[MySQL] 分區表

和Oracle不一樣的是：MySQL沒有全局索引，只有分區索引，因此對於MySQL的分區表來說，限制比Oracle要多一些：

1、分區鍵必須是主鍵的一部分

2、分區鍵的數據類型必須是整形（包括時間類型）

3、分區鍵不能爲NULL

下面是一個基於時間的表分區定義：

PARTITION BY RANGE (TO_DAYS(START))
(
 PARTITION p201401 VALUES LESS THAN (TO_DAYS('20140201')),
 PARTITION p201402 VALUES LESS THAN (TO_DAYS('20140301')),
 PARTITION p201403 VALUES LESS THAN (TO_DAYS('20140401')),
 PARTITION p201404 VALUES LESS THAN (TO_DAYS('20140501')),
 PARTITION p201405 VALUES LESS THAN (TO_DAYS('20140601')),
 PARTITION p201406 VALUES LESS THAN (TO_DAYS('20140701')),
 PARTITION p201407 VALUES LESS THAN (TO_DAYS('20140801')),
 PARTITION p201408 VALUES LESS THAN (TO_DAYS('20140901')),
 PARTITION p201409 VALUES LESS THAN (TO_DAYS('20141001')),
 PARTITION p201410 VALUES LESS THAN (TO_DAYS('20141101')),
 PARTITION p201411 VALUES LESS THAN (TO_DAYS('20141201')),
 PARTITION p201412 VALUES LESS THAN (TO_DAYS('20150101')),
 PARTITION pmax VALUES LESS THAN maxvalue
);

關於MySQL的分區管理也沒有Oracle那麼強大，從5.6開始才支持分區交換。