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Re: Year and month partitioning
Posted by: Mattias Jonsson
Date: March 02, 2011 03:13AM

MONTH is not optimized for RANGE pruning, it will only prune on exact queries like 'WHERE dataTime = '2011-03-02 00:01:02' (or by walking max 32 steps IIRC).

Note that in 5.5 you can also use
PARTITION BY RANGE COLUMNS(dataTime)
(PARTITION p201101 VALUES LESS THAN ('2011-02-01 00:00:00'),
...)
i.e use the column directly without having to use TO_DAYS().

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