|Date: ||Thu, 27 Sep 2001 15:12:27 +0100|
|Reply-To: ||Stephen Dunn <stephen.dunn@HIGHWAY-INSURANCE.CO.UK>|
|Sender: ||"SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>|
|From: ||Stephen Dunn <stephen.dunn@HIGHWAY-INSURANCE.CO.UK>|
|Subject: ||Performance problems in V8.2|
|Content-Type: ||text/plain; charset="iso-8859-1"|
We have a number of SQL delete steps in our data warehouse update process
- running on a Windows NT 4 server. They delete observations based on the
correlated subquery below. The table in the subquery (obs=42) has a
composite index (claimno,yoa) and the master file (obs=680000) has no
indexes. In version 8.1 this step took 30 secs but in version 8.2 it takes
over 6 minutes. Other deletes are also showing order-of-magnitude
1227 from dsetout.clmtran as p
1228 where exists (select *
1229 from clmtran as c
1230 where p.yoa=c.yoa and p.claimno=c.claimno
NOTE: 42 rows were deleted from DSETOUT.CLMTRAN.
Have other people had similar experiences?
Any suggestion for a workaround?
You'd think SAS would test this kind of thing wouldn't you?
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