每天大约有三百万条数据存储在tb_3a_huandan_detail这个表中。查询太慢了，网上了解了一下，可以做表分区。由于数据较大，所以决定做定时任务每天执行存过自动进行分区。
1、在进行自动增加分区前一定得先对表手动分几个区
ALTER TABLE tb_3a_huandan_detail PARTITION BY RANGE (TO_DAYS(ServiceStartTime))
(
PARTITION p20160523 VALUES LESS THAN (TO_DAYS('2016-05-23')),
PARTITION p20160524 VALUES LESS THAN (TO_DAYS('2016-05-24')),
PARTITION p20160525 VALUES LESS THAN (TO_DAYS('2016-05-25')),
PARTITION p20160526 VALUES LESS THAN (TO_DAYS('2016-05-26')),
PARTITION p20160527 VALUES LESS THAN (TO_DAYS('2016-05-27'))
)2、分区存过如下：
DELIMITER $$
USE `nres`$$
DROP PROCEDURE IF EXISTS `create_Partition_3Ahuadan`$$
CREATE DEFINER=`nres`@`%` PROCEDURE `create_Partition_3Ahuadan`()
BEGIN
/* 事务回滚，其实放这里没什么作用，ALTER TABLE是隐式提交，回滚不了的。*/
DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
START TRANSACTION;
/* 到系统表查出这个表的最大分区，得到最大分区的日期。在创建分区的时候，名称就以日期格式存放，方便后面维护 */
SELECT REPLACE(partition_name,'p','') INTO @P12_Name FROM INFORMATION_SCHEMA.PARTITIONS
WHERE table_name='tb_3a_huandan_detail' ORDER BY partition_ordinal_position DESC LIMIT 1;
SET @Max_date= DATE(DATE_ADD(@P12_Name+0, INTERVAL 1 DAY))+0;
/* 修改表，在最大分区的后面增加一个分区，时间范围加1天 */
SET @s1=CONCAT('ALTER TABLE tb_3a_huandan_detail ADD PARTITION (PARTITION p',@Max_date,' VALUES LESS THAN (TO_DAYS (''',DATE(@Max_date),''')))');
/* 输出查看增加分区语句*/
SELECT @s1;
PREPARE stmt2 FROM @s1;
EXECUTE stmt2;
DEALLOCATE PREPARE stmt2;
/* 取出最小的分区的名称，并删除掉 。
注意：删除分区会同时删除分区内的数据，慎重 */
/*select partition_name into @P0_Name from INFORMATION_SCHEMA.PARTITIONS
where table_name='tb_3a_huandan_detail' order by partition_ordinal_position limit 1;
SET @s=concat('ALTER TABLE tb_3a_huandan_detail DROP PARTITION ',@P0_Name);
PREPARE stmt1 FROM @s;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1; */
/* 提交 */
COMMIT ;
END$$
DELIMITER ;3、增加定时事件
DELIMITER ||
CREATE EVENT Partition_3Ahuadan_event
ON SCHEDULE
EVERY 1 day STARTS '2016-05-27 23:59:59'
DO
BEGIN
CALL nres.`create_Partition_3Ahuadan`;
END ||
DELIMITER ; 
