, check whether the MYSQL_MAINTAINER_MODE option is enabled. This mode causes compiler warnings to become errors, so disabling it may enable compilation to proceed.
If your compile fails with errors such as any of the following, you must upgrade your version of make to GNU make:
```
make: Fatal error in reader: Makefile, line 18:
Badly formed macro assignment
```
Or:
```
make: file `Makefile' line 18: Must be a separator (:
```
Or:
```
pthread.h: No such file or directory
```
Solaris and FreeBSD are known to have troublesome make programs.
GNU make 3.75 is known to work.
The sql_yacc.cc file is generated from sql_yacc.yy. Normally, the build process does not need to create sql_yacc.cc because MySQL comes with a pregenerated copy. However, if you do need to re-create it, you might encounter this error:
```
"sql_yacc.yy", line xxx fatal: default action causes potential...
```
This is a sign that your version of yacc is deficient. You probably need to install a recent version of bison (the GNU version of yacc) and use that instead.
Versions of bison older than 1.75 may report this error:
```
sql_yacc.yy:#####: fatal error: maximum table size (32767) exceeded
```
The maximum table size is not actually exceeded; the error is caused by bugs in older versions of bison.

For information about acquiring or updating tools, see the system requirements in Section 2.8, “Installing MySQL from Source”.

2.8.6 MySQL Configuration and Third-Party Tools

Third-party tools that need to determine the MySQL version from the MySQL source can read the VERSION file in the top-level source directory. The file lists the pieces of the version separately. For example, if the version is MySQL 8.0.4-m14, the file looks like this:

MYSQL_VERSION_MAJOR=8
MYSQL_VERSION_MINOR=0
MYSQL_VERSION_PATCH=4
MYSQL_VERSION_EXTRA=-m14

If the source is not for a General Availablility (GA) release, the MYSQL_VERSION_EXTRA value will be nonempty. For the example, the value corresponds to Milestone 14.

To construct a five-digit number from the version components, use this formula:

MYSQL_VERSION_MAJOR*10000 + MYSQL_VERSION_MINOR*100 + MYSQL_VERSION_PATCH

2.8.7 Generating MySQL Doxygen Documentation Content

Install doxygen 1.8.11 or higher. Distributions are available here:
```
http://www.stack.nl/~dimitri/doxygen/download.html
```
After installing doxygen, verify the version number:
```
shell> doxygen --version
1.8.11
```
Install PlantUML. Distributions are available here:
```
http://plantuml.com/download.html
```
When you install PlantUML on Windows (tested on Windows 10), you must run it at least once as administrator so it creates the registry keys. Open an administrator console and run this command:
```
java -jar path-to-plantuml.jar
```
The command should open a GUI window and return no errors on the console.
Install the Graphviz dot command. Distributions are available here:
```
http://www.graphviz.org/
```
After installing Graphviz, verify dot availability. For example:
```
shell> which dot
/usr/bin/dot
shell> dot -V
dot - graphviz version 2.28.0 (20130928.0220)
```
Set the PLANTUML_JAR_PATH environment to the location where you installed PlantUML. For example:
```
export PLANTUML_JAR_PATH=path-to-plantuml.jar
```
To invoke doxygen, change location to the top-level directory of your MySQL source distribution and execute these commands:
```
mkdir -p generated/doxygen
doxygen
```
Inspect the error log. It is available in the doxyerror.log file in the top-level directory. Assuming that the build executed successfully, view the generated output using a browser. For example:
```
firefox generated/doxygen/html/index.html
```
You can use a different browser, and even bookmark the page.

2.9 Postinstallation Setup and Testing

2.9.1 Initializing the Data Directory
2.9.2 Starting the Server
2.9.3 Testing the Server
2.9.4 Securing the Initial MySQL Account
2.9.5 Starting and Stopping MySQL Automatically

This section discusses tasks that you should perform after installing MySQL:

If necessary, initialize the data directory and create the MySQL grant tables. For some MySQL installation methods, data directory initialization may be done for you automatically:
- Windows installation operations performed by MySQL Installer initialize the data directory automatically.
- Installation on Linux using a server RPM distribution.
- Installation using the native packaging system on many platforms, including Debian Linux, Ubuntu Linux, Gentoo Linux, and others.
- Installation on OS X using a DMG distribution.
For other platforms and installation types, including installation from generic binary and source distributions, you must initialize the data directory yourself. For instructions, see Section 2.9.1, “Initializing the Data Directory”.
Start the server and make sure that it can be accessed. For instructions, see Section 2.9.2, “Starting the Server”, and Section 2.9.3, “Testing the Server”.
Assign passwords to the initial root account in the grant tables, if that was not already done during data directory initialization. Passwords prevent unauthorized access to the MySQL server. For instructions, see Section 2.9.4, “Securing the Initial MySQL Account”.
Optionally, arrange for the server to start and stop automatically when your system starts and stops. For instructions, see Section 2.9.5, “Starting and Stopping MySQL Automatically”.
Optionally, populate time zone tables to enable recognition of named time zones. For instructions, see Section 10.6, “MySQL Server Time Zone Support”.

When you are ready to create additional user accounts, you can find information on the MySQL access control system and account management in Section 6.2, “The MySQL Access Privilege System”, and Section 6.3, “MySQL User Account Management”.

2.9.1 Initializing the Data Directory

2.9.1.1 Initializing the Data Directory Manually Using mysqld

After installing MySQL, you must initialize the data directory, including the tables in the mysql system database. For some MySQL installation methods, data directory initialization may be done automatically, as described in Section 2.9, “Postinstallation Setup and Testing”. For other installation methods, including installation from generic binary and source distributions, you must initialize the data directory yourself.

This section describes how to initialize the data directory on Unix and Unix-like systems. (For Windows, see Section 2.3.7, “Windows Postinstallation Procedures”.) For some suggested commands that you can use to test whether the server is accessible and working properly, see Section 2.9.3, “Testing the Server”.

In the examples shown here, the server runs under the user ID of the mysql login account. This assumes that such an account exists. Either create the account if it does not exist, or substitute the name of a different existing login account that you plan to use for running the server. For information about creating the account, see Creating a mysql System User and Group, in Section 2.2, “Installing MySQL on Unix/Linux Using Generic Binaries”.

Change location into the top-level directory of your MySQL installation, represented here by BASEDIR:
```
shell> cd BASEDIR
```
BASEDIR is likely to be something like /usr/local/mysql or /usr/local. The following steps assume that you have changed location to this directory.
You will find several files and subdirectories in the BASEDIR directory. The most important for installation purposes is the bin subdirectory, which contains the server as well as client and utility programs.
Create a directory that provides a location to use as the value of the secure_file_priv system variable that limits import/export operations to a specific directory. See Section 5.1.5, “Server System Variables”.
```
shell> mkdir mysql-files
shell> chmod 750 mysql-files
```
If necessary, ensure that the distribution contents are accessible to mysql. If you installed the distribution as mysql, no further action is required. If you installed the distribution as root, its contents will be owned by root. Change its ownership to mysql by executing the following commands as root in the installation directory. The first command changes the owner attribute of the files to the mysql user. The second changes the group attribute to the mysql group.
```
shell> chown -R mysql .
shell> chgrp -R mysql .
```
If necessary, initialize the data directory, including the mysql database containing the initial MySQL grant tables that determine how users are permitted to connect to the server.
Typically, data directory initialization need be done only the first time you install MySQL. If you are upgrading an existing installation, you should run mysql_upgrade instead (see Section 4.4.5, “mysql_upgrade — Check and Upgrade MySQL Tables”). However, the command that initializes the data directory does not overwrite any existing privilege tables, so it should be safe to run in any circumstances.
Use the server to initialize the data directory:
```
shell> bin/mysqld --initialize --user=mysql
```
For more information, see Section 2.9.1.1, “Initializing the Data Directory Manually Using mysqld”.
If you want the server to be able to deploy with automatic support for secure connections, use the mysql_ssl_rsa_setup utility to create default SSL and RSA files:
```
shell> mysql_ssl_rsa_setup
```
For more information, see Section 4.4.3, “mysql_ssl_rsa_setup — Create SSL/RSA Files”.
After initializing the data directory, you can establish the final installation ownership settings. To leave the installation owned by mysql, no action is required here. Otherwise, most of the MySQL installation can be owned by root if you like. The exception is that the data directory and the mysql-files directory must be owned by mysql. To accomplish this, run the following commands as root in the installation directory. For some distribution types, the data directory might be named var rather than data; adjust the second command accordingly.
```
shell> chown -R root .
shell> chown -R mysql data mysql-files
```
If the plugin directory (the directory named by the plugin_dir system variable) is writable by the server, it may be possible for a user to write executable code to a file in the directory using SELECT ... INTO DUMPFILE. This can be prevented by making the plugin directory read only to the server or by setting the secure_file_priv system variable at server startup to a directory where SELECT writes can be performed safely. (For example, set it to the mysql-files directory created earlier.)
To specify options that the MySQL server should use at startup, put them in a /etc/my.cnf or /etc/mysql/my.cnf file. You can use such a file, for example, to set the secure_file_priv system variable. See Section 5.1.2, “Server Configuration Defaults”. If you do not do this, the server starts with its default settings.
If you want MySQL to start automatically when you boot your machine, see Section 2.9.5, “Starting and Stopping MySQL Automatically”.

Data directory initialization creates time zone tables in the mysql database but does not populate them. To do so, use the instructions in Section 10.6, “MySQL Server Time Zone Support”.

2.9.1.1 Initializing the Data Directory Manually Using mysqld

This section describes how to initialize the data directory using mysqld, the MySQL server.

The following instructions assume that your current location is the MySQL installation directory, represented here by BASEDIR:

shell> cd BASEDIR

To initialize the data directory, invoke mysqld with the --initialize or --initialize-insecure option, depending on whether you want the server to generate a random initial password for the 'root'@'localhost' account.

On Windows, use one of these commands:

C:\> bin\mysqld --initialize
C:\> bin\mysqld --initialize-insecure

On Unix and Unix-like systems, it is important to make sure that the database directories and files are owned by the mysql login account so that the server has read and write access to them when you run it later. To ensure this, start mysqld from the system root account and include the --user option as shown here:

shell> bin/mysqld --initialize --user=mysql
shell> bin/mysqld --initialize-insecure --user=mysql

Otherwise, execute the program while logged in as mysql, in which case you can omit the --user option from the command.

Regardless of platform, use --initialize for “secure by default” installation (that is, including generation of a random initial root password). In this case, the password is marked as expired and you will need to choose a new one. With the --initialize-insecure option, no root password is generated; it is assumed that you will assign a password to the account in timely fashion before putting the server into production use.

It might be necessary to specify other options such as --basedir or --datadir if mysqld does not identify the correct locations for the installation directory or data directory. For example (enter the command on one line):

shell> bin/mysqld --initialize --user=mysql
         --basedir=/opt/mysql/mysql
         --datadir=/opt/mysql/mysql/data

Alternatively, put the relevant option settings in an option file and pass the name of that file to mysqld. For Unix and Unix-like systems, suppose that the option file name is /opt/mysql/mysql/etc/my.cnf. Put these lines in the file:

[mysqld]
basedir=/opt/mysql/mysql
datadir=/opt/mysql/mysql/data

Then invoke mysqld as follows (enter the command on a single line with the --defaults-file option first):

shell> bin/mysqld --defaults-file=/opt/mysql/mysql/etc/my.cnf
         --initialize --user=mysql

On Windows, suppose that C:\my.ini contains these lines:

[mysqld]
basedir=C:\\Program Files\\MySQL\\MySQL Server 8.0
datadir=D:\\MySQLdata

Then invoke mysqld as follows (the --defaults-file option must be first):

C:\> bin/mysqld --defaults-file=C:\my.ini --initialize

When invoked with the --initialize or --initialize-insecure option, mysqld performs the following initialization sequence.

Note

The server writes any messages to its standard error output. This may be redirected to the error log, so look there if you do not see the messages on your screen. For information about the error log, including where it is located, see Section 5.4.2, “The Error Log”.

On Windows, use the --console option to direct messages to the console.

The server checks the existence of the data directory:
- If no data directory exists, the server creates it.
- If a data directory exists but is not empty (that is, it contains files or subdirectories), the server exits after producing an error message:
```
[ERROR] --initialize specified but the data directory exists. Aborting.
```
  In this case, remove or rename the data directory and try again.
  An existing data directory is permitted to be nonempty if every entry has a name that begins with a period (.).
Within the data directory, the server creates the mysql system database and its tables, including the grant tables, server-side help tables, and time zone tables. For a complete listing and description of the grant tables, see Section 6.2, “The MySQL Access Privilege System”.
The server initializes the system tablespace and related data structures needed to manage InnoDB tables.

Note

After mysqld sets up the InnoDB system tablespace, changes to some tablespace characteristics require setting up a whole new instance. This includes the file name of the first file in the system tablespace and the number of undo logs. If you do not want to use the default values, make sure that the settings for the innodb_data_file_path and innodb_log_file_size configuration parameters are in place in the MySQL configuration file before running mysqld. Also make sure to specify as necessary other parameters that affect the creation and location of InnoDB files, such as innodb_data_home_dir and innodb_log_group_home_dir.
If those options are in your configuration file but that file is not in a location that MySQL reads by default, specify the file location using the --defaults-extra-file option when you run mysqld.
The server creates a 'root'@'localhost' superuser account and other reserved accounts (see Section 6.3.5, “Reserved User Accounts”). Some reserved accounts are locked and cannot be used by clients, but 'root'@'localhost' is intended for administrative use and you should assign it a password.
The server's action with respect to a password for the 'root'@'localhost' account depends on how you invoke it:
- With --initialize but not --initialize-insecure, the server generates a random password, marks it as expired, and writes a message displaying the password:
```
[Warning] A temporary password is generated for root@localhost:
iTag*AfrH5ej
```
- With --initialize-insecure, (either with or without --initialize because --initialize-insecure implies --initialize), the server does not generate a password or mark it expired, and writes a warning message:
```
Warning] root@localhost is created with an empty password ! Please
consider switching off the --initialize-insecure option.
```
See later in this section for instructions on assigning a new 'root'@'localhost' password.
The server populates the server-side help tables if content is available (in the fill_help_tables.sql file). The server does not populate the time zone tables; to do so, see Section 10.6, “MySQL Server Time Zone Support”.
If the --init-file option was given to name a file of SQL statements, the server executes the statements in the file. This option enables you to perform custom bootstrapping sequences.
When the server operates in bootstrap mode, some functionality is unavailable that limits the statements permitted in the file. These include statements that relate to account management (such as CREATE USER or GRANT), replication, and global transaction identifiers.
The server exits.

After you initialize the data directory by starting the server with --initialize or --initialize-insecure, start the server normally (that is, without either of those options) and assign the 'root'@'localhost' account a new password:

Start the server. For instructions, see Section 2.9.2, “Starting the Server”.
Connect to the server:
- If you used --initialize but not --initialize-insecure to initialize the data directory, connect to the server as root using the random password that the server generated during the initialization sequence:
```
shell> mysql -u root -p
Enter password: (enter the random root password here)
```
  Look in the server error log if you do not know this password.
- If you used --initialize-insecure to initialize the data directory, connect to the server as root without a password:
```
shell> mysql -u root --skip-password
```

After connecting, assign a new root password:

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

Note

The data directory initialization sequence performed by the server does not substitute for the actions performed by mysql_secure_installation or mysql_ssl_rsa_setup. See Section 4.4.2, “mysql_secure_installation — Improve MySQL Installation Security”, and Section 4.4.3, “mysql_ssl_rsa_setup — Create SSL/RSA Files”.

2.9.2 Starting the Server

2.9.2.1 Troubleshooting Problems Starting the MySQL Server

This section describes how start the server on Unix and Unix-like systems. (For Windows, see Section 2.3.5.5, “Starting the Server for the First Time”.) For some suggested commands that you can use to test whether the server is accessible and working properly, see Section 2.9.3, “Testing the Server”.

Start the MySQL server like this if your installation includes mysqld_safe:

shell> bin/mysqld_safe --user=mysql &

Note

For Linux systems on which MySQL is installed using RPM packages, server startup and shutdown is managed using systemd rather than mysqld_safe, and mysqld_safe is not installed.

Start the server like this if your installation includes systemd support:

shell> systemctl start mysqld

Substitute the appropriate service name if it differs from mysqld; for example, mysql on SLES systems.

It is important that the MySQL server be run using an unprivileged (non-root) login account. To ensure this, run mysqld_safe as root and include the --user option as shown. Otherwise, you should execute the program while logged in as mysql, in which case you can omit the --user option from the command.

For further instructions for running MySQL as an unprivileged user, see Section 6.1.5, “How to Run MySQL as a Normal User”.

If the command fails immediately and prints mysqld ended, look for information in the error log (which by default is the host_name.err file in the data directory).

If the server is unable to access the data directory it starts or read the grant tables in the mysql database, it writes a message to its error log. Such problems can occur if you neglected to create the grant tables by initializing the data directory before proceeding to this step, or if you ran the command that initializes the data directory without the --user option. Remove the data directory and run the command with the --user option.

If you have other problems starting the server, see Section 2.9.2.1, “Troubleshooting Problems Starting the MySQL Server”. For more information about mysqld_safe, see Section 4.3.2, “mysqld_safe — MySQL Server Startup Script”. For more information about systemd support, see Section 2.5.9, “Managing MySQL Server with systemd”.

2.9.2.1 Troubleshooting Problems Starting the MySQL Server

This section provides troubleshooting suggestions for problems starting the server. For additional suggestions for Windows systems, see Section 2.3.6, “Troubleshooting a Microsoft Windows MySQL Server Installation”.

If you have problems starting the server, here are some things to try:

Check the error log to see why the server does not start. Log files are located in the data directory (typically C:\Program Files\MySQL\MySQL Server 8.0\data on Windows, /usr/local/mysql/data for a Unix/Linux binary distribution, and /usr/local/var for a Unix/Linux source distribution). Look in the data directory for files with names of the form host_name.err and host_name.log, where host_name is the name of your server host. Then examine the last few lines of these files. Use tail to display them:
```
shell> tail host_name.err
shell> tail host_name.log
```
Specify any special options needed by the storage engines you are using. You can create a my.cnf file and specify startup options for the engines that you plan to use. If you are going to use storage engines that support transactional tables (InnoDB, NDB), be sure that you have them configured the way you want before starting the server. If you are using InnoDB tables, see Section 15.6, “InnoDB Configuration” for guidelines and Section 15.13, “InnoDB Startup Options and System Variables” for option syntax.
Although storage engines use default values for options that you omit, Oracle recommends that you review the available options and specify explicit values for any options whose defaults are not appropriate for your installation.
Make sure that the server knows where to find the data directory. The mysqld server uses this directory as its current directory. This is where it expects to find databases and where it expects to write log files. The server also writes the pid (process ID) file in the data directory.
The default data directory location is hardcoded when the server is compiled. To determine what the default path settings are, invoke mysqld with the --verbose and --help options. If the data directory is located somewhere else on your system, specify that location with the --datadir option to mysqld or mysqld_safe, on the command line or in an option file. Otherwise, the server will not work properly. As an alternative to the --datadir option, you can specify mysqld the location of the base directory under which MySQL is installed with the --basedir, and mysqld looks for the data directory there.
To check the effect of specifying path options, invoke mysqld with those options followed by the --verbose and --help options. For example, if you change location into the directory where mysqld is installed and then run the following command, it shows the effect of starting the server with a base directory of /usr/local:
```
shell> ./mysqld --basedir=/usr/local --verbose --help
```
You can specify other options such as --datadir as well, but --verbose and --help must be the last options.
Once you determine the path settings you want, start the server without --verbose and --help.
If mysqld is currently running, you can find out what path settings it is using by executing this command:
```
shell> mysqladmin variables
```
Or:
```
shell> mysqladmin -h host_name variables
```
host_name is the name of the MySQL server host.
Make sure that the server can access the data directory. The ownership and permissions of the data directory and its contents must allow the server to read and modify them.
If you get Errcode 13 (which means Permission denied) when starting mysqld, this means that the privileges of the data directory or its contents do not permit server access. In this case, you change the permissions for the involved files and directories so that the server has the right to use them. You can also start the server as root, but this raises security issues and should be avoided.
Change location into the data directory and check the ownership of the data directory and its contents to make sure the server has access. For example, if the data directory is /usr/local/mysql/var, use this command:
```
shell> ls -la /usr/local/mysql/var
```
If the data directory or its files or subdirectories are not owned by the login account that you use for running the server, change their ownership to that account. If the account is named mysql, use these commands:
```
shell> chown -R mysql /usr/local/mysql/var
shell> chgrp -R mysql /usr/local/mysql/var
```
Even with correct ownership, MySQL might fail to start up if there is other security software running on your system that manages application access to various parts of the file system. In this case, reconfigure that software to enable mysqld to access the directories it uses during normal operation.
Verify that the network interfaces the server wants to use are available.
If either of the following errors occur, it means that some other program (perhaps another mysqld server) is using the TCP/IP port or Unix socket file that mysqld is trying to use:
```
Can't start server: Bind on TCP/IP port: Address already in use
Can't start server: Bind on unix socket...
```
Use ps to determine whether you have another mysqld server running. If so, shut down the server before starting mysqld again. (If another server is running, and you really want to run multiple servers, you can find information about how to do so in Section 5.7, “Running Multiple MySQL Instances on One Machine”.)
If no other server is running, execute the command telnet your_host_name tcp_ip_port_number. (The default MySQL port number is 3306.) Then press Enter a couple of times. If you do not get an error message like telnet: Unable to connect to remote host: Connection refused, some other program is using the TCP/IP port that mysqld is trying to use. Track down what program this is and disable it, or tell mysqld to listen to a different port with the --port option. In this case, specify the same non-default port number for client programs when connecting to the server using TCP/IP.
Another reason the port might be inaccessible is that you have a firewall running that blocks connections to it. If so, modify the firewall settings to permit access to the port.
If the server starts but you cannot connect to it, make sure that you have an entry in /etc/hosts that looks like this:
```
127.0.0.1       localhost
```
If you cannot get mysqld to start, try to make a trace file to find the problem by using the --debug option. See Section 28.5.3, “The DBUG Package”.

2.9.3 Testing the Server

After the data directory is initialized and you have started the server, perform some simple tests to make sure that it works satisfactorily. This section assumes that your current location is the MySQL installation directory and that it has a bin subdirectory containing the MySQL programs used here. If that is not true, adjust the command path names accordingly.

Alternatively, add the bin directory to your PATH environment variable setting. That enables your shell (command interpreter) to find MySQL programs properly, so that you can run a program by typing only its name, not its path name. See Section 4.2.10, “Setting Environment Variables”.

Use mysqladmin to verify that the server is running. The following commands provide simple tests to check whether the server is up and responding to connections:

shell> bin/mysqladmin version
shell> bin/mysqladmin variables

If you cannot connect to the server, specify a -u root option to connect as root. If you have assigned a password for the root account already, you'll also need to specify -p on the command line and enter the password when prompted. For example:

shell> bin/mysqladmin -u root -p version
Enter password: (enter root password here)

The output from mysqladmin version varies slightly depending on your platform and version of MySQL, but should be similar to that shown here:

shell> bin/mysqladmin version
mysqladmin  Ver 14.12 Distrib 8.0.4, for pc-linux-gnu on i686
...

Server version          8.0.4
Protocol version        10
Connection              Localhost via UNIX socket
UNIX socket             /var/lib/mysql/mysql.sock
Uptime:                 14 days 5 hours 5 min 21 sec

Threads: 1  Questions: 366  Slow queries: 0
Opens: 0  Flush tables: 1  Open tables: 19
Queries per second avg: 0.000

To see what else you can do with mysqladmin, invoke it with the --help option.

Verify that you can shut down the server (include a -p option if the root account has a password already):

shell> bin/mysqladmin -u root shutdown

Verify that you can start the server again. Do this by using mysqld_safe or by invoking mysqld directly. For example:

shell> bin/mysqld_safe --user=mysql &

If mysqld_safe fails, see Section 2.9.2.1, “Troubleshooting Problems Starting the MySQL Server”.

Run some simple tests to verify that you can retrieve information from the server. The output should be similar to that shown here.

Use mysqlshow to see what databases exist:

shell> bin/mysqlshow
+--------------------+
|     Databases      |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

The list of installed databases may vary, but will always include the minimum of mysql and information_schema.

If you specify a database name, mysqlshow displays a list of the tables within the database:

shell> bin/mysqlshow mysql
Database: mysql
+---------------------------+
|          Tables           |
+---------------------------+
| columns_priv              |
| db                        |
| engine_cost               |
| event                     |
| func                      |
| general_log               |
| gtid_executed             |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| innodb_index_stats        |
| innodb_table_stats        |
| ndb_binlog_index          |
| plugin                    |
| proc                      |
| procs_priv                |
| proxies_priv              |
| server_cost               |
| servers                   |
| slave_master_info         |
| slave_relay_log_info      |
| slave_worker_info         |
| slow_log                  |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+

Use the mysql program to select information from a table in the mysql database:

shell> bin/mysql -e "SELECT User, Host, plugin FROM mysql.user" mysql
+------+-----------+-----------------------+
| User | Host      | plugin                |
+------+-----------+-----------------------+
| root | localhost | mysql_native_password |
+------+-----------+-----------------------+

At this point, your server is running and you can access it. To tighten security if you have not yet assigned a password to the initial account, follow the instructions in Section 2.9.4, “Securing the Initial MySQL Account”.

For more information about mysql, mysqladmin, and mysqlshow, see Section 4.5.1, “mysql — The MySQL Command-Line Tool”, Section 4.5.2, “mysqladmin — Client for Administering a MySQL Server”, and Section 4.5.8, “mysqlshow — Display Database, Table, and Column Information”.

2.9.4 Securing the Initial MySQL Account

The MySQL installation process involves initializing the data directory, including the mysql database containing the grant tables that define MySQL accounts. For details, see Section 2.9, “Postinstallation Setup and Testing”.

This section describes how to assign a password to the initial root account created during the MySQL installation procedure, if you have not already done so.

Note

On Windows, you can also perform the process described in this section during installation with MySQL Installer (see Section 2.3.3, “MySQL Installer for Windows”). On all platforms, the MySQL distribution includes mysql_secure_installation, a command-line utility that automates much of the process of securing a MySQL installation. MySQL Workbench is available on all platforms, and also offers the ability to manage user accounts (see Chapter 30, MySQL Workbench ).

A password may already be assigned to the initial account under these circumstances:

On Windows, installations performed using MySQL Installer give you the option of assigning a password.
Installation using the OS X installer generates an initial random password, which the installer displays to the user in a dialog box.
Installation using RPM packages generates an initial random password, which is written to the server error log.
For data directory initialization performed manually using mysqld --initialize, mysqld generates an initial random password, marks it expired, and writes it to the server error log. For details, see Section 2.9.1.1, “Initializing the Data Directory Manually Using mysqld”.

The mysql.user grant table defines the initial MySQL user account and its access privileges. Installation of MySQL creates only a 'root'@'localhost' superuser account that has all privileges and can do anything. If the root account has an empty password, your MySQL installation is unprotected: Anyone can connect to the MySQL server as root without a password and be granted all privileges.

The 'root'@'localhost' account also has a row in the mysql.proxies_priv table that enables granting the PROXY privilege for ''@'', that is, for all users and all hosts. This enables root to set up proxy users, as well as to delegate to other accounts the authority to set up proxy users. See Section 6.3.11, “Proxy Users”.

To assign a password for the initial MySQL root account, use the following procedure. Replace new_password in the examples with the password that you want to use.

Start the server if it is not running. For instructions, see Section 2.9.2, “Starting the Server”.

The initial root account may or may not have a password. Choose whichever of the following procedures applies:

If the root account exists with an initial random password that has been expired, connect to the server as root using that password, then choose a new password. This is the case if the data directory was initialized using mysqld --initialize, either manually or using an installer that does not give you the option of specifying a password during the install operation. Because the password exists, you must use it to connect to the server. But because the password is expired, you cannot use the account for any purpose other than to choose a new password, until you do choose one.
1. If you do not know the initial random password, look in the server error log.
2. Connect to the server as root using the password:
```
shell> mysql -u root -p
Enter password: (enter the random root password here)
```
3. Choose a new password to replace the random password:
```
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
```
If the root account exists but has no password, connect to the server as root using no password, then assign a password. This is the case if you initialized the data directory using mysqld --initialize-insecure.
1. Connect to the server as root using no password:
```
shell> mysql -u root --skip-password
```
2. Assign a password:
```
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
```

After assigning the root account a password, you must supply that password whenever you connect to the server using the account. For example, to connect to the server using the mysql client, use this command:

shell> mysql -u root -p
Enter password: (enter root password here)

To shut down the server with mysqladmin, use this command:

shell> mysqladmin -u root -p shutdown
Enter password: (enter root password here)

Note

For additional information about setting passwords, see Section 6.3.7, “Assigning Account Passwords”. If you forget your root password after setting it, see Section B.5.3.2, “How to Reset the Root Password”.

To set up additional accounts, see Section 6.3.2, “Adding User Accounts”.

2.9.5 Starting and Stopping MySQL Automatically

This section discusses methods for starting and stopping the MySQL server.

Generally, you start the mysqld server in one of these ways:

Invoke mysqld directly. This works on any platform.
On Windows, you can set up a MySQL service that runs automatically when Windows starts. See Section 2.3.5.8, “Starting MySQL as a Windows Service”.
On Unix and Unix-like systems, you can invoke mysqld_safe, which tries to determine the proper options for mysqld and then runs it with those options. See Section 4.3.2, “mysqld_safe — MySQL Server Startup Script”.
On Linux systems that support systemd, you can use it to control the server. See Section 2.5.9, “Managing MySQL Server with systemd”.
On systems that use System V-style run directories (that is, /etc/init.d and run-level specific directories), invoke mysql.server. This script is used primarily at system startup and shutdown. It usually is installed under the name mysql. The mysql.server script starts the server by invoking mysqld_safe. See Section 4.3.3, “mysql.server — MySQL Server Startup Script”.
On OS X, install a launchd daemon to enable automatic MySQL startup at system startup. The daemon starts the server by invoking mysqld_safe. For details, see Section 2.4.3, “Installing a MySQL Launch Daemon”. A MySQL Preference Pane also provides control for starting and stopping MySQL through the System Preferences. See Section 2.4.4, “Installing and Using the MySQL Preference Pane”.
On Solaris, use the service management framework (SMF) system to initiate and control MySQL startup.

systemd, the mysqld_safe and mysql.server scripts, Solaris SMF, and the OS X Startup Item (or MySQL Preference Pane) can be used to start the server manually, or automatically at system startup time. systemd, mysql.server, and the Startup Item also can be used to stop the server.

The following table shows which option groups the server and startup scripts read from option files.

Table 2.13 MySQL Startup Scripts and Supported Server Option Groups

Script	Option Groups
mysqld	`[mysqld]`, `[server]`, `[mysqld-major_version]`
mysqld_safe	`[mysqld]`, `[server]`, `[mysqld_safe]`
mysql.server	`[mysqld]`, `[mysql.server]`, `[server]`

[mysqld-major_version] means that groups with names like [mysqld-5.7] and [mysqld-8.0] are read by servers having versions 5.7.x, 8.0.x, and so forth. This feature can be used to specify options that can be read only by servers within a given release series.

For backward compatibility, mysql.server also reads the [mysql_server] group and mysqld_safe also reads the [safe_mysqld] group. To be current, you should update your option files to use the [mysql.server] and [mysqld_safe] groups instead.

For more information on MySQL configuration files and their structure and contents, see Section 4.2.6, “Using Option Files”.

2.10 Upgrading or Downgrading MySQL

2.10.1 Upgrading MySQL
2.10.2 Downgrading MySQL
2.10.3 Rebuilding or Repairing Tables or Indexes
2.10.4 Copying MySQL Databases to Another Machine

This section describes the steps to upgrade or downgrade a MySQL installation.

Upgrading is a common procedure, as you pick up bug fixes within the same MySQL release series or significant features between major MySQL releases. You perform this procedure first on some test systems to make sure everything works smoothly, and then on the production systems.

Downgrading is less common. Typically, you undo an upgrade because of some compatibility or performance issue that occurs on a production system, and was not uncovered during initial upgrade verification on the test systems. As with the upgrade procedure, perform and verify the downgrade procedure on some test systems first, before using it on a production system.

2.10.1 Upgrading MySQL

2.10.1.1 Changes Affecting Upgrades to MySQL 8.0
2.10.1.2 Upgrading MySQL with the MySQL Yum Repository
2.10.1.3 Upgrading MySQL with the MySQL APT Repository

MySQL Server 8.0 incorporates a global data dictionary containing information about database objects in transactional tables. In previous MySQL series, dictionary data was stored in metadata files and nontransactional system tables. This section describes how to upgrade your data directory from the file-based structure to the data-dictionary structure.

Important

The process described here requires that you upgrade to MySQL 8.0 from a MySQL 5.7 GA version (5.7.9 or higher). Upgrades from non-GA versions of MySQL 5.7 or from MySQL series preceding 5.7 are not supported.

After you upgrade, a data dictionary-enabled server entails some general operational differences; see Section 14.6, “Data Dictionary Usage Differences”.

Note

In the following discussion, MySQL commands that must be run using a MySQL account with administrative privileges include -u root on the command line to specify the MySQL root user. Commands that require a password for root also include a -p option. Because -p is followed by no option value, such commands prompt for the password. Type the password when prompted and press Enter.

SQL statements can be executed using the mysql command-line client (connect as root to ensure that you have the necessary privileges).

Upgrade Methods

Supported upgrade methods include:

In-Place Upgrade: Involves shutting down the old MySQL version, replacing the old MySQL binaries or packages with the new ones, restarting MySQL on the existing data directory, and running mysql_upgrade.
Logical Upgrade: Involves exporting existing data from the old MySQL version using mysqldump, installing the new MySQL version, loading the dump file into the new MySQL version, and running mysql_upgrade.

For in-place and logical upgrade procedures, see In-Place Upgrade, and Logical Upgrade.

If you run MySQL Server on Windows, refer to the upgrade procedure described in Section 2.3.8, “Upgrading MySQL on Windows”.

If your current MySQL installation was installed on an Enterprise Linux platform or Fedora using the MySQL Yum Repository, see Section 2.10.1.2, “Upgrading MySQL with the MySQL Yum Repository”.

If your current MySQL installation was installed on Ubuntu using the MySQL APT repository, see Section 2.10.1.3, “Upgrading MySQL with the MySQL APT Repository”.

Upgrade Paths

Upgrade is only supported between General Availability (GA) releases. For MySQL 8.0, it is required that you upgrade from a MySQL 5.7 GA release (5.7.9 or higher). Upgrades from non-GA releases of MySQL 5.7 are not supported. There are currently no GA releases available for MySQL 8.0.
Upgrade from MySQL 5.7 to 8.0 is supported. Upgrading to the latest release is recommended before upgrading to the next version. For example, upgrade to the latest MySQL 5.7 release before upgrading to MySQL 8.0.
Upgrade that skips versions is not supported. For example, upgrading directly from MySQL 5.6 to 8.0 is not supported.
Upgrade within a release series is supported. For example, upgrading from MySQL 8.0.x to 8.0.y is supported. Skipping a release is also supported. For example, upgrading from MySQL 8.0.x to 8.0.z is supported.

Before You Begin

Before upgrading, review the following information and perform the recommended steps:

Before upgrading, protect your data by creating a backup of your current databases and log files. The backup should include the mysql system database, which contains the MySQL data dictionary tables and system tables. See Section 7.2, “Database Backup Methods”.
Review the Release Notes which provide information about features that are new in the MySQL 8.0 or differ from those found in earlier MySQL releases. Some of these changes may result in incompatibilities.
For a description of MySQL server features that have been removed in MySQL 8.0, see Features Removed in MySQL 8.0. An upgrade requires changes with respect to those features if you use any of them.
For listings of MySQL server variables and options that have been added, deprecated, or removed in MySQL 8.0, see Section 1.5, “Server and Status Variables and Options Added, Deprecated, or Removed in MySQL 8.0”. If you use any of these items, an upgrade requires configuration changes.
Review Section 2.10.1.1, “Changes Affecting Upgrades to MySQL 8.0”. This section describes changes that may require action before or after upgrading.
If you use replication, review Section 18.4.3, “Upgrading a Replication Setup”.
If you use XA transactions with InnoDB, run XA RECOVER before upgrading to check for uncommitted XA transactions. If results are returned, either commit or rollback the XA transactions by issuing an XA COMMIT or XA ROLLBACK statement.
If your MySQL installation contains a large amount of data that might take a long time to convert after an in-place upgrade, you might find it useful to create a “dummy” database instance for assessing what conversions might be needed and the work involved to perform them. Make a copy of your MySQL instance that contains a full copy of the mysql database, plus all other databases without data. Run your upgrade procedure on this dummy instance to see what actions might be needed so that you can better evaluate the work involved when performing actual data conversion on your original database instance.
Rebuilding and reinstalling MySQL language interfaces is recommended whenever you install or upgrade to a new release of MySQL. This applies to MySQL interfaces such as PHP mysql extensions, the Perl DBD::mysql module, and the Python MySQLdb module.

Verifying Upgrade Prerequisites for Your MySQL 5.7 Installation

Before starting the MySQL 8.0 server to upgrade the data directory, it is very important to ensure the upgrade readiness of your installation by using your MySQL 5.7 server to perform several preliminary checks. The upgrade process may fail otherwise.

To perform the preliminary checks:

There must be no tables that use obsolete data types, obsolete functions, orphan .frm files, InnoDB tables that use nonnative partitioning, or triggers that have a missing or empty definer or an invalid creation context. (This context is indicated by the character_set_client, collation_connection, Database Collation attributes displayed by SHOW TRIGGERS or the INFORMATION_SCHEMA TRIGGERS table.) To identify tables and triggers that fail these requirements, execute this command:
```
mysqlcheck -u root -p --all-databases --check-upgrade
```
If mysqlcheck reports any errors, correct the issues.
There must be no partitioned tables that use a storage engine that does not have native partitioning support. To identify such tables, execute this query:
```
SELECT TABLE_SCHEMA, TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE ENGINE NOT IN ('innodb', 'ndbcluster')
AND CREATE_OPTIONS LIKE '%partitioned%';
```
Any table reported by the query must be altered to use InnoDB or be made nonpartitioned. To change a table storage engine to InnoDB, execute this statement:
```
ALTER TABLE table_name ENGINE = INNODB;
```
Note

For information about converting MyISAM tables to InnoDB, see Section 15.8.1.4, “Converting Tables from MyISAM to InnoDB”.

To make a partitioned table nonpartitioned, execute this statement:
```
ALTER TABLE table_name REMOVE PARTITIONING;
```

There must be no tables in the MySQL 5.7 mysql system database that have the same name as a table used by the MySQL 8.0 data dictionary. To identify tables with those names, execute this query:

SELECT TABLE_SCHEMA, TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE LOWER(TABLE_SCHEMA) = 'mysql'
and LOWER(TABLE_NAME) IN
(
'catalogs',
'character_sets',
'collations',
'column_type_elements',
'columns',
'dd_properties',
'events',
'foreign_key_column_usage',
'foreign_keys',
'index_column_usage',
'index_partitions',
'index_stats',
'indexes',
'parameter_type_elements',
'parameters',
'routines',
'schemata',
'st_spatial_reference_systems',
'table_partition_values',
'table_partitions',
'table_stats',
'tables',
'tablespace_files',
'tablespaces',
'triggers',
'view_routine_usage',
'view_table_usage'
);

Any tables reported by the query must be renamed (use RENAME TABLE). This may also entail changes to applications that use the affected tables.

There must be no tables that have foreign key constraint names longer than 64 characters. To identify tables with too-long constraint names, execute this query:
```
SELECT CONSTRAINT_SCHEMA, TABLE_NAME, CONSTRAINT_NAME
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS
WHERE LENGTH(CONSTRAINT_NAME) > 64;
```
Any tables reported by the query must be altered to have constraint names no longer than 64 characters (use ALTER TABLE).
Your MySQL 5.7 installation must not use features that are not supported by MySQL 8.0. Any changes here are necessarily installation specific, but the following examples illustrate the kind of things to look for:
- Tables that use a storage engine not supported in MySQL 8.0 must be altered to use a supported engine.
  Example: MySQL 8.0 does not yet support MySQL Cluster, so NDB tables must be altered to use a different storage engine.
- Some server startup options and system variables have been removed in MySQL 8.0. See Features Removed in MySQL 8.0, and Section 1.5, “Server and Status Variables and Options Added, Deprecated, or Removed in MySQL 8.0”. If you use any of these items, an upgrade requires configuration changes.
  Example: Because the data dictionary provides information about database objects, the server no longer checks directory names in the data directory to find databases. Consequently, the --ignore-db-dir option is extraneous and has been removed. To handle this, remove any instances of --ignore-db-dir from your startup configuration. In addition, remove or move the named data directory subdirectories before upgrading to MySQL 8.0. (Alternatively, let the 8.0 server add those directories to the data dictionary as databases, then remove each of those databases using DROP DATABASE.)

In-Place Upgrade

This section describes how to perform an in-place upgrade. Before proceeding, review Before You Begin, and ensure that your installation is upgrade-ready by following the procedure given in Verifying Upgrade Prerequisites for Your MySQL 5.7 Installation.

Note

If you upgrade an installation originally produced by installing multiple RPM packages, upgrade all the packages, not just some. For example, if you previously installed the server and client RPMs, do not upgrade just the server RPM.

For some Linux platforms, MySQL installation from RPM or Debian packages includes systemd support for managing MySQL server startup and shutdown. On these platforms, mysqld_safe is not installed. In such cases, use systemd for server startup and shutdown instead of the methods used in the following instructions. See Section 2.5.9, “Managing MySQL Server with systemd”.

To perform an in-place upgrade:

Review the changes described in Section 2.10.1.1, “Changes Affecting Upgrades to MySQL 8.0” for steps to be performed before upgrading.
With your MySQL 5.7 server, if there are encrypted InnoDB tablespaces, rotate the keyring master key by executing this statement:
```
ALTER INSTANCE ROTATE INNODB MASTER KEY;
```
If you normally run your MySQL 5.7 server configured with innodb_fast_shutdown set to 2 (cold shutdown), configure it to perform a fast or slow shutdown by executing either of these statements:
```
SET GLOBAL innodb_fast_shutdown = 1; -- fast shutdown
SET GLOBAL innodb_fast_shutdown = 0; -- slow shutdown
```
With a fast or slow shutdown, InnoDB leaves its undo logs and data files in a state that can be dealt with in case of file format differences between releases.
Shut down the old MySQL server. For example:
```
mysqladmin -u root -p shutdown
```
Upgrade the MySQL binary installation or packages. If upgrading a binary installation, unpack the new MySQL binary distribution package. See Obtain and Unpack the Distribution. For package-based installations, replace the old packages with the new ones.

Note

For supported Linux distributions, the preferred method for replacing the MySQL packages is to use the MySQL software repositories; see Section 2.10.1.2, “Upgrading MySQL with the MySQL Yum Repository”, Section 2.10.1.3, “Upgrading MySQL with the MySQL APT Repository”, or Upgrading MySQL with the MySQL SLES Repository for instructions.
Start the MySQL 8.0 server, using the existing data directory. For example:
```
mysqld_safe --user=mysql --datadir=/path/to/existing-datadir
```
If there are encrypted InnoDB tablespaces, use the --early-plugin-load option to load the keyring plugin.
The server automatically detects whether data dictionary tables are present. If not, the server creates them in the data directory, populates them with metadata, and then proceeds with its normal startup sequence. During this process, the server upgrades metadata for all database objects, including databases, tablespaces, system and user tables, views, and stored programs (stored procedures and functions, triggers, Event Scheduler events). The server also removes files that previously were used for metadata storage. For example, after upgrading, you will notice that your tables no longer have .frm files.
If this step succeeds, the server performs a cleanup:
- In the data directory, the server creates a directory named backup_metadata_57 and moves into it files named db.opt and files with a suffix of .frm, .par, .TRG, .TRN, or .isl. (These are files previously used for metadata storage.)
  Files in the backup_metadata_57 directory retain the original file system hierarchy. For example, if t1.frm was located in the my_schema1 directory under the data directory, the server moves it to the backup_metadata_57/my_schema1 directory.
- In the mysql database, the server renames the event and proc tables to event_backup_57 and proc_backup_57.
If this step fails, the server reverts all changes to the data directory. In this case, you should remove all redo log files, start your MySQL 5.7 server on the same data directory, and fix the cause of any errors. Then perform another slow shutdown of the 5.7 server and start the MySQL 8.0 server to try again.
After the MySQL 8.0 server starts successfully, execute mysql_upgrade:
```
mysql_upgrade -u root -p
```
mysql_upgrade examines all tables in all databases for incompatibilities with the current version of MySQL. It makes any remaining changes required in the mysql system database between MySQL 5.7 and MySQL 8.0, so that you can take advantage of new privileges or capabilities. mysql_upgrade also brings the Performance Schema, INFORMATION_SCHEMA, and sys schema objects up to date for MySQL 8.0.

Note

mysql_upgrade should not be used when the server is running with --gtid-mode=ON. See GTID mode and mysql_upgrade for more information.
mysql_upgrade does not upgrade the contents of the help tables. For upgrade instructions, see Section 5.1.10, “Server-Side Help”.
Shut down and restart the MySQL server to ensure that any changes made to the system tables take effect. For example:
```
mysqladmin -u root -p shutdown
mysqld_safe --user=mysql --datadir=/path/to/existing-datadir
```
The first time you started the MySQL 8.0 server (in an earlier step), you may have noticed that it wrote several messages to its error log regarding nonupgraded tables. If mysql_upgrade has been run successfully, there should be no such messages the second time you start the server.

Logical Upgrade

This section describes how to perform a logical upgrade. Before proceeding, review Before You Begin, and ensure that your installation is upgrade-ready by following the procedure given in Verifying Upgrade Prerequisites for Your MySQL 5.7 Installation.

Note

To perform a logical upgrade:

Review the changes described in Section 2.10.1.1, “Changes Affecting Upgrades to MySQL 8.0” for steps to be performed before upgrading.
With your MySQL 5.7 server, use mysqldump to export your data:
```
mysqldump -u root -p
  --add-drop-table --routines --events --all-databases
  --ignore-table=mysql.innodb_table_stats
  --ignore-table=mysql.innodb_index_stats
  --force > data-for-upgrade.sql
```
The --routines and --events options must be given explicitly to include stored routines and events as object definitions in the dump file. Otherwise, they will appear only as rows in the mysql.proc and mysql.event tables, which will not be used in MySQL 8.0 when the dump file is reloaded (definitions for the corresponding objects are expected to be stored in data dictionary tables instead).
You can omit the --ignore-table options; the dump file will still reload later if you include the --force option on the load command. However, in that case, be prepared to see several warnings when those two tables load, which you should ignore.
Shut down the old MySQL server. For example:
```
mysqladmin -u root -p shutdown
```
Install MySQL 8.0. For installation instructions, see Chapter 2, Installing and Upgrading MySQL.
Initialize a new data directory, as described at Section 2.9.1, “Initializing the Data Directory”. For example:
```
mysqld --initialize --datadir=/path/to/8.0-datadir
```
Copy the temporary 'root'@'localhost' password displayed to your screen or written to your error log for later use.
Start the MySQL 8.0 server, using the new data directory. For example:
```
mysqld_safe --user=mysql --datadir=/path/to/8.0-datadir
```
If there are encrypted InnoDB tablespaces, use the --early-plugin-load option to load the keyring plugin.

Reset the temporary root password:

shell> mysql -u root -p
Enter password: ****  <- enter temporary root password
mysql> ALTER USER USER() IDENTIFIED BY 'your new password';

Load the previously created dump file into the new MySQL server. For example:
```
mysql -u root -p --force < data-for-upgrade.sql
```
If you did not specify --ignore-table options to suppress dumping the mysql.event and mysql.proc tables for the earlier mysqldump command, they will reappear when you reload the dump file.
After loading the dump file, execute mysql_upgrade:
```
mysql_upgrade -u root -p
```
mysql_upgrade examines all tables in all databases for incompatibilities with the current version of MySQL. It makes any remaining changes required in the mysql system database between MySQL 5.7 and MySQL 8.0, so that you can take advantage of new privileges or capabilities. mysql_upgrade also brings the Performance Schema, INFORMATION_SCHEMA, and sys schema objects up to date for MySQL 8.0.

Note

mysql_upgrade should not be used when the server is running with --gtid-mode=ON. See GTID mode and mysql_upgrade for more information.
mysql_upgrade does not upgrade the contents of the help tables. For upgrade instructions, see Section 5.1.10, “Server-Side Help”.
Shut down and restart the MySQL server to ensure that any changes made to the system tables take effect. For example:
```
mysqladmin -u root -p shutdown
mysqld_safe --user=mysql --datadir=/path/to/8.0-datadir
```

Upgrade Troubleshooting

If problems occur, such as that the new mysqld server does not start, verify that you do not have an old my.cnf file from your previous installation. You can check this with the --print-defaults option (for example, mysqld --print-defaults). If this command displays anything other than the program name, you have an active my.cnf file that affects server or client operation.
If, after an upgrade, you experience problems with compiled client programs, such as Commands out of sync or unexpected core dumps, you probably have used old header or library files when compiling your programs. In this case, check the date for your mysql.h file and libmysqlclient.a library to verify that they are from the new MySQL distribution. If not, recompile your programs with the new headers and libraries. Recompilation might also be necessary for programs compiled against the shared client library if the library major version number has changed (for example, from libmysqlclient.so.15 to libmysqlclient.so.16).
If you have created a user-defined function (UDF) with a given name and upgrade MySQL to a version that implements a new built-in function with the same name, the UDF becomes inaccessible. To correct this, use DROP FUNCTION to drop the UDF, and then use CREATE FUNCTION to re-create the UDF with a different nonconflicting name. The same is true if the new version of MySQL implements a built-in function with the same name as an existing stored function. See Section 9.2.4, “Function Name Parsing and Resolution”, for the rules describing how the server interprets references to different kinds of functions.

2.10.1.1 Changes Affecting Upgrades to MySQL 8.0

Before upgrading to MySQL 8.0, review the changes described in this section to identify upgrade issues that apply to your current MySQL installation and applications.

Note

In addition to the changes outlined in this section, review the Release Notes and other important information outlined in Before You Begin.

Changes marked as either Known issue or Incompatible change are incompatibilities with earlier versions of MySQL, and may require your attention before you upgrade. Our aim is to avoid these changes, but occasionally they are necessary to correct problems that would be worse than an incompatibility between releases. If any upgrade issue applicable to your installation involves an incompatibility that requires special handling, follow the instructions given in the incompatibility description. Sometimes this involves dumping and reloading tables, or use of a statement such as CHECK TABLE or REPAIR TABLE.

For dump and reload instructions, see Section 2.10.3, “Rebuilding or Repairing Tables or Indexes”. Any procedure that involves REPAIR TABLE with the USE_FRM option must be done before upgrading. Use of this statement with a version of MySQL different from the one used to create the table (that is, using it after upgrading) may damage the table. See Section 13.7.2.5, “REPAIR TABLE Syntax”.

Data Dictionary Changes

Incompatible change: MySQL Server 8.0 incorporates a global data dictionary containing information about database objects in transactional tables. In previous MySQL series, dictionary data was stored in metadata files and nontransactional system tables. As a result, the upgrade procedure is somewhat different from previous MySQL releases and requires that you verify the upgrade readiness of your installation by checking specific prerequisites. For more information, see Verifying Upgrade Prerequisites for Your MySQL 5.7 Installation. A data dictionary-enabled server entails some general operational differences; see Section 14.6, “Data Dictionary Usage Differences”.

Configuration Changes

Incompatible change: A MySQL storage engine is now responsible for providing its own partitioning handler, and the MySQL server no longer provides generic partitioning support. InnoDB is the only storage engine providing a native partitioning handler that is supported in MySQL 8.0. (The NDB storage engine also provides native partitioning support, but it is not yet supported in MySQL 8.0.) A partitioned table using any other storage engine must be altered—either to convert it to InnoDB, or to remove its partitioning—before upgrading the server, else it cannot be used afterwards.
For information about converting MyISAM tables to InnoDB, see Section 15.8.1.4, “Converting Tables from MyISAM to InnoDB”.
A table creation statement that would result in a partitioned table using a storage engine without such support fails with an error (ER_CHECK_NOT_IMPLEMENTED) in MySQL 8.0. If you import databases from a dump file created in MySQL 5.7 (or earlier) using mysqldump into a MySQL 8.0 server, you must make sure that any statements creating partitioned tables do not also specify an unsupported storage engine, either by removing any references to partitioning, or by specifying the storage engine as InnoDB or allowing it to be set as InnoDB by default.

Note

The procedure given at Verifying Upgrade Prerequisites for Your MySQL 5.7 Installation, describes how to identify partitioned tables that must be altered before upgrading to MySQL 8.0.

See Section 22.6.2, “Partitioning Limitations Relating to Storage Engines”, for further information.
Incompatible change: Several server error codes are not used and have been removed (for a list, see Features Removed in MySQL 8.0). Applications that test specifically for any of them should be updated.

Server Changes

Several spatial functions were removed in MySQL 8.0.0 due to a spatial function namespace change that implemented an ST_ prefix for functions that perform an exact operation, or an MBR prefix for functions that perform an operation based on minimum bounding rectangles. The use of removed spatial functions in generated column definitions could cause an upgrade failure. Before upgrading, run mysqlcheck --check-upgrade for removed spatial functions and replace any that you find with their ST_ or MBR named replacements. For a list of removed spatial functions, refer to Features Removed in MySQL 8.0.

InnoDB Changes

Incompatible change: Due to redo log format differences, performing an in-place upgrade to MySQL 8.0 from MySQL 5.7 requires that MySQL 5.7 be shut down using an innodb_fast_shutdown setting of 1 or 0 before upgrading. (It is required that you upgrade from a GA version of MySQL 5.7; that is, 5.7.9 or higher. Upgrades from non-GA versions of MySQL 5.7 are not supported.) Performing a shutdown using innodb_fast_shutdown set to 1 or 0 is a required step in In-Place Upgrade.

INFORMATION_SCHEMA views based on InnoDB system tables were replaced by internal system views on data dictionary tables. Affected InnoDB INFORMATION_SCHEMA views were renamed:

Table 2.14 Renamed InnoDB Information Schema Views

Old Name	New Name
`INNODB_SYS_COLUMNS`	`INNODB_COLUMNS`
`INNODB_SYS_DATAFILES`	`INNODB_DATAFILES`
`INNODB_SYS_FIELDS`	`INNODB_FIELDS`
`INNODB_SYS_FOREIGN`	`INNODB_FOREIGN`
`INNODB_SYS_FOREIGN_COLS`	`INNODB_FOREIGN_COLS`
`INNODB_SYS_INDEXES`	`INNODB_INDEXES`
`INNODB_SYS_TABLES`	`INNODB_TABLES`
`INNODB_SYS_TABLESPACES`	`INNODB_TABLESPACES`
`INNODB_SYS_TABLESTATS`	`INNODB_TABLESTATS`
`INNODB_SYS_VIRTUAL`	`INNODB_VIRTUAL`

After upgrading to MySQL 8.0.3 or later, update any scripts that reference previous InnoDB INFORMATION_SCHEMA view names.

SQL Changes

Some keywords may be reserved in MySQL 8.0 that were not reserved in MySQL 5.7. See Section 9.3, “Keywords and Reserved Words”. This can cause words previously used as identifiers to become illegal. To fix affected statements, use identifier quoting. See Section 9.2, “Schema Object Names”.
After upgrading, it is recommended that you test optimizer hints specified in application code to ensure that the hints are still required to achieve the desired optimization strategy. Optimizer enhancements can sometimes render certain optimizer hints unnecessary. In some cases, an unnecessary optimizer hint may even be counterproductive.

2.10.1.2 Upgrading MySQL with the MySQL Yum Repository

For supported Yum-based platforms (see Section 2.5.1, “Installing MySQL on Linux Using the MySQL Yum Repository”, for a list), you can perform an in-place upgrade for MySQL (that is, replacing the old version and then running the new version off the old data files) with the MySQL Yum repository.

Notes

Before performing any update to MySQL, follow carefully the instructions in Section 2.10.1, “Upgrading MySQL”. Among other instructions discussed there, it is especially important to back up your database before the update.
The following instructions assume you have installed MySQL with the MySQL Yum repository or with an RPM package directly downloaded from MySQL Developer Zone's MySQL Download page; if that is not the case, following the instructions in Replacing a Third-Party Distribution of MySQL Using the MySQL Yum Repository.

Selecting a Target Series

By default, the MySQL Yum repository updates MySQL to the latest version in the release series you have chosen during installation (see Selecting a Release Series for details), which means, for example, a 5.7.x installation will NOT be updated to a 8.0.x release automatically. To update to another release series, you need to first disable the subrepository for the series that has been selected (by default, or by yourself) and enable the subrepository for your target series. To do that, see the general instructions given in Selecting a Release Series. For upgrading from MySQL 5.7 to 8.0, perform the reverse of the steps illustrated in Selecting a Release Series, disabling the subrepository for the MySQL 5.7 series and enabling that for the MySQL 8.0 series.
As a general rule, to upgrade from one release series to another, go to the next series rather than skipping a series. For example, if you are currently running MySQL 5.6 and wish to upgrade to 8.0, upgrade to MySQL 5.7 first before upgrading to 8.0.

Important

For important information about upgrading from MySQL 5.7 to 8.0, see Upgrading from MySQL 5.7 to 8.0.
Upgrading MySQL

Upgrade MySQL and its components by the following command, for platforms that are not dnf-enabled:
```
sudo yum update mysql-server
```
For platforms that are dnf-enabled:
```
sudo dnf upgrade mysql-server
```
Alternatively, you can update MySQL by telling Yum to update everything on your system, which might take considerably more time; for platforms that are not dnf-enabled:
```
sudo yum update
```
For platforms that are dnf-enabled:
```
sudo dnf upgrade
```
Restarting MySQL

The MySQL server always restarts after an update by Yum. Once the server restarts, run mysql_upgrade to check and possibly resolve any incompatibilities between the old data and the upgraded software. mysql_upgrade also performs other functions; see Section 4.4.5, “mysql_upgrade — Check and Upgrade MySQL Tables” for details.

You can also update only a specific component. Use the following command to list all the installed packages for the MySQL components (for dnf-enabled systems, replace yum in the command with dnf):

sudo yum list installed | grep "^mysql"

After identifying the package name of the component of your choice, for platforms that are not dnf-enabled, update the package with the following command, replacing package-name with the name of the package:

sudo yum update package-name

For dnf-enabled platforms:

sudo dnf upgrade package-name

Upgrading the Shared Client Libraries

After updating MySQL using the Yum repository, applications compiled with older versions of the shared client libraries should continue to work.

If you recompile applications and dynamically link them with the updated libraries: As typical with new versions of shared libraries where there are differences or additions in symbol versioning between the newer and older libraries (for example, between the newer, standard 8.0 shared client libraries and some older—prior or variant—versions of the shared libraries shipped natively by the Linux distributions' software repositories, or from some other sources), any applications compiled using the updated, newer shared libraries will require those updated libraries on systems where the applications are deployed. And, as expected, if those libraries are not in place, the applications requiring the shared libraries will fail. So, be sure to deploy the packages for the shared libraries from MySQL on those systems. You can do this by adding the MySQL Yum repository to the systems (see Adding the MySQL Yum Repository) and install the latest shared libraries using the instructions given in Installing Additional MySQL Products and Components with Yum.

2.10.1.3 Upgrading MySQL with the MySQL APT Repository

On Debian and Ubuntu platforms, you can perform an in-place upgrade of MySQL and its components with the MySQL APT repository. See Upgrading MySQL with the MySQL APT Repository in A Quick Guide to Using the MySQL APT Repository.

2.10.2 Downgrading MySQL

2.10.2.1 Changes Affecting Downgrades from MySQL 8.0

This section describes how to downgrade to an older MySQL version.

Note

SQL statements can be executed using the mysql command-line client (connect as root to ensure that you have the necessary privileges).

Downgrade Methods

Supported downgrade methods include:

In-Place Downgrade: Involves shutting down the new MySQL version, replacing the new MySQL binaries or packages with the old ones, and restarting the old MySQL version on the existing data directory. In-place downgrades are supported for downgrades between GA versions within the same release series.
Logical Downgrade: Involves using mysqldump to dump all tables from the new MySQL version, and then loading the dump file into the old MySQL version. Logical downgrades are supported for downgrades between GA versions within the same release series and for downgrades between release levels.

Note

In-place downgrades are not supported for MySQL APT, SLES, and Yum repository installations.

For procedures, see In-Place Downgrade, and Logical Downgrade.

Downgrade Paths

Downgrade is only supported between General Availability (GA) releases. There are currently no GA releases available for MySQL 8.0.
Downgrade from MySQL 8.0 to 5.7 is supported using the logical downgrade method.
Downgrade that skips versions is not supported. For example, downgrading directly from MySQL 8.0 to 5.6 is not supported.
Downgrade within a release series is supported. For example, downgrading from MySQL 8.0.z to 8.0.y is supported. Skipping a release is also supported. For example, downgrading from MySQL 8.0.z to 8.0.x is supported.

Before You Begin

Before downgrading, the following steps are recommended:

Review the Release Notes for the MySQL version you are downgrading from to ensure that there are no features or fixes that you really need.
Review Section 2.10.2.1, “Changes Affecting Downgrades from MySQL 8.0”. This section describes changes that may require action before or after downgrading.

Note

The downgrade procedures described in the following sections assume you are downgrading with data files created or modified by the newer MySQL version. However, if you did not modify your data after upgrading, downgrading using backups taken before upgrading to the new MySQL version is recommended. Many of the changes described in Section 2.10.2.1, “Changes Affecting Downgrades from MySQL 8.0” that require action before or after downgrading are not applicable when downgrading using backups taken before upgrading to the new MySQL version.
Always back up your current databases and log files before downgrading. The backup should include the mysql database, which contains the MySQL system tables. See Section 7.2, “Database Backup Methods”.
Use of new features, new configuration options, or new configuration option values that are not supported by a previous release may cause downgrade errors or failures. Before downgrading, it is recommended that you reverse changes resulting from the use of new features and remove configuration settings that are not supported by the release you are downgrading to.
If you use XA transactions with InnoDB, run XA RECOVER before downgrading to check for uncommitted XA transactions. If results are returned, either commit or rollback the XA transactions by issuing an XA COMMIT or XA ROLLBACK statement.

In-Place Downgrade

In-place downgrades are supported for downgrades between GA releases within the same release series. Before proceeding, review Before You Begin.

Warning

For a supported downgrade path within the MySQL 8.0 release series, there must be at least two MySQL 8.0 GA releases available.

Note

To perform an in-place downgrade:

Review the changes described in Section 2.10.2.1, “Changes Affecting Downgrades from MySQL 8.0” for steps to be performed before downgrading.
Shut down the newer MySQL server. For example:
```
mysqladmin -u root -p shutdown
```
Downgrade the MySQL binaries or packages in-place by replacing the newer binaries or packages with the older ones.
Start the older (downgraded) MySQL server, using the existing data directory. For example:
```
mysqld_safe --user=mysql --datadir=/path/to/existing-datadir
```
Run mysql_upgrade. For example:
```
mysql_upgrade -u root -p
```
mysql_upgrade examines all tables in all databases for incompatibilities with the current version of MySQL, and attempts to repair the tables if problems are found.
Shut down and restart the MySQL server to ensure that any changes made to the system tables take effect. For example:
```
mysqladmin -u root -p shutdown
mysqld_safe --user=mysql --datadir=/path/to/existing-datadir
```

Logical Downgrade

Logical downgrades are supported for downgrades between releases within the same release series and for downgrades to the previous release level. Only downgrades between General Availability (GA) releases are supported. Before proceeding, review Before You Begin.

Note

For MySQL APT, SLES, and Yum repository installations, only downgrades to the previous release level are supported. Where the instructions call for initializing an older instance, use the package management utility to remove MySQL 8.0 packages and install MySQL 5.7 packages.

To perform a logical downgrade:

Review the changes described in Section 2.10.2.1, “Changes Affecting Downgrades from MySQL 8.0” for steps to be performed before downgrading.

Dump all databases. For example:

mysqldump -u root -p
  --add-drop-table --routines --events
  --all-databases --force > data-for-downgrade.sql

Shut down the newer MySQL server. For example:
```
mysqladmin -u root -p shutdown
```
Initialize an older MySQL instance, with a new data directory. For example:
```
mysqld --initialize --user=mysql
```
Start the older MySQL server, using the new data directory. For example:
```
mysqld_safe --user=mysql --datadir=/path/to/new-datadir
```
Load the dump file into the older MySQL server. For example:
```
mysql -u root -p --force < data-for-upgrade.sql
```
Run mysql_upgrade. For example:
```
mysql_upgrade -u root -p
```
mysql_upgrade examines all tables in all databases for incompatibilities with the current version of MySQL, and attempts to repair the tables if problems are found.
Shut down and restart the MySQL server to ensure that any changes made to the system tables take effect. For example:
```
mysqladmin -u root -p shutdown
mysqld_safe --user=mysql --datadir=/path/to/new-datadir
```

Downgrade Troubleshooting

If you downgrade from one release series to another, there may be incompatibilities in table storage formats. In this case, use mysqldump to dump your tables before downgrading. After downgrading, reload the dump file using mysql or mysqlimport to re-create your tables. For examples, see Section 2.10.4, “Copying MySQL Databases to Another Machine”.

A typical symptom of a downward-incompatible table format change when you downgrade is that you cannot open tables. In that case, use the following procedure:

Stop the older MySQL server that you are downgrading to.
Restart the newer MySQL server you are downgrading from.
Dump any tables that were inaccessible to the older server by using mysqldump to create a dump file.
Stop the newer MySQL server and restart the older one.
Reload the dump file into the older server. Your tables should be accessible.

2.10.2.1 Changes Affecting Downgrades from MySQL 8.0

Before downgrading from MySQL 8.0, review the changes described in this section. Some changes may require action before or after downgrading.

System Table Changes

In MySQL 8.0.2, the system tables in the mysql system database were migrated from individual tablespace files to a single tablespace file (mysql.ibd). Before downgrading to MySQL 5.7, move the mysql system tables back to individual tablespace files by running the following statements:

ALTER TABLE mysql.columns_priv TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.component TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.db TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.default_roles TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.engine_cost TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.func TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.general_log TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.global_grants TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.gtid_executed TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.help_category TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.help_keyword TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.help_relation TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.help_topic TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.innodb_index_stats TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.innodb_table_stats TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.plugin TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.procs_priv TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.proxies_priv TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.role_edges TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.server_cost TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.servers TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.slave_master_info TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.slave_relay_log_info TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.slave_worker_info TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.slow_log TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.tables_priv TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.time_zone TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.time_zone_leap_second TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.time_zone_name TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.time_zone_transition TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.time_zone_transition_type TABLESPACE=innodb_file_per_table;
ALTER TABLE mysql.user TABLESPACE=innodb_file_per_table;

In MySQL 8.0.2, six system tables changed from MyISAM to InnoDB. Before downgrading to MySQL 5.7, change each table back to MyISAM by running the following statements:

ALTER TABLE mysql.columns_priv ENGINE='MyISAM' STATS_PERSISTENT=DEFAULT
ALTER TABLE mysql.db ENGINE='MyISAM' STATS_PERSISTENT=DEFAULT;
ALTER TABLE mysql.procs_priv ENGINE='MyISAM' STATS_PERSISTENT=DEFAULT;
ALTER TABLE mysql.proxies_priv ENGINE='MyISAM' STATS_PERSISTENT=DEFAULT;
ALTER TABLE mysql.tables_priv ENGINE='MyISAM' STATS_PERSISTENT=DEFAULT;
ALTER TABLE mysql.user ENGINE='MyISAM' STATS_PERSISTENT=DEFAULT;

In MySQL 8.0.2, two columns were added to the mysql.user table. Before downgrading to MySQL 5.7, remove these columns by running the following statements:
```
ALTER TABLE mysql.user drop Create_role_priv;
ALTER TABLE mysql.user drop Drop_role_priv;
```

InnoDB Changes

Incompatible change: Before performing an in-place downgrade from MySQL 8.0 to 5.7, you must shutdown MySQL using an innodb_fast_shutdown setting of 0 or 1 followed by removal of the redo log files (the ib_logfile* files). Performing a shutdown using innodb_fast_shutdown=0 and removing the redo logs are recommended steps in In-Place Downgrade.

2.10.3 Rebuilding or Repairing Tables or Indexes

This section describes how to rebuild or repair tables or indexes, which may be necessitated by:

Changes to how MySQL handles data types or character sets. For example, an error in a collation might have been corrected, necessitating a table rebuild to update the indexes for character columns that use the collation.
Required table repairs or upgrades reported by CHECK TABLE, mysqlcheck, or mysql_upgrade.

Methods for rebuilding a table include:

Dump and Reload Method

If you are rebuilding tables because a different version of MySQL will not handle them after a binary (in-place) upgrade or downgrade, you must use the dump-and-reload method. Dump the tables before upgrading or downgrading using your original version of MySQL. Then reload the tables after upgrading or downgrading.

If you use the dump-and-reload method of rebuilding tables only for the purpose of rebuilding indexes, you can perform the dump either before or after upgrading or downgrading. Reloading still must be done afterward.

If you need to rebuild an InnoDB table because a CHECK TABLE operation indicates that a table upgrade is required, use mysqldump to create a dump file and mysql to reload the file. If the CHECK TABLE operation indicates that there is a corruption or causes InnoDB to fail, refer to Section 15.20.2, “Forcing InnoDB Recovery” for information about using the innodb_force_recovery option to restart InnoDB. To understand the type of problem that CHECK TABLE may be encountering, refer to the InnoDB notes in Section 13.7.2.2, “CHECK TABLE Syntax”.

To rebuild a table by dumping and reloading it, use mysqldump to create a dump file and mysql to reload the file:

mysqldump db_name t1 > dump.sql
mysql db_name < dump.sql

To rebuild all the tables in a single database, specify the database name without any following table name:

mysqldump db_name > dump.sql
mysql db_name < dump.sql

To rebuild all tables in all databases, use the --all-databases option:

mysqldump --all-databases > dump.sql
mysql < dump.sql

ALTER TABLE Method

To rebuild a table with ALTER TABLE, use a “null” alteration; that is, an ALTER TABLE statement that “changes” the table to use the storage engine that it already has. For example, if t1 is an InnoDB table, use this statement:

ALTER TABLE t1 ENGINE = InnoDB;

If you are not sure which storage engine to specify in the ALTER TABLE statement, use SHOW CREATE TABLE to display the table definition.

REPAIR TABLE Method

The REPAIR TABLE method is only applicable to MyISAM, ARCHIVE, and CSV tables.

You can use REPAIR TABLE if the table checking operation indicates that there is a corruption or that an upgrade is required. For example, to repair a MyISAM table, use this statement:

REPAIR TABLE t1;

mysqlcheck --repair provides command-line access to the REPAIR TABLE statement. This can be a more convenient means of repairing tables because you can use the --databases or --all-databases option to repair all tables in specific databases or all databases, respectively:

mysqlcheck --repair --databases db_name ...
mysqlcheck --repair --all-databases

2.10.4 Copying MySQL Databases to Another Machine

In cases where you need to transfer databases between different architectures, you can use mysqldump to create a file containing SQL statements. You can then transfer the file to the other machine and feed it as input to the mysql client.

Use mysqldump --help to see what options are available.

The easiest (although not the fastest) way to move a database between two machines is to run the following commands on the machine on which the database is located:

mysqladmin -h 'other_hostname' create db_name
mysqldump db_name | mysql -h 'other_hostname' db_name

If you want to copy a database from a remote machine over a slow network, you can use these commands:

mysqladmin create db_name
mysqldump -h 'other_hostname' --compress db_name | mysql db_name

You can also store the dump in a file, transfer the file to the target machine, and then load the file into the database there. For example, you can dump a database to a compressed file on the source machine like this:

mysqldump --quick db_name | gzip > db_name.gz

Transfer the file containing the database contents to the target machine and run these commands there:

mysqladmin create db_name
gunzip < db_name.gz | mysql db_name

You can also use mysqldump and mysqlimport to transfer the database. For large tables, this is much faster than simply using mysqldump. In the following commands, DUMPDIR represents the full path name of the directory you use to store the output from mysqldump.

First, create the directory for the output files and dump the database:

mkdir DUMPDIR
mysqldump --tab=DUMPDIR db_name

Then transfer the files in the DUMPDIR directory to some corresponding directory on the target machine and load the files into MySQL there:

mysqladmin create db_name           # create database
cat DUMPDIR/*.sql | mysql db_name   # create tables in database
mysqlimport db_name DUMPDIR/*.txt   # load data into tables

Do not forget to copy the mysql database because that is where the grant tables are stored. You might have to run commands as the MySQL root user on the new machine until you have the mysql database in place.

After you import the mysql database on the new machine, execute mysqladmin flush-privileges so that the server reloads the grant table information.

2.11 Perl Installation Notes

2.11.1 Installing Perl on Unix
2.11.2 Installing ActiveState Perl on Windows
2.11.3 Problems Using the Perl DBI/DBD Interface

The Perl DBI module provides a generic interface for database access. You can write a DBI script that works with many different database engines without change. To use DBI, you must install the DBI module, as well as a DataBase Driver (DBD) module for each type of database server you want to access. For MySQL, this driver is the DBD::mysql module.

Note

Perl support is not included with MySQL distributions. You can obtain the necessary modules from http://search.cpan.org for Unix, or by using the ActiveState ppm program on Windows. The following sections describe how to do this.

The DBI/DBD interface requires Perl 5.6.0, and 5.6.1 or later is preferred. DBI does not work if you have an older version of Perl. You should use DBD::mysql 4.009 or higher. Although earlier versions are available, they do not support the full functionality of MySQL 8.0.

2.11.1 Installing Perl on Unix

MySQL Perl support requires that you have installed MySQL client programming support (libraries and header files). Most installation methods install the necessary files. If you install MySQL from RPM files on Linux, be sure to install the developer RPM as well. The client programs are in the client RPM, but client programming support is in the developer RPM.

The files you need for Perl support can be obtained from the CPAN (Comprehensive Perl Archive Network) at http://search.cpan.org.

The easiest way to install Perl modules on Unix is to use the CPAN module. For example:

shell> perl -MCPAN -e shell
cpan> install DBI
cpan> install DBD::mysql

The DBD::mysql installation runs a number of tests. These tests attempt to connect to the local MySQL server using the default user name and password. (The default user name is your login name on Unix, and ODBC on Windows. The default password is “no password.”) If you cannot connect to the server with those values (for example, if your account has a password), the tests fail. You can use force install DBD::mysql to ignore the failed tests.

DBI requires the Data::Dumper module. It may be installed; if not, you should install it before installing DBI.

It is also possible to download the module distributions in the form of compressed tar archives and build the modules manually. For example, to unpack and build a DBI distribution, use a procedure such as this:

Unpack the distribution into the current directory:
```
shell> gunzip < DBI-VERSION.tar.gz | tar xvf -
```
This command creates a directory named DBI-VERSION.
Change location into the top-level directory of the unpacked distribution:
```
shell> cd DBI-VERSION
```

Build the distribution and compile everything:

shell> perl Makefile.PL
shell> make
shell> make test
shell> make install

The make test command is important because it verifies that the module is working. Note that when you run that command during the DBD::mysql installation to exercise the interface code, the MySQL server must be running or the test fails.

It is a good idea to rebuild and reinstall the DBD::mysql distribution whenever you install a new release of MySQL. This ensures that the latest versions of the MySQL client libraries are installed correctly.

If you do not have access rights to install Perl modules in the system directory or if you want to install local Perl modules, the following reference may be useful: http://learn.perl.org/faq/perlfaq8.html#How-do-I-keep-my-own-module-library-directory-

2.11.2 Installing ActiveState Perl on Windows

On Windows, you should do the following to install the MySQL DBD module with ActiveState Perl:

Get ActiveState Perl from http://www.activestate.com/Products/ActivePerl/ and install it.
Open a console window.
If necessary, set the HTTP_proxy variable. For example, you might try a setting like this:
```
C:\> set HTTP_proxy=my.proxy.com:3128
```
Start the PPM program:
```
C:\> C:\perl\bin\ppm.pl
```
If you have not previously done so, install DBI:
```
ppm> install DBI
```
If this succeeds, run the following command:
```
ppm> install DBD-mysql
```

This procedure should work with ActiveState Perl 5.6 or higher.

If you cannot get the procedure to work, you should install the ODBC driver instead and connect to the MySQL server through ODBC:

use DBI;
$dbh= DBI->connect("DBI:ODBC:$dsn",$user,$password) ||
  die "Got error $DBI::errstr when connecting to $dsn\n";

2.11.3 Problems Using the Perl DBI/DBD Interface

If Perl reports that it cannot find the ../mysql/mysql.so module, the problem is probably that Perl cannot locate the libmysqlclient.so shared library. You should be able to fix this problem by one of the following methods:

Copy libmysqlclient.so to the directory where your other shared libraries are located (probably /usr/lib or /lib).
Modify the -L options used to compile DBD::mysql to reflect the actual location of libmysqlclient.so.
On Linux, you can add the path name of the directory where libmysqlclient.so is located to the /etc/ld.so.conf file.
Add the path name of the directory where libmysqlclient.so is located to the LD_RUN_PATH environment variable. Some systems use LD_LIBRARY_PATH instead.

Note that you may also need to modify the -L options if there are other libraries that the linker fails to find. For example, if the linker cannot find libc because it is in /lib and the link command specifies -L/usr/lib, change the -L option to -L/lib or add -L/lib to the existing link command.

If you get the following errors from DBD::mysql, you are probably using gcc (or using an old binary compiled with gcc):

/usr/bin/perl: can't resolve symbol '__moddi3'
/usr/bin/perl: can't resolve symbol '__divdi3'

Add -L/usr/lib/gcc-lib/... -lgcc to the link command when the mysql.so library gets built (check the output from make for mysql.so when you compile the Perl client). The -L option should specify the path name of the directory where libgcc.a is located on your system.

Another cause of this problem may be that Perl and MySQL are not both compiled with gcc. In this case, you can solve the mismatch by compiling both with gcc.

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