Comments - MyISAM plus INNODB enable query cache?

4 years, 10 months ago Daniel Black

mysqltuner will give you a result based on hitrate. What isn't accounted for is:

  • this the cost of the hit;
  • the cost of the lookup;
  • the cost of cache invalidation; or
  • if the query cache queries are actually just as quick to calculate without a cache.

If you have lots of threads_running you will have contention on the query cache lock QC is enabled.

You are probably better off measuring query response time overall in a production environment with and without query cache and making a decision based on that.

4 years, 10 months ago Chris Matthews

Thanks for your answer.

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