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My SQL query cache is a cache mechanism that stores the text of the query (e.g.'SELECT * FROM users WHERE deleted = 0') and the result of the query into memory.Even for big Word Press sites, most likely percentage of SELECT queries will be much higher as compared to INSERT or UPDATE.Best way is to monitor query cache efficiency using mysqltuner.

They can, however, be configured to regularly expire cached data.Second level cache does not store instances of an entity, instead it caches only entity identifier and values.Each entity class, collection association and query has its region, where values of each instance are stored.As with content caching, it is most effective in read-heavy scenarios.The My SQL query cache in particular should not be relied upon for performance as it is easy to invalidate large segments of the cache with minor changes to data. ] Query cache is disabled” when running mysqltuner.