Re: MySQL 5.6 update doubled IOs
The explain for the 5.6 version of the query says that it will be "Using MRR". This might not be good for "LIMIT 1" query. Can you try to run the query when support for MRR is disabled, eg. by adding:
set optimizer_switch='mrr=off';
to see if this has any impact on the performance.
Best regards,
Olav
Subject
Views
Written By
Posted
3162
March 18, 2013 08:33AM
1263
March 19, 2013 08:58AM
1245
March 20, 2013 08:52AM
1218
March 21, 2013 09:51AM
1346
March 26, 2013 08:29AM
1327
March 27, 2013 11:11AM
1146
March 27, 2013 11:44PM
1178
March 28, 2013 02:17AM
1200
March 28, 2013 09:55AM
1770
March 29, 2013 02:20AM
1362
March 29, 2013 06:30AM
1261
March 29, 2013 06:56AM
1193
March 29, 2013 07:18AM
1162
March 29, 2013 07:49AM
1189
March 29, 2013 08:08AM
1152
March 29, 2013 10:07AM
1182
March 28, 2013 07:49PM
1208
March 29, 2013 01:23AM
Re: MySQL 5.6 update doubled IOs
1108
April 02, 2013 12:20AM
1170
April 02, 2013 12:30AM
1266
April 02, 2013 12:44AM
1117
April 02, 2013 02:23AM
1151
April 02, 2013 09:57PM
1215
April 03, 2013 12:46AM
1419
April 03, 2013 03:29AM
1163
April 05, 2013 01:57AM
1198
April 05, 2013 06:24AM
1112
April 10, 2013 08:12AM
1130
April 10, 2013 08:31AM
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.