mysql 多分区，自动化分区脚本

Posted 2023-02-25 TT_DUL

**以下为mysql 自动化分区脚本，但是要配合mysql 事件去触发 的，详细为每天一个分区，每个月的11号去增加下一个月的所有分区，格式具体 为： add partition(partition p20160601 values less than (20160601235959));

另外特别特别要注意的是要查看你的mysql 是否启用了 事件
show variables like ‘%scheduler%’;
如果没有启用，那么此时需要到mysql配置文件my.cnf新增一项，在mysqld后面添加event_scheduler = on（或是event_scheduler = 1），保存后重启mysql服务器即可。

当然也可以使用 *
set global event_scheduler = on;*

1、自动化分区脚本

DELIMITER $$

DROP PROCEDURE IF EXISTS `xxx`.`create_Partition`$$

CREATE DEFINER=`root`@`%` PROCEDURE `create_Partition`(IN databaseName VARCHAR(50),IN tableName VARCHAR(50))
L_END:BEGIN       
     DECLARE MAX_PARTITION_DESCRIPTION VARCHAR(255) DEFAULT 0;  
     DECLARE P_NAME VARCHAR(255) DEFAULT 0;         
     DECLARE P_DESCRIPTION VARCHAR(255) DEFAULT 0;     
     DECLARE i INT DEFAULT 1;  
     DECLARE ISEXIST_PARTITION VARCHAR(255) DEFAULT 0;   
        DECLARE MONTH_DAYS VARCHAR(5);
        DECLARE YEAR_NUM VARCHAR(10);
        DECLARE MONTH_NUM VARCHAR(5);
     SELECT PARTITION_NAME INTO ISEXIST_PARTITION FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = databaseName AND TABLE_NAME = tableName  LIMIT 1 ;  

     IF ISEXIST_PARTITION <=> "" THEN  
       SELECT "Partition table not is exist" AS "*****ERROR*****";  
       LEAVE  L_END;  
     END IF;  

     SELECT partition_description INTO MAX_PARTITION_DESCRIPTION  FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = databaseName AND TABLE_NAME = tableName ORDER BY partition_description DESC LIMIT 1;  


     IF MAX_PARTITION_DESCRIPTION <=> "" THEN  
       SELECT "Partition table is error" AS "*****ERROR*****";  
       LEAVE  L_END;  
     END IF;  


        select day(last_day(date_add(NOW(), interval 1 MONTH)))into MONTH_DAYS;

    SET MAX_PARTITION_DESCRIPTION = REPLACE(MAX_PARTITION_DESCRIPTION, '\\'', '');  
    WHILE i <= MONTH_DAYS DO  
                        select date_format(date_add(last_day(NOW()),interval i day),'%Y%m%d') into P_DESCRIPTION;
          ## SET P_DESCRIPTION = adddate(MAX_PARTITION_DESCRIPTION, INTERVAL i day);  
           SET P_NAME = REPLACE(P_DESCRIPTION, '-', '');  
           SET @S=CONCAT('ALTER TABLE ',tableName,' ADD PARTITION  (PARTITION p',P_NAME,' VALUES LESS THAN (',P_DESCRIPTION,'235959))');  
           SELECT @S;  
           PREPARE stmt2 FROM @S;  
           EXECUTE stmt2;  
           DEALLOCATE PREPARE stmt2;  
           SET i = i + 1 ;  
    END WHILE;            
END L_END$$

DELIMITER ;

2、mysql 自动化分区脚本触发事件

DELIMITER $$
CREATE DEFINER=`root`@`%` EVENT `auto_set_partitions` ON SCHEDULE EVERY 1 MONTH STARTS '2016-06-11 17:18:00' ON COMPLETION PRESERVE ENABLE DO BEGIN  
        CALL create_Partition('xxx','testable')$$  


    END

DELIMITER ;