MySQL自动分区脚本

一、使用说明:
1.此脚本为分区后,定时自动增加分区.（被自动分区的表,一定要先手动分几个区）
2.每隔15天,定时器会执行一个存储过程,对分区日期最后的那天再往后新增15个分区.
3.Script里面Auto_partitions.sql 为存储过程
4.Script里面Timer_event.sql 为定时事件脚本
5.MySQL5.5默认并没有开启EVENT机制,需要在my.cnf文件中添加[mysqld] event_scheduler= ON
7.增加打开文件上线.这个很重要.open_files_limit = 5000

二、分区脚本

DELIMITER ||  DROP PROCEDURE IF EXISTS create_Partition ||  CREATE 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;        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;      SET MAX_PARTITION_DESCRIPTION = REPLACE(MAX_PARTITION_DESCRIPTION, '\'', '');      WHILE i <= 15 DO             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,'\'))');             SELECT @S;             PREPARE stmt2 FROM @S;             EXECUTE stmt2;             DEALLOCATE PREPARE stmt2;             SET i = i + 1 ;      END WHILE;            END L_END;||  DELIMITER ;  

# 其中传入参数databaseName为数据库名,参数tableName为表名.

三、添加事件处理

DELIMITER ||  CREATE EVENT auto_set_partitions            ON SCHEDULE            EVERY 15 DAY             DO        BEGIN            CALL create_Partition('database_name','table_name');           /* 如果需要向多个表分区,可以写多个 CALL 调用              CALL create_Partition('database_name','table_name');          */   END ||  DELIMITER ;  

这个事件每隔15天执行一次.