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how to calculate a query's frequency ? I doubt that some query is very often,I want to know its pqs,can any body tell me ? I have tried using general log,is there any tool to figure out ?

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Plan A: Turn on the "general log" and use pt-query-digest to analyze the log.

Plan B: Set long_query_time = 0 and turn on the slowlog. Then use pt-query-digest to analyze the log.

Caution: In either case, disk will fill up fast.

With the slowlog you get a lot of other information -- useful if you are concerned about what is bogging down the system. That is a different question than 'frequency'; it is frequency * avg execution time.

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