7.3.7. cache_limit¶
7.3.7.1. Summary¶
cache_limit gets or sets the max number of query cache
entries. Query cache is used only by select command.
If the max number of query cache entries is 100, the recent 100
select commands are only cached. The cache expire algorithm is LRU
(least recently used).
7.3.7.2. Syntax¶
This command takes only one optional parameter:
cache_limit [max=null]
7.3.7.3. Usage¶
You can get the current max number of cache entries by executing
cache_limit without parameter.
Execution example:
cache_limit
# [[0, 1337566253.89858, 0.000355720520019531], 100]
You can set the max number of cache entries by executing cache_limit
with max parameter.
Here is an example that sets 10 as the max number of cache
entries.
Execution example:
cache_limit 10
# [[0, 1337566253.89858, 0.000355720520019531], 100]
cache_limit
# [[0, 1337566253.89858, 0.000355720520019531], 10]
If max parameter is used, the return value is the max number of
cache entries before max parameter is set.
7.3.7.4. Parameters¶
This section describes all parameters.
7.3.7.4.1. max¶
Specifies the max number of query cache entries as a number.
If max parameter isn’t specified, the current max number of query
cache entries isn’t changed. cache_limit just returns the current
max number of query cache entries.
7.3.7.5. Return value¶
cache_limit returns the current max number of query cache entries:
[HEADER, N_ENTRIES]
HEADER
See Output format about
HEADER.
N_ENTRIES
N_ENTRIESis the current max number of query cache entries. It is a number.