Invalidating query cache entries mysql

Second, the query cache can be operated in 3 modes only: on, off, and on-demand.

If you're using the most current version, select the documentation for that version with the version switch in the upper right corner of the online documentation, or by downloading a newer PDF or EPUB file.

So if it's storing those query results then it's completely worthless because chances are no one is going to run that same exact query again.

I ran SHOW STATUS LIKE "Qcache%" and the results were: Qcache_free_blocks 6941 Qcache_free_memory 23490288 Qcache_hits 253269763 Qcache_inserts 368937684 Qcache_lowmem_prunes 57410566 Qcache_not_cached 9872266 Qcache_queries_in_cache 35275 Qcache_total_blocks 84877 I don't really know what those things mean or if they are even useful in determining whether or not I need to reset the cache. The manual didn't lie to you, any queries which alter data in a table invalidate any cache entries that reference that table. If your data is updated so often that queries would never last in the cache, or the same query is run so infrequently that it's not useful to cache it, then you're just wasting huge amounts of memory and CPU time checking and invalidating cache entries on every Is there a way to turn off the query cache just for selected tables?

The classic tip is “set global query_cache_size=0” .

It often happens to see and hear of replication SQL thread almost always in state “invalidating query cache entries (table)” .

The Query Cache is strictly related to Entities, and it draws an association between a search criterion and the Entities fulfilling that specific query filter.

That is, even if the query cache is not enabled, the mutex (slow, by nature) to access the (not existing) query cache is acquired for every binlog event.Cacheable Result [email protected] is null Standard Query Cache - Query results were not found in cache select querycache0_as id1_1_, querycache0_.author_id as author_i4_1_, querycache0_.created_on as created_2_1_, querycache0_as name3_1_ from Post querycache0_ order by querycache0_.created_on desc limit 10 Standard Query Cache - Caching query results in region: org.hibernate.cache.internal.Standard Query Cache; timestamp=5872026465492992 Ehcache General Data Region - key: sql: select querycache0_as id1_1_, querycache0_.author_id as author_i4_1_, querycache0_.created_on as created_2_1_, querycache0_as name3_1_ from Post querycache0_ order by querycache0_.created_on desc; parameters: ; named parameters: ; max rows: 10; transformer: org.hibernate.transform.Cacheable Result [email protected] value: [5872026465492992, 1] Jdbc Transaction - committed JDBC Connection ------------------------------------------------------------ Query Cache Test - Check get entity is cached Jdbc Transaction - committed JDBC Connection ------------------------------------------------------------ Query Cache Test - Check query is cached Standard Query Cache - Checking cached query results in region: org.hibernate.cache.internal.Standard Query Cache Standard Query Cache - Checking query spaces are up-to-date: [Post] Ehcache General Data Region - key: Post Update Timestamps Cache - [Post] last update timestamp: 5872026465406976, result set timestamp: 5872026465492992 Standard Query Cache - Returning cached query results Jdbc Transaction - committed JDBC Connection Ehcache General Data Region - key: sql: select querycache0_as id1_1_, querycache0_.author_id as author_i4_1_, querycache0_.created_on as created_2_1_, querycache0_as name3_1_ from Post querycache0_ inner join Author querycache1_ on querycache0_.author_id=querycache1_where querycache1_.id=?

Invalidating query cache entries mysql