MYSQL慢速存储INSERT

分类：编程问答

如何解决MYSQL慢速存储INSERT

我正在将MSSQL DB迁移到MySQL。而且我有一个SP，可以在一个表中进行很多插入，它可以正常工作，但在Mysql中执行相同的过程会花费太多时间。我读到要插入很多东西并不能提高执行速度。

它的while循环在每个循环中进行插入。

我想知道您是否有更快的方法？

例如，当我在python中执行此操作时，我将ever select添加到列表中，并且在循环结束时，我仅插入了所有行的一个。我试图弄清楚如何在mysql SP中执行此操作。

这是SP，但是我不能在此处放置我调用的所有表。

CREATE DEFINER=`root`@`localhost` PROCEDURE `SP_indisp_cscs3`()
BEGIN
                                                            /*BORRA LA INFORMACION A SER REPROCESADA*/
    DELETE FROM indisp;
    /*WHERE mes = MONTH(CURDATE())
    AND año = YEAR(CURDATE());*/
                                                        /*Comienza la fiesta,se armó la culiandanga*/
                                                        
    SET @row  = (SELECT min(cscsID) from cscs where month(inicio) = month(curdate()) AND YEAR(inicio) = YEAR(curdate()));
    WHILE  @row <= (SELECT max(cscsID) from cscs ) DO
        SET @inicio = (SELECT inicio FROM cscs WHERE cscsid = @row); 
        SET @fin = (select   fin from cscs where cscsid = @row); 
        SET @hourini = @inicio;
        SET @compID = (select compID from cscs where cscsid = @row);
        SET @vencomp = (select ven_comp from cscs where cscsid = @row);
        SET @venserv = (select ven_serv from cscs where cscsid = @row);
            
        WHILE @inicio < @fin AND  MONTH(@inicio) = MONTH(CURDATE()) AND YEAR(@inicio) = YEAR(CURDATE()) DO
            
            INSERT INTO indisp (ticketid)/*,diasem,splitdate,año,mes,hour,affected,compID,serv_pais_prodID,ven_comp,ven_serv)*/
            VALUES (
                    (select ticketid from cscs where cscsid = @row)/*,DAYOFWEEK(@inicio),@inicio,year(@inicio),month(@inicio),@hourini,1,@compID,(select serv_pais_prodID from cscs where cscsID = @row),(select CASE
                        WHEN @vencomp = 1 THEN  (select venx  from  ven1  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 2 THEN  (select venx  from  ven2  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 3 THEN  (select venx  from  ven3  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 4 THEN  (select venx  from  ven4  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 5 THEN  (select venx  from  ven5  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 6 THEN  (select venx  from  ven6  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 7 THEN  (select venx  from  ven7  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 8 THEN  (select venx  from  ven8  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 9 THEN  (select venx  from  ven9  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 10 THEN  (select venx  from  ven10  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 11 THEN  (select venx  from  ven11  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 12 THEN  (select venx  from  ven12  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @vencomp = 13 THEN  (select venx  from  ven13  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        ELSE 0
                    END),(select CASE
                        WHEN @venserv = 1 THEN  (select venx  from  ven1  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 2 THEN  (select venx  from  ven2  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 3 THEN  (select venx  from  ven3  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 4 THEN  (select venx  from  ven4  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 5 THEN  (select venx  from  ven5  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 6 THEN  (select venx  from  ven6  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 7 THEN  (select venx  from  ven7  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 8 THEN  (select venx  from  ven8  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 9 THEN  (select venx  from  ven9  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 10 THEN  (select venx  from  ven10  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 11 THEN  (select venx  from  ven11  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 12 THEN  (select venx  from  ven12  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        WHEN @venserv = 13 THEN  (select venx  from  ven13  WHERE hour = DATE_FORMAT(@inicio,'%H:%i:%s') and diasem = DAYOFWEEK(@inicio))
                        ELSE 0
                    END)  */               
                    );
    
                    
            SET @inicio =  @inicio + INTERVAL 1 MINUTE;
        END WHILE;
        
        SET @row = @row +1;
    END WHILE;
    UPDATE indisp
    SET ven_serv = 0
    WHERE ven_serv IS NULL;
   
END

解决方法

为自己建立一个日期表。然后LEFT JOIN将该表添加到您的其他数据。

一次性设置日期表会涉及一个循环（或交叉连接或整数表或MariaDB seq表）。

然后JOIN将非常有效；可能比您在MSSql中更有效。没有循环，只有JOIN。如果您甚至需要在假期等期间创建行，则可能是LEFT JOIN。

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