Re: How to get rid of 'filesort'?
Posted by:
Rick James
Date: March 01, 2010 04:51PM
See if this will solve it:
INDEX(shop_id, status, product_id)
That gets all the WHERE clauses for p, and they are "=", followed by the field needed for GROUP BY. So, if it decides to start with p, it should avoid the much maligned "filesort".
The real problem is not "filesort" but rather JOINing tables and filtering on fields in more than one of them.
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Re: How to get rid of 'filesort'?
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