mysql表碎片清理

DELIMITER $$
USE `db`$$
DROP PROCEDURE IF EXISTS `optimize_table`$$
CREATE  PROCEDURE `optimize_table`()
BEGIN
    DECLARE tableSchema VARCHAR(100);
    DECLARE tableName VARCHAR(100);
    DECLARE stopFlag INT DEFAULT 0;
    -- 大于30%碎片率的清理
    DECLARE rs CURSOR FOR SELECT table_schema,table_name FROM information_schema.tables WHERE ((data_free/1024)/((data_length+index_length+data_free)/1024)) > 0.30;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET stopFlag = 1;
    OPEN rs;
        WHILE stopFlag <> 1 DO     
        FETCH NEXT FROM rs INTO tableSchema,tableName;
            IF stopFlag<>1 THEN 
                -- SET @table_optimize = CONCAT('ALTER TABLE `',tableName,'` ENGINE = INNODB');
                SET @table_optimize = CONCAT('OPTIMIZE TABLE `',table_schema,'`.`',tableName,'`');
                PREPARE sql_optimize FROM @table_optimize;    
                EXECUTE sql_optimize;
            END IF;
        END WHILE;
    CLOSE rs;
    END$$
DELIMITER ;