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If you set it to on demand, then you have to explicitly state which queries you want cached when you issue them.

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I haven't touched anything such as reseting query cache for the year that the game has been up, I'm working with about 5000-1million rows depending on the table.

Everything is being updated constantly and things being inserted into the tables.

that lets you specify either the number of milliseconds after which an entity instance should expire from the cache, or a time of day that all instances of the entity class should expire from the cache.

Expiry is set on the When an instance expires, it is only invalidated in the cache.

If your query cache is large, your SELECT queries may be noticeably slowed waiting on a response from the query cache while it’s busy removing invalidated queries by some other thread.

You’ll also be wasting valuable memory on a cache you’re not using while you could be allocating that memory to more valuable buffers or caches, to the application, or to the operating system.

It is not removed from the cache, but when next accessed it will be refreshed from the database as part of the query that was used to access it.

The application can also explicitly invalidate objects in the cache using the JPA API.

In theory, the cache exists to speed up your application by responding to the same query with results directly from memory instead of parsing, optimizing, and re-executing the query against the database.

However, the query cache is only useful in certain scenarios.

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?

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