Invalidating query cache entries key mysql
The query mutex becomes a very hot spot especially if you are using RBR.In fact, with RBR there is a binlog event for each modified row, thus the mutex is acquired for every row. 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 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).
The recording and slides for the webinar are available here.To avoid this issue, you need to keep the query cache small (not larger than 512 MB) and de-fragment it from time to time using the FLUSH QUERY CACHE command.
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