Improvements to MySQL optimiser
At its Open World conference, Oracle has presented a pre-release version of MySQL 5.6 that is called both "Developer Milestone Release 5.6.3" and "DMR 5.6 #2". The developers say that the optimiser has especially been given an overhaul in this milestone release. In a blog posting, Rob Young writes that the improvements enable MySQL to execute certain queries up to three times faster.
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