MySQL 5.6 Release Notes
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MySQL provides optimizer control through system variables that affect how query plans are evaluated, switchable optimizations, and index hints.
User Comments
Posted by
Richard Prout
on
July 30, 2008
I had a view with probably 20 joins in. tables typically only had 100 rows. query would initially take 20-30seconds. i set the optimiser search depth down to 3 and got that time down to 90ms.