mysql - MySQL/MariaDB 事件优化数据库表

Question

我有兴趣创建一个定期事件来每晚优化我的数据库表。

我得SELECT Concat('OPTIMIZE TABLE ', TABLE_NAME, ';') FROM INFORMATION_SCHEMA.TABLES WHERE table_schema='database_name';。如何在 MySQL 事件中执行每一行？

我更喜欢使用 MySQL / MariaDB 事件并且不涉及 bash。谢谢！

Answer 1

所以，这是您的查询。您只需要更改 SELECT 语句，然后就可以调用它

ELIMITER //
CREATE PROCEDURE p1()
BEGIN
  DECLARE done INT DEFAULT FALSE;
  DECLARE val VARCHAR(2000);
  DECLARE curs CURSOR FOR SELECT sqlstring FROM table_a;

  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

  OPEN curs;

  read_loop: LOOP
    FETCH curs INTO val;
    IF done THEN
      LEAVE read_loop;
    END IF;

  SET @sql := val;
  PREPARE stmt FROM @sql;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;

  END LOOP;

  CLOSE curs;
END; //

DELIMITER ;

叫它

调用 p1();

Answer 2

设法使其运行：

BEGIN
  DECLARE done INT DEFAULT FALSE;
  DECLARE val VARCHAR(2000);
  DECLARE curs CURSOR FOR SELECT Concat('OPTIMIZE TABLE ', TABLE_NAME, ';') FROM INFORMATION_SCHEMA.TABLES WHERE table_schema='database_name';

  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

  OPEN curs;

  read_loop: LOOP
    FETCH curs INTO val;
    IF done THEN
      LEAVE read_loop;
    END IF;

  SET @sql := val;
  PREPARE stmt FROM @sql;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;

  END LOOP;

  CLOSE curs;
END