MySQL每天自動增加分區

有一個表tb_3a_huandan_detail，每天有300W左右的數據。查詢太慢了，網上了解了一下，可以做表分區。由於數據較大，所以決定做定時任務每天執行存過自動進行分區。

1、在進行自動增加分區前一定得先對表手動分幾個區

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、分區存過如下：

DELIMITER $$

USE `nres`$$

DROP PROCEDURE IF EXISTS `create_Partition_3Ahuadan`$$

CREATE DEFINER=`nres`@`%` PROCEDURE `create_Partition_3Ahuadan`()
BEGIN
/* 事務回滾，其實放這里沒什么作用，ALTER TABLE是隱式提交，回滾不了的。*/
    DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
    START TRANSACTION;
 
/* 到系統表查出這個表的最大分區，得到最大分區的日期。在創建分區的時候，名稱就以日期格式存放，方便后面維護 */
    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，在最大分區的后面增加一個分區，時間范圍加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),''')))');
    /* 輸出查看增加分區語句*/
    SELECT @s1;
    PREPARE stmt2 FROM @s1;
    EXECUTE stmt2;
    DEALLOCATE PREPARE stmt2;
/* 取出最小的分區的名稱，並刪除掉 。
    注意：刪除分區會同時刪除分區內的數據，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、增加定時事件

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 ;  

 

參考：

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

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