MySQL Forums
Forum List  »  Optimizer & Parser

Re: Subquery with range uses filesort
Posted by: David Marcus
Date: December 14, 2013 09:51PM

I created InnoDB versions of the tables on my development computer.

select
PlayerID, PlayerName, PlayerPrimaryClub, PlayerCountry,
HistoryEvent, HistoryDate, HistoryFinalMean, HistoryFinalStDev
from Player
join History on
HistoryPlayer = PlayerID
and HistoryEvent =
( select HistoryEvent
from History
where HistoryPlayer = PlayerID and HistoryDate <= '2012-06-30'
order by HistoryDate desc, HistoryDirector desc limit 0,1 )
where PlayerID in (...)

InnoDB
id,select_type,table,type,possible_keys,key,key_len,ref,rows,filtered,Extra
1,PRIMARY,Player,ALL,PRIMARY,NULL,NULL,NULL,51938,19.99,"Using where"
1,PRIMARY,History,eq_ref,"PRIMARY,EventReportID,PlayerDateDirector,EventInitialMean,EventFinalMean",PRIMARY,8,"func,rc_innodb.Player.PlayerID",1,100.00,"Using where"
2,"DEPENDENT SUBQUERY",History,ref,PlayerDateDirector,PlayerDateDirector,4,rc_innodb.Player.PlayerID,3,100.00,"Using where; Using index; Using filesort"

InnoDB
Development
Duration / Fetch
17.160 sec / 15.584 sec

Seems rather slow.

Options: ReplyQuote


Subject
Views
Written By
Posted
4313
November 16, 2013 02:42PM
1512
November 17, 2013 07:42PM
1518
November 17, 2013 08:01PM
1531
November 18, 2013 04:33PM
2062
November 18, 2013 07:54PM
1740
November 19, 2013 04:10PM
1636
November 19, 2013 08:36PM
1697
November 21, 2013 02:55PM
1902
December 05, 2013 03:46PM
1537
December 07, 2013 02:10PM
1510
December 09, 2013 06:08PM
Re: Subquery with range uses filesort
1601
December 14, 2013 09:51PM
1473
December 14, 2013 10:17PM
1553
December 15, 2013 11:29PM
1630
December 17, 2013 06:58PM
1552
December 18, 2013 05:49PM
1593
December 18, 2013 08:28PM
1622
December 19, 2013 10:13PM
1589
December 19, 2013 10:28PM
1444
December 20, 2013 07:06PM
1530
December 21, 2013 07:36AM
1577
December 22, 2013 10:01AM
1637
December 22, 2013 10:45AM
1540
December 25, 2013 09:30PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.