MySQL Forums
Forum List  »  Performance

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

Options: ReplyQuote


Subject
Views
Written By
Posted
842
June 05, 2016 09:17AM
Re: Very slow query when too many joins
414
June 05, 2016 05:36PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.