Article ID: 841627
Article Last Modified on 11/2/2007
APPLIES TO
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Standard Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Personal Edition
- Microsoft SQL Server 2000 Enterprise Edition
- Microsoft SQL Server 2000 Workgroup Edition
- Microsoft SQL Server 2000 Desktop Engine (Windows)
- Microsoft SQL Server 2000 Developer Edition
- Microsoft SQL Server 2000 Enterprise Edition 64-bit
Bug #: 471399 (SQL Server 8.0)
Microsoft SQL Server 2000 fixes are distributed as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2000 fix release.
SYMPTOMS
When you run a Transact-SQL query, Microsoft SQL Server 2000 may underestimate the cardinality of the query expression. Therefore, the SQL Server query optimizer may not be able to generate an optimal query execution plan, and the query performance may be slow and inconsistent. This problem occurs when both of the following conditions are true:
- The max degree of parallelism configuration option for your instance of SQL Server is set to 0 or to a number that is greater than 1.
- The query is based on a view.
RESOLUTION
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
290211 How to obtain the latest SQL Server 2000 service pack
Hotfix information
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name ------------------------------------------------------------------------------- 27-Apr-2004 05:33 2000.80.936.0 664,128 Autoplt.dll 27-Apr-2004 05:33 2000.80.936.0 78,400 Console.exe 27-Apr-2004 05:33 2000.80.936.0 315,968 Custtask.dll 27-Apr-2004 05:33 2000.80.936.0 33,340 Dbmslpcn.dll 08-Apr-2004 09:12 786,432 Distmdl.ldf 08-Apr-2004 09:12 2,359,296 Distmdl.mdf 10-Oct-2003 06:18 180 Drop_repl_hotfix.sql 27-Apr-2004 05:33 2000.80.936.0 1,905,216 Dtspkg.dll 27-Apr-2004 05:33 2000.80.936.0 528,960 Dtspump.dll 27-Apr-2004 05:33 2000.80.936.0 1,557,052 Dtsui.dll 27-Apr-2004 05:33 2000.80.936.0 639,552 Dtswiz.dll 10-Oct-2003 06:18 747,927 Instdist.sql 10-Oct-2003 06:18 1,581 Inst_repl_hotfix.sql 27-Apr-2004 05:33 2000.80.936.0 82,492 Itwiz.exe 27-Apr-2004 05:33 2000.80.936.0 90,692 Msgprox.dll 27-Apr-2004 05:33 2000.80.936.0 62,024 Odsole70.dll 27-Apr-2004 05:34 2000.80.936.0 25,144 Opends60.dll 27-Apr-2004 05:33 2000.80.936.0 57,904 Osql.exe 27-Apr-2004 05:33 2000.80.936.0 279,104 Pfutil80.dll 10-Oct-2003 06:07 550,780 Procsyst.sql 08-Apr-2004 09:12 12,305 Qfe469315.sql 08-Apr-2004 09:12 19,195 Qfe469571.sql 27-Apr-2004 04:24 1,104,848 Replmerg.sql 27-Apr-2004 05:33 2000.80.936.0 221,768 Replprov.dll 27-Apr-2004 05:33 2000.80.936.0 307,784 Replrec.dll 27-Apr-2004 04:32 2000.80.936.0 159,813 Replres.rll 10-Oct-2003 06:18 1,087,150 Replsys.sql 10-Oct-2003 06:18 986,603 Repltran.sql 27-Apr-2004 05:33 2000.80.936.0 287,304 Rinitcom.dll 27-Apr-2004 05:33 2000.80.936.0 66,112 Semmap.dll 27-Apr-2004 05:33 2000.80.936.0 57,916 Semnt.dll 27-Apr-2004 05:33 2000.80.936.0 492,096 Semobj.dll 27-Apr-2004 05:00 2000.80.936.0 172,032 Semobj.rll 27-Apr-2004 05:33 2000.80.936.0 53,832 Snapshot.exe 11-Mar-2004 14:40 117,834 Sp3_serv_uni.sql 27-Apr-2004 05:32 2000.80.936.0 28,672 Sqlagent.dll 27-Apr-2004 05:33 2000.80.936.0 311,872 Sqlagent.exe 27-Apr-2004 05:32 2000.80.936.0 168,001 Sqlakw32.dll 27-Apr-2004 05:33 2000.80.936.0 33,344 Sqlctr80.dll 27-Apr-2004 05:33 2000.80.936.0 4,215,360 Sqldmo.dll 27-Apr-2004 05:33 25,172 Sqldumper.exe 27-Apr-2004 04:22 2000.80.936.0 28,672 Sqlevn70.rll 27-Apr-2004 05:33 2000.80.936.0 180,792 Sqlmap70.dll 27-Apr-2004 05:33 2000.80.936.0 188,992 Sqlmmc.dll 27-Apr-2004 05:01 2000.80.936.0 479,232 Sqlmmc.rll 27-Apr-2004 05:33 2000.80.936.0 401,984 Sqlqry.dll 27-Apr-2004 05:33 2000.80.936.0 57,920 Sqlrepss.dll 27-Apr-2004 05:34 2000.80.936.0 7,581,777 Sqlservr.exe 27-Apr-2004 05:33 2000.80.936.0 590,396 Sqlsort.dll 27-Apr-2004 05:33 2000.80.936.0 45,644 Sqlvdi.dll 27-Apr-2004 05:33 2000.80.936.0 106,588 Sqsrvres.dll 27-Apr-2004 05:33 2000.80.936.0 33,340 Ssmslpcn.dll 27-Apr-2004 05:33 2000.80.936.0 82,492 Ssnetlib.dll 27-Apr-2004 05:33 2000.80.936.0 25,148 Ssnmpn70.dll 27-Apr-2004 05:33 2000.80.936.0 123,456 Stardds.dll 27-Apr-2004 05:33 2000.80.936.0 158,240 Svrnetcn.dll 27-Apr-2004 05:33 2000.80.936.0 76,416 Svrnetcn.exe 27-Apr-2004 05:34 2000.80.936.0 49,228 Ums.dll 27-Apr-2004 05:34 2000.80.936.0 98,872 Xpweb70.dll
Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.
WORKAROUND
To work around this problem, you must rewrite the query so that the query is based directly on the tables, instead of on the view. You can also rewrite the query to include the OPTION (MAXDOP =1) query hint to override the max degree of parallelism configuration option.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.
REFERENCES
For additional information about general troubleshooting steps to perform when query performance is slow, click the following article number to view the article in the Microsoft Knowledge Base:
243589 How to troubleshoot slow-running queries on SQL Server 7.0 or later
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
831302 FIX: SQL Server underestimates the cardinality of a query expression and query performance may be slow
824684 FIX: SQL Server underestimates the cardinality of a query expression and query performance may be slow
Keywords: kbbug kbfix kbperformance kbtsql kbqfe kbsqlserv2000presp4fix kbquery kbhotfixserver KB841627