Invalidating query cache entries key radio carbon dating inaccuracies

Posted by / 15-Sep-2016 05:53

Yes we have Oliver Palotai now and he is a permanent member.And I think he had a couple of good offers to make some big tours again, so I was a little worried then, you know?Since they get invalidated so quickly, it seems to me the best thing would be to just use SQL_NO_CACHE on SELECT statements with these tables.Is the overhead of frequent invalidation ever worth it? The Query Cache will always butt heads with Inno DB.

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

The only way to not acquire the query cache mutex in My SQL pre-5.5 is to compile My SQL without query cache. For My SQL 5.5 , to completely disable the query cache (thus, not acquiring the query cache mutex) is required to set query_cache_type=OFF at startup (not at runtime).

That also means that if query_cache_type=OFF at startup, you need to restart My SQL if later you want to enable the query cache (you can’t enable it at runtime).

For Hibernate to cache a given query result, we need to explicitly set the cachable query attribute when creating the Query.

The Query Cache is read-through and like the NONSTRICT_READ_WRITE concurrency startegy, it can only invalidate stale entries.

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