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roles/mariadb: Disable the query cache by default

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It seems that the usefulness of the query cache is diminishing in
recent years. If your cache is large then the time taken to scan
the cache can be longer than the SQL query itself.

See: https://haydenjames.io/mysql-query-cache-size-performance/
This commit is contained in:
Alan Orth 2020-12-29 11:07:33 +02:00
parent 67a18c4f49
commit 8ee52143fc
Signed by: alanorth
GPG Key ID: 0FB860CC9C45B1B9
2 changed files with 6 additions and 4 deletions
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4
roles/mariadb/defaults/main.yml
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@ -23,4 +23,8 @@ mariadb_login_unix_socket: /var/run/mysqld/mysqld.sock
# default is 100 but the max I've seen used is 5, so let's reduce it # default is 100 but the max I've seen used is 5, so let's reduce it
max_connections: 33 max_connections: 33
# disable the query cache by default
query_cache_size: 0
query_cache_type: 0
# vim: set ts=2 sw=2: # vim: set ts=2 sw=2:

6
roles/mariadb/templates/my.cnf.j2
View File

@ -75,11 +75,9 @@ read_rnd_buffer_size = 1M
# #
# * Query Cache Configuration # * Query Cache Configuration
# #
# Cache only tiny result sets, so we can fit more in the query cache.
query_cache_limit = 128K query_cache_limit = 128K
query_cache_size = 64M query_cache_size = {{ query_cache_size }}
# for more write intensive setups, set to DEMAND or OFF query_cache_type = {{ query_cache_type }}
#query_cache_type = DEMAND
# #
# * Logging and Replication # * Logging and Replication
# #