Turning off the Query Cache works in Percona Server 5.1 , before MySQL Server 5.5

Posted in: Technical Track

In a previous blog post I wrote that is not possible to completely turn off the Query Cache in MySQL before 5.5 .

Although, it is possible to completely turn off the Query Cache with Percona Server 5.1 .

MySQL bug #38551 reports that the change is incompatible with MySQL 5.1 . In this case the incompatibily is only related to how the server behaves: if Query Cache is disabled at startup it  cannot be enable at runtime.

Thanks to Kenny Gryp from Percona for pointing this out and for the clarifications provided.

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