Microsoft KB Archive/830298

= FIX: SQL Server 2000 SP3 may generate slower query plans and bad cardinality estimates =

Article ID: 830298

Article Last Modified on 11/2/2007

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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

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SYMPTOMS
Microsoft SQL Server 2000 may start generating slower query plans in SQL Server 2000 Service Pack 3 (SP3) if the following conditions are true:
 * The query contains an OUTER JOIN operator, and a view is used as the inner table of the outer join. (The view is the right table of a left join or the left table of a right join.)
 * The view specifies an expression in its SELECT list, such as an arithmetic operation, a CONVERT operator, or another function.
 * The view does not use DISTINCT, TOP, or GROUP BY operators or any aggregate operators, such as COUNT(*).

This problem is a regression from a SQL Server 2000 SP3 fix that is described in the following article in the Microsoft Knowledge Base:

321541 FIX: SQL Server might return incorrect results when you use an outer join and a view

The fix changes the tree structure that the SQL Server query optimizer receives when the parser operates on a query that contains a view that meets the previously described conditions. Because of this change, the SQL Server query optimizer cannot use the available statistics from the base table that is specified in the view. As a result, the cardinality estimates are different, and this difference may affect the execution plan that you choose.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For additional 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 31-May-2003 16:45  2000.80.818.0      78,400  Console.exe 24-Jun-2003 23:01  2000.80.818.0      33,340  Dbmslpcn.dll 25-Apr-2003 00:12                    786,432  Distmdl.ldf 25-Apr-2003 00:12                  2,359,296  Distmdl.mdf 29-Jan-2003 23:55                        180  Drop_repl_hotfix.sql 12-Sep-2003 01:26  2000.80.859.0   1,905,216  Dtspkg.dll 26-Aug-2003 18:16  2000.80.854.0     528,960  Dtspump.dll 23-Jun-2003 20:40  2000.80.837.0   1,557,052  Dtsui.dll 23-Jun-2003 20:40  2000.80.837.0     639,552  Dtswiz.dll 24-Apr-2003 00:51                    747,927  Instdist.sql 02-May-2003 23:56                      1,581  Inst_repl_hotfix.sql 08-Feb-2003 04:40  2000.80.765.0      90,692  Msgprox.dll 01-Apr-2003 00:07                      1,873  Odsole.sql 04-Apr-2003 23:46  2000.80.800.0      62,024  Odsole70.dll 07-May-2003 18:41  2000.80.819.0      25,144  Opends60.dll 02-Apr-2003 19:48  2000.80.796.0      57,904  Osql.exe 02-Apr-2003 21:15  2000.80.797.0     279,104  Pfutil80.dll 04-Aug-2003 16:17                    550,780  Procsyst.sql 11-Sep-2003 22:37                     12,305  Qfe469315.sql 22-May-2003 20:57                     19,195  Qfe469571.sql 05-Sep-2003 23:36                  1,090,932  Replmerg.sql 06-Sep-2003 05:18  2000.80.858.0     221,768  Replprov.dll 06-Sep-2003 05:18  2000.80.858.0     307,784  Replrec.dll 05-Sep-2003 22:00                  1,087,150  Replsys.sql 13-Aug-2003 14:28                    986,603  Repltran.sql 29-Jul-2003 18:13  2000.80.819.0     492,096  Semobj.dll 31-May-2003 16:27  2000.80.818.0     172,032  Semobj.rll 05-Aug-2003 19:06                    127,884  Sp3_serv_uni.sql 31-May-2003 23:01  2000.80.818.0   4,215,360  Sqldmo.dll 07-Apr-2003 15:44                     25,172  Sqldumper.exe 19-Mar-2003 16:20  2000.80.789.0      28,672  Sqlevn70.rll 27-Sep-2003 02:42  2000.80.865.0     180,792  Sqlmap70.dll 03-Sep-2003 00:56  2000.80.857.0     188,992  Sqlmmc.dll 02-Sep-2003 21:03  2000.80.857.0     479,232  Sqlmmc.rll 08-Feb-2003 04:40  2000.80.765.0      57,920  Sqlrepss.dll 27-Sep-2003 02:42  2000.80.865.0   7,606,353  Sqlservr.exe 25-Jul-2003 19:44  2000.80.845.0     590,396  Sqlsort.dll 08-Feb-2003 04:40  2000.80.765.0      45,644  Sqlvdi.dll 24-Jun-2003 23:01  2000.80.818.0      33,340  Ssmslpcn.dll 31-May-2003 23:01  2000.80.818.0      82,492  Ssnetlib.dll 31-May-2003 23:01  2000.80.818.0      25,148  Ssnmpn70.dll 31-May-2003 23:01  2000.80.818.0     158,240  Svrnetcn.dll 31-May-2003 16:59  2000.80.818.0      76,416  Svrnetcn.exe 30-Apr-2003 21:52  2000.80.816.0      45,132  Ums.dll 01-Jul-2003 22:19  2000.80.834.0      98,816  Xpweb70.dll

Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.

Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB830298

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