MySQL每天自动增加分区

有一个表tb_3a_huandan_detail，每天有300W左右的数据。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 ;  

参考：

http://blog.csdn.net/m582445672/article/details/7670743

http://blog.chinaunix.net/uid-24086995-id-127389.html