MySQL自動分區腳本

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.