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Re: query with bad performance after migration to mysql 5.6
Posted by: Øystein Grøvlen
Date: December 09, 2015 03:22AM

Hi Walter,

In order to understand better what is going on here, it would be useful if you could provide optimizer trace for this query in MySQL 5.6. (See https://dev.mysql.com/doc/internals/en/optimizer-tracing.html for information on how to generate the trace.) Also, the output of EXPLAIN FORMAT=JSON could be useful to understand how the sorting is performed.

Thanks,

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

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Re: query with bad performance after migration to mysql 5.6
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