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Re: Query causing CPU Spike to 100% after MYSQL upgrade
Posted by: Øystein Grøvlen
Date: December 13, 2017 12:29PM

Could you provide the EXPLAIN output for the two queries. It may be caused by different join orders. I think the condition filtering estimate may be different for = and like. Hence, different join orders may come out as the best one.

I do not quite understand what is the role of the cfit and cft tables in this query. There does not seem to be any join condition that link them to the tables that provide columns to the result set.

Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway

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Re: Query causing CPU Spike to 100% after MYSQL upgrade
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