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Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
Posted by: Thomas Frederiksen
Date: December 27, 2011 10:28AM

Just to follow up on this topic. This particular query was fixed by dropping the idx_start_date and letting it use another index (gkey) that results in a filesort but significantly faster execution time.

I'm now putting together a new test case that also has the performance problem. I've since had to downgrade to 5.1.51 in order to keep things afloat. I've left our slave on 5.5.18 in order to be able to show execution plans from both versions.

I'll post again when I can put all of the information together.


RAM: 48GB

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Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
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Thomas Frederiksen
December 21, 2011 01:32PM
Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
1133
Rick James
December 22, 2011 11:34PM
Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
1127
Thomas Frederiksen
December 27, 2011 10:28AM
Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
1353
Thomas Frederiksen
December 30, 2011 12:52PM
Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
1206
Rick James
December 31, 2011 11:12AM
Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
1438
Sen Thiru
January 07, 2012 06:30PM
Re: Mysql 5.1 to 5.5.1.18 Upgrade Poor Performance
1328
Thomas Frederiksen
December 30, 2011 01:30PM


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