MySQL Chooses Non-Optimal Index for Partitioned Table in MySQL 5.1.43 and Later and MySQL 5.5
Last updated on MARCH 08, 2017
Applies to:MySQL Server - Version 5.1 to 5.5 [Release 5.1 to 5.5]
Information in this document applies to any platform.
A bad index choice is made for a table with more than around 10 partitions.
If you have upgraded from 5.1.42 or earlier to a later version, the index choice may have changed after the upgrade.
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