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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
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DELIMITER ||
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DROP PROCEDURE IF EXISTS create_Partition ||
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CREATE PROCEDURE create_Partition (IN databaseName VARCHAR(50),IN tableName VARCHAR(50))
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L_END:BEGIN
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DECLARE MAX_PARTITION_DESCRIPTION VARCHAR(255) DEFAULT 0;
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DECLARE P_NAME VARCHAR(255) DEFAULT 0;
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DECLARE P_DESCRIPTION VARCHAR(255) DEFAULT 0;
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DECLARE i INT DEFAULT 1;
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DECLARE ISEXIST_PARTITION VARCHAR(255) DEFAULT 0;
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SELECT PARTITION_NAME INTO ISEXIST_PARTITION FROM information_schema.PARTITIONS WHERE TABLE_SCHEMA = databaseName AND TABLE_NAME = tableName LIMIT 1 ;
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IF ISEXIST_PARTITION <=> "" THEN
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SELECT "Partition table not is exist" AS "*****ERROR*****";
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LEAVE L_END;
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END IF;
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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;
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IF MAX_PARTITION_DESCRIPTION <=> "" THEN
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SELECT "Partition table is error" AS "*****ERROR*****";
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LEAVE L_END;
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END IF;
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SET MAX_PARTITION_DESCRIPTION = REPLACE(MAX_PARTITION_DESCRIPTION, '\'', '');
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WHILE i <= 15 DO
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SET P_DESCRIPTION = adddate(MAX_PARTITION_DESCRIPTION, INTERVAL i day);
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SET P_NAME = REPLACE(P_DESCRIPTION, '-', '');
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SET @S=CONCAT('ALTER TABLE ',tableName,' ADD PARTITION (PARTITION p',P_NAME,' VALUES LESS THAN (\'',P_DESCRIPTION,'\'))');
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SELECT @S;
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PREPARE stmt2 FROM @S;
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EXECUTE stmt2;
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DEALLOCATE PREPARE stmt2;
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SET i = i + 1 ;
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END WHILE;
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END L_END;||
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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
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DELIMITER ||
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CREATE EVENT auto_set_partitions
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ON SCHEDULE
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EVERY 15 DAY
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DO
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BEGIN
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CALL create_Partition('database_name','table_name');
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/* 如果需要向多个表分区,可以写多个 CALL 调用
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CALL create_Partition('database_name','table_name');
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*/
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END ||
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DELIMITER ;
这个事件每隔15天执行一次.
(责任编辑：IT) |
