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Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
Posted by: Rick James
Date: October 03, 2015 08:01PM

Interesting.

Please provide

SHOW CREATE TABLE

EXPLAIN SELECT (with ASC and with DESC)

And run this for each direction:
FLUSH STATUS;
SELECT ...
SHOW SESSION STATUS LIKE 'Handler%';

It would probably help to have the composite index:
INDEX(enabled, category)

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Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
2989
Ronald Brown
October 03, 2015 12:47AM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1560
Rick James
October 03, 2015 08:01PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1587
Ronald Brown
October 03, 2015 08:34PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1452
Rick James
October 05, 2015 10:38AM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1592
Rick James
October 05, 2015 10:41AM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1418
Ronald Brown
October 05, 2015 10:50AM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1479
Ronald Brown
October 04, 2015 08:28PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1383
Ronald Brown
October 05, 2015 12:26PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1610
Rick James
October 06, 2015 11:00AM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
3325
Ronald Brown
October 06, 2015 11:50PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1294
Rick James
October 07, 2015 08:12PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1326
Ronald Brown
October 08, 2015 11:17PM
Re: Why is ORDER BY ASC is slow but ORDER DESC is fast ? and how can i fix it ?
1587
Rick James
October 09, 2015 10:34PM


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