SQLAnywhere INNER JOINS Differ from 5.0.03 to 5.5.04?????
I have the following query in SqlAnywhere:
SELECT
( IF sn.IsMainName = '1' THEN
sn.ShFullName
ELSE
left( String( sn.ShFullName, ' (', sh.ShFullName, ')'), 40)
ENDIF )
AS ShFullName,
c.ClntChrtID,
c.ClntActvtyStatus AS _,
Sh.PrsnDob, Sh.PrsnSex, Sh.ShId, Sh.Status, a.shPhone1,
a.shAddrss1, a.shAddrss2, a.shCity
FROM ShName sn
JOIN Sh ON sn.ShId = sh.ShId
JOIN Clnt c on c.ClntShId = sh.ShId
LEFT OUTER JOIN ShAddrss a ON c.ClntShId = a.ShId AND a.OwnrHwSiteId =
c.OwnrHwSiteId
WHERE Sh.Status = 'A'
AND sn.Status = 'A'
AND sn.ShFullName like 'SomeNameISubInHere%'
AND c.OwnrHwSiteId = GetThisSite(*)
ORDER BY sn.ShFullName
This query runs in well under a second in SQLA 5.0.03. However, its taking
8-10 mins in SQLA 5.5.04. Some things to note:
1) Clnt has 0 records
2) ShName, and Sh have about 70 000 records each
3) ShAddrss has about 1000 records.
In both versions, the query plan shows that the proper primary keys and
indexes are being used. None of the tables are accessed seqentially.
Because of the data in this case, the query should return nothing. In both
cases it returns nothing, but 5.5.04 takes way to long. (Its like its doing
all outer joins and then getting rid of stuff after the fact).
I'd appreciate any help,
Thanks,
Chris Pettingill
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Chris
5/2/1998 12:39:01 AM
sybase.sqlanywhere.general
32637 articles. 
22 followers.
5 Replies
677 Views
Try: WHERE Sh.Status = 'A' Or try: WHERE sn.Status = 'A' Just not both at the same time. You are already joining on those two columns anyhow so you might try specifying at one end or the other. I don't know your data so this may be a wild good chase but I had some luck with a similar method a couple years ago. -- Jim Egan [TeamPS] Dealer Solutions, LLC Houston, TX
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Jim
5/2/1998 12:39:08 AM
Sorry, that would be "wild goose chase" not "a wild good chase". Don't know where my mind was.... -- Jim Egan [TeamPS] Dealer Solutions, LLC Houston, TX
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Jim
5/4/1998 11:49:19 AM
Unfortunately, I need to check both sh.Status and Sn.Status. (Its actually sh.Shid and sn.Shid that I'm joining on). I tried fooling with this a bit, but it didn't work. I realized however, something that I missed before. In 5.0.03 the optimizer seqentially searches through the Clnt table first, which in this case is good because there are very few records in Clnt 0 - 1400 compared to about 70 000 in ShName and Sh. In 5.5.04, It uses the primary keys/indecies of all of the tables involved, and Clnt, is the third one joined in so I go through joining 70 000 records in the other 2 tables first. The optimizer does not seem to be working as smart in this case. I don't want to force the optimizer to always search on Clnt first however, because most sites have roughly the same number of records in Clnt, Sh, and ShName. Its a special case at a few sites where Clnt has such few records compared to the number in Sh and ShName. One interesting thing I did notice. In 5.5.04, when I 'Order By ShFullName' (the first column), I get the poor optimization and performance. But, if I 'Order By 1', I get the sort of results I'd expect. Unfortunately, this query is actually part of a bigger query, and the Order By clause gets changed dynamically at run time to possibly include any of the return columns in several different orders. I'd rather find another solution than using column numbers rather than names if I could. One other strange thing, I tried giving the optimizer very dramatic 'hints' (to force it to search on Clnt first), but it seemed to ignore them. Any ideas? Thanks
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Chris
5/5/1998 3:27:57 PM
No good ideas, but I have seen something very similar. I have a script that joins to a table with 0 or just a handful of rows, using a foreign key, and results in an ISQL estimate of 2 billion rows. The only reason it comes back quickly is because my name and address tables are pretty small (< 5000 rows). If the name table had 70,000 rows, like yours, I suspect this would take many minutes to find no rows. I know that dropping the optimizer statistics "fixes" this anomaly. In my case it is harmless, I believe, because the database is almost brand new. I don't know if there is some magical number of rows that you need to have in your 0 row table that might cause better behavior. I also can confirm seeing lots of optimizer changes, or rather, lots of negative side effects as the result of some optimizer changes, somewhere around 5.5.01 I have alot of ugly selects that used to work fine in 4.0d, and 5.0something, that went off the charts in a bad way all of a sudden. Many of them involve views, which your script doesn't. In many cases I am also unable to force a good plan using estimates. I'm working with technical support on one of these right now. If I learn anything that might apply to your case I'll let you know. Chris Pettingill <ChrisPettingill@compuserve.com> wrote in article <XcG3rkCe9GA.166@forums.powersoft.com>... > Unfortunately, I need to check both sh.Status and Sn.Status. (Its actually > sh.Shid and sn.Shid that I'm joining on). I tried fooling with this a bit, > but it didn't work. I realized however, something that I missed before. In > 5.0.03 the optimizer seqentially searches through the Clnt table first, > which in this case is good because there are very few records in Clnt 0 - > 1400 compared to about 70 000 in ShName and Sh. In 5.5.04, It uses the > primary keys/indecies of all of the tables involved, and Clnt, is the third > one joined in so I go through joining 70 000 records in the other 2 tables > first. The optimizer does not seem to be working as smart in this case. I > don't want to force the optimizer to always search on Clnt first however, > because most sites have roughly the same number of records in Clnt, Sh, and > ShName. Its a special case at a few sites where Clnt has such few records > compared to the number in Sh and ShName. One interesting thing I did > notice. In 5.5.04, when I 'Order By ShFullName' (the first column), I get > the poor optimization and performance. But, if I 'Order By 1', I get the > sort of results I'd expect. Unfortunately, this query is actually part of a > bigger query, and the Order By clause gets changed dynamically at run time > to possibly include any of the return columns in several different orders. > I'd rather find another solution than using column numbers rather than names > if I could. One other strange thing, I tried giving the optimizer very > dramatic 'hints' (to force it to search on Clnt first), but it seemed to > ignore them. > > Any ideas? > > Thanks > > >
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Rick
5/5/1998 6:48:18 PM
Those are very interesting results. I'm sure that the Sybase tech support people would like to hear this. They are usually very interested in strange optimizer results. Can you call this in? Leo Tohill - Team Powersoft -- Please post in newsgroup, not via email <
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leotohill
5/6/1998 3:24:13 AM
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