[英]How to change all tables engines from MYISAM to INNODB in multiple databses?
我知道我可以單獨發出一個更改表來將表存儲從 MyISAM 更改為 InnoDB。
我想知道是否有辦法快速將它們全部更改為 InnoDB?
這是一次性任務。
用
SELECT CONCAT(TABLE_SCHEMA, '.', TABLE_NAME) tablename
FROM INFORMATION_SCHEMA.TABLES
WHERE ENGINE = 'MyISAM'
AND TABLE_SCHEMA IN (databases names list);
獲取表列表,構建 ALTERing 腳本,然后手動執行。
這個操作以存儲過程的形式存在。 未測試!!!
CREATE PROCEDURE alter_engines ()
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE cur CURSOR FOR
SELECT CONCAT('ALTER TABLE ' , TABLE_SCHEMA, '.', TABLE_NAME, ' ENGINE = InnoDB;')
FROM INFORMATION_SCHEMA.TABLES
WHERE ENGINE = 'MyISAM'
/* do not forget */
AND TABLE_SCHEMA IN (databases names list);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN cur;
alter_loop: LOOP
FETCH cur INTO @sql;
IF done THEN
LEAVE alter_loop;
END IF;
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END LOOP;
CLOSE cur;
END;
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