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Re: Each morning some SQLs are very slow
Posted by: Øystein Grøvlen
Date: May 09, 2017 12:13AM


Since you mention 5.5 and full text search, I assume you are using MyISAM storage engine for the data. MyISAM relies on the file system for caching, so it may be that other activity on the computer during the night will cause MyISAM files to no longer be cached. Hence, data may have to be read from disk each morning.

If using MyISAM, please consider changing to InnoDB. In MySQL 5.7, InnoDB supports full text search, and should give you better control over how data is cached.

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

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Re: Each morning some SQLs are very slow
May 09, 2017 12:13AM

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