Invalidating query cache entries table

the global Were the size and type set to 0 when the server was started, or later?From the bug reports, it seems to make a difference...

invalidating query cache entries table-67

If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open".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).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.

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