一、使用說明:
1.此腳本爲分區後,定時自動增加分區.(被自動分區的表,一定要先手動分幾個區)
2.每隔15天,定時器會執行一個存儲過程,對分區日期最後的那天再往後新增15個分區.
3.Script裏面Auto_partitions.sql 爲存儲過程
4.Script裏面Timer_event.sql 爲定時事件腳本
5.MySQL5.5默認並沒有開啓EVENT機制,需要在my.cnf文件中添加[mysqld] event_scheduler= ON
7.增加打開文件上線.這個很重要.open_files_limit = 5000
二、分區腳本
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 ;
# 其中傳入參數databaseName爲數據庫名,參數tableName爲表名.
三、添加事件處理
DELIMITER ||
CREATE EVENT auto_set_partitions
ON SCHEDULE
EVERY 15 DAY
DO
BEGIN
CALL create_Partition('database_name','table_name');
/* 如果需要向多個表分區,可以寫多個 CALL 調用
CALL create_Partition('database_name','table_name');
*/
END ||
DELIMITER ;
這個事件每隔15天執行一次.