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
4244
November 16, 2013 02:42PM
1486
November 17, 2013 07:42PM
1499
November 17, 2013 08:01PM
1508
November 18, 2013 04:33PM
2034
November 18, 2013 07:54PM
1719
November 19, 2013 04:10PM
1614
November 19, 2013 08:36PM
1671
November 21, 2013 02:55PM
1878
December 05, 2013 03:46PM
1516
December 07, 2013 02:10PM
1487
December 09, 2013 06:08PM
Re: Subquery with range uses filesort
1575
December 14, 2013 09:51PM
1453
December 14, 2013 10:17PM
1523
December 15, 2013 11:29PM
1607
December 17, 2013 06:58PM
1529
December 18, 2013 05:49PM
1568
December 18, 2013 08:28PM
1602
December 19, 2013 10:13PM
1566
December 19, 2013 10:28PM
1422
December 20, 2013 07:06PM
1510
December 21, 2013 07:36AM
1551
December 22, 2013 10:01AM
1616
December 22, 2013 10:45AM
1516
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.