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Re: Very slow query when too many joins
Posted by: Rick James
Date: June 05, 2016 05:36PM

Here's my rant against EAV: http://mysql.rjweb.org/doc.php/eav

You do need a composite index on (ads_id, field_id). In particular it would be better to have
* ENGINE=InnoDB -- so that the PK is clustered
* PRIMARY KEY(ads_id, field_id)

In my.cnf :
optimizer_search_depth = 1

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