Re: Very slow query when too many joins
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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Re: Very slow query when too many joins
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