Question

我创建了一个非常复杂的存储过程，用于检查c_sent_messages表中是否存在c_passwords表中的密码。然后，它输入一些消息并更新数据库中的记录。最后，它正在从c_sent_messages到archive表中输入记录。在我将添加记录的两行添加到archive并从c_sent_messages删除消息之前，一切都很好（不增加存储空间）

INSERT INTO archive SELECT *, NOW() FROM c_sent_messages WHERE id=idi;          
DELETE FROM c_sent_messages WHERE  id=idi;

我的处理器也是一个很好的处理器（Intel 7700 HQ），我没有运行任何其他软件/进程。在添加这两行之后，该过程花费了太多时间才能将记录添加到archive表中。我想最小化此过程的处理时间。有什么方法可以使其更快？（向archive添加1000条记录需要120秒）


DELIMITER $$
CREATE PROCEDURE flood () 
BEGIN
DECLARE i INT DEFAULT 0;
    declare ifExist int DEFAULT 0;
    DECLARE numara VARCHAR(10);
    declare adamin_gonderdigi varchar(150);
  declare idi int default 0;


    myloop: LOOP




      SET idi               = (SELECT id  from c_sent_messages where stats = 'N' limit 1);
        SET numara            = (SELECT sender  from c_sent_messages where id = idi);
        SET adamin_gonderdigi = (SELECT msg_text from c_sent_messages WHERE id = idi);

      select count(1) into ifExist from c_passwords b WHERE adamin_gonderdigi = b.pass;

        IF ifExist > 0 THEN
            set ifExist = 0;
                select count(1) into ifExist from c_sent_messages a WHERE a.stats ="N";
                IF ifExist > 0 THEN
                    INSERT INTO c_received_messages ( receiver, sender, msg_text, stats, x_date )
                        VALUES
                            (numara, "5757", "Code is received successfully.", "S",NOW());
                    UPDATE c_passwords a SET a.stats = "S", a.x_date = NOW()
                    WHERE pass = adamin_gonderdigi;         

                        update c_sent_messages set stats = 'S' where id = idi;

                ELSE

                    INSERT INTO c_received_messages ( receiver, sender, msg_text, stats, x_date )
                    VALUES(numara,"5757","Code is used before!","S",NOW());

                    update c_sent_messages set stats = 'U' where id = idi;

                END IF; 

        ELSE 
            INSERT INTO c_received_messages  ( receiver, sender, msg_text, stats, x_date )
            VALUES(numara,"5757","Please send a valid code!","S",NOW());

            update c_sent_messages set stats = 'F' where id = idi;
        END IF;     

        INSERT INTO archive SELECT *, NOW() FROM c_sent_messages WHERE id = idi;            
        DELETE FROM c_sent_messages WHERE  id=idi;

    SET i = i + 1;
        IF
            i = 900000 THEN
                LEAVE myloop;

        END IF;     
    END LOOP myloop;

END $$
DELIMITER;

Answer 1

循环的3个SELECT可以通过单个SELECT完成-参见JOIN。
您有INDEX(stats, id)吗？
查看IODKU是否可以替换您的选择/如果/插入/更新序列。
尝试在单个SQL语句中完成整个过程，而无需循环900000次。

如何减少程序的处理时间？

1 个答案: