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    <p>Ok so it appears that 5.5 runs the queries as quickly as 5.0, so we've rolled back to 5.5<br> Quite a complex issue, here are the resources I found to be helpful.</p> <p>Same issue as us possibly<br> <a href="https://stackoverflow.com/questions/17931246/slow-query-after-upgrade-mysql-from-5-5-to-5-6">Slow query after upgrade mysql from 5.5 to 5.6</a></p> <p>replace joins with STRAIGHT_JOIN everywhere?<br> <a href="https://stackoverflow.com/questions/19961013/percona-5-6-innodb-issue-not-using-indexes-correctly">Percona 5.6 InnoDB issue not using indexes correctly</a></p> <p>Suggests 5.6 is better than 5.5<br> <a href="https://stackoverflow.com/questions/16273573/mysql-long-running-query-in-5-5-is-very-fast-in-5-6">MySQL long running query in 5.5 is very fast in 5.6</a></p> <p>More about straight joins<br> <a href="https://stackoverflow.com/questions/512294/when-to-use-straight-join-with-mysql">When to use STRAIGHT_JOIN with MySQL</a></p> <p>More 5.6 configuration advice from the floor<br> <a href="https://www.facebook.com/notes/mysql-at-facebook/my-mysql-is-faster-than-your-mysql/10151250402570933" rel="nofollow noreferrer">https://www.facebook.com/notes/mysql-at-facebook/my-mysql-is-faster-than-your-mysql/10151250402570933</a><br> <a href="http://dev.mysql.com/doc/refman/5.6/en/performance-schema-configuration.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.6/en/performance-schema-configuration.html</a> <a href="http://www.percona.com/live/mysql-conference-2013/sites/default/files/slides/mysql-56-experiences-bugs-solutions-50mins.pdf" rel="nofollow noreferrer">http://www.percona.com/live/mysql-conference-2013/sites/default/files/slides/mysql-56-experiences-bugs-solutions-50mins.pdf</a></p> <p>Turn off MRR</p> <p>probably worth reading the optimizer parts of this page<br> <a href="http://dev.mysql.com/doc/refman/5.6/en/mysql-nutshell.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.6/en/mysql-nutshell.html</a><br> and all point releases back to 5.0</p> <p><a href="http://www.mysqlperformanceblog.com/2013/02/18/is-mysql-5-6-slower-than-mysql-5-5/" rel="nofollow noreferrer">http://www.mysqlperformanceblog.com/2013/02/18/is-mysql-5-6-slower-than-mysql-5-5/</a></p> <p><a href="http://dev.mysql.com/doc/refman/5.5/en/upgrading.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.5/en/upgrading.html</a></p> <p>Wow<br> <a href="http://mysqlentomologist.blogspot.co.uk/2013/06/fun-with-bugs-11-top-10-optimizer.html" rel="nofollow noreferrer">http://mysqlentomologist.blogspot.co.uk/2013/06/fun-with-bugs-11-top-10-optimizer.html</a></p> <p>Cheers</p>
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