Question

我已经编写了以下过程来在具有70万个条目的数据库上运行。我有一个超时错误，所以我将超时延长到6000而不是600.这并没有解决它。我收到丢失的连接错误，然后我重复调用它给出了一个锁定等待超时错误。

是否有更有效的方法来执行相同的任务？

代码正在连接两个表，计算事件发生的次数，最后显示该计数大于零的百分比。

DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `EvaluateOutput4`()

BEGIN

declare v_max int default (Select  count(*) FROM tracker.results);
declare v_counter int default 0;
start transaction;

while v_counter < v_max do


 SET @v1 :=
(Select  count(*)
 FROM tracker.Meetings LEFT outer JOIN  tracker.Visits  on tracker.Meetings.visit1 =tracker.Visits.id or tracker.Meetings.visit2 =tracker.Visits.id 
where (tracker.Meetings.user1= (Select VehicleID from tracker.results where RecordID= v_counter) or tracker.Meetings.user2=(Select VehicleID from tracker.results where RecordID= v_counter) ) 
and tracker.Visits.node=(Select Node from tracker.results where RecordID= v_counter)  
and HOUR(time)>=(Select ArrivalTime from tracker.results where RecordID= v_counter) -1 
and HOUR(time)<=(Select ArrivalTime from tracker.results where RecordID= v_counter)+1) ;


Update results  set results.Count=  @v1
Where results.RecordID=v_counter;

set v_counter = v_counter + 1;

end while;

SET @v2 := (Select count(*)from results where results.Count !=0 );
Set @v4 :=(@v2*100/v_max); 
select @v4;

 commit;

END

执行大型mysql程序。错误代码2013，重复时它会给出错误代码1205

0 个答案: