Microsoft KB Archive/890942

= FIX: Some complex queries are slower after you install SQL Server 2000 Service Pack 2 or SQL Server 2000 Service Pack 3 =

Article ID: 890942

Article Last Modified on 11/2/2007

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APPLIES TO


 * Microsoft SQL Server 2000 Service Pack 2
 * Microsoft SQL Server 2000 Service Pack 2
 * Microsoft SQL Server 2000 Service Pack 2
 * Microsoft SQL Server 2000 Service Pack 2
 * Microsoft SQL Server 2000 Service Pack 2
 * Microsoft SQL Server 2000 Desktop Engine
 * Microsoft SQL Server 2000 Service Pack 3
 * Microsoft SQL Server 2000 Service Pack 3
 * Microsoft SQL Server 2000 Service Pack 3
 * Microsoft SQL Server 2000 Personal Edition Service Pack 3
 * Microsoft SQL Server 2000 Service Pack 3
 * Microsoft SQL Server 2000 Workgroup Edition
 * Microsoft SQL Server 2000 Desktop Engine
 * Microsoft SQL Server 2000 Developer Edition
 * Microsoft SQL Server 2000 Enterprise Edition 64-bit

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Bug #: 473314 (SQL Server 8.0)



SYMPTOMS
After you install Microsoft SQL Server 2000 Service Pack 2 (SP2) or SQL Server 2000 Service Pack 3 (SP3), you may notice that complex queries that contain many join clauses and sub-queries are slower than before.

For a list of all publicly released SQL Server 2000 Post-Service Pack 3a hotfixes, see the following article in the Microsoft Knowledge Base:

810185 SQL Server 2000 hotfix update for SQL Server 2000 Service Pack 3 and 3a



CAUSE
The SQL Server optimizer has built-in thresholds that determine when to stop or to continue optimizing a query after a plan has been obtained. These thresholds exist to make sure that a balance exists between compilation time and execution time.

In the original released version of SQL Server 2000, a problem with the thresholds was found that caused SQL Server to spend a long time optimizing certain queries. In SQL Server 2000 SP2, a change to the thresholds was made to fix the problem. The new thresholds work well most of the time. However, there are always queries that are right at the boundary of the thresholds that may receive a better execution plan with more optimization.



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

Prerequisites
 Microsoft SQL Server 2000 Service Pack 3 (SP3).

For additional information about how to obtain SQL Server 2000 Service Pack 3, 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

 You must also have SQL Server 2000 Hotfix build 2000.80.977 installed.

For additional information about error messages that you receive when the SQL Server 2000 Post SP3a hotfix build 200.80.977 is not installed, click the following article number to view the article in the Microsoft Knowledge Base:

888007 You receive a &quot;The product does not have a prerequisite update installed&quot; error message when you try to install a SQL Server 2000 post-Service Pack 3 hotfix

For additional information about the hotfix installer for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:

842960 Description of the 32-bit SQL Server 7.0 and SQL Server 2000 hotfix installer



Restart information
You must restart your computer after you apply this hotfix.

Hotfix file information
This hotfix contains only those files that are required to correct the issues that this article lists. This hotfix may not contain of all the files that you must have to fully update a product to the latest build.

The English version of this hotfix has the file attributes (or later file attributes) 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.

SQL Server 2000 32-bit versions
  Date         Time   Version        Size       File name --  03-Dec-2004  17:49  2000.80.994.0    664,128  Autoplt.dll 03-Dec-2004 17:49  2000.80.994.0     78,400  Console.exe 03-Dec-2004 17:49  2000.80.994.0    332,352  Ctasksui.dll 03-Dec-2004 17:49  2000.80.994.0    315,968  Custtask.dll 03-Dec-2004 17:49  2000.80.994.0     33,340  Dbmslpcn.dll 08-Apr-2004 12:42                   786,432  Distmdl.ldf 08-Apr-2004 12:42                 2,359,296  Distmdl.mdf 30-Sep-2003 13:55                       180  Drop_repl_hotfix.sql 03-Dec-2004 17:49  2000.80.994.0  1,905,216  Dtspkg.dll 03-Dec-2004 17:49  2000.80.994.0    528,960  Dtspump.dll 03-Dec-2004 17:49  2000.80.994.0  1,557,052  Dtsui.dll 03-Dec-2004 17:49  2000.80.994.0    639,552  Dtswiz.dll 30-Sep-2003 13:55                   747,927  Instdist.sql 30-Sep-2003 13:55                     1,581  Inst_repl_hotfix.sql 03-Dec-2004 17:49  2000.80.994.0    352,828  Isqlw.exe 03-Dec-2004 17:49  2000.80.994.0     82,492  Itwiz.exe 03-Dec-2004 17:49  2000.80.994.0     90,692  Msgprox.dll 28-Oct-2004 23:16  8.11.41022.0     226,304  Mssdi98.dll 03-Dec-2004 17:49  2000.80.994.0     62,024  Odsole70.dll 03-Dec-2004 17:50  2000.80.994.0     25,144  Opends60.dll 03-Dec-2004 17:49  2000.80.994.0     57,904  Osql.exe 03-Dec-2004 17:49  2000.80.994.0    279,104  Pfutil80.dll 30-Sep-2003 13:48                   550,780  Procsyst.sql 08-Apr-2004 12:42                    12,305  Qfe469315.sql 08-Apr-2004 12:42                    19,195  Qfe469571.sql 26-Aug-2004 15:14                     5,157  Qfe472197.sql 03-Dec-2004 17:49  2000.80.994.0    143,940  Qrdrsvc.exe 03-Dec-2004 11:25                 1,136,072  Replmerg.sql 03-Dec-2004 17:49  2000.80.994.0    221,768  Replprov.dll 03-Dec-2004 17:49  2000.80.994.0    307,784  Replrec.dll 03-Dec-2004 11:38  2000.80.994.0    159,813  Replres.rll 02-Dec-2004 17:53                 1,088,240  Replsys.sql 30-Sep-2003 13:55                   986,603  Repltran.sql 24-Nov-2004 15:04                        55  Repl_uninstall.sql 03-Dec-2004 17:49  2000.80.994.0    287,304  Rinitcom.dll 03-Dec-2004 17:49  2000.80.994.0     78,416  Sdiclnt.dll 03-Dec-2004 17:49  2000.80.994.0     66,112  Semmap.dll 03-Dec-2004 17:49  2000.80.994.0     57,916  Semnt.dll 03-Dec-2004 17:49  2000.80.994.0    492,096  Semobj.dll 03-Dec-2004 12:08  2000.80.994.0    172,032  Semobj.rll 03-Dec-2004 17:49  2000.80.994.0     53,832  Snapshot.exe 30-Sep-2003 13:48                   117,834  Sp3_serv_uni.sql 03-Dec-2004 17:48  2000.80.994.0     28,672  Sqlagent.dll 03-Dec-2004 17:49  2000.80.994.0    311,872  Sqlagent.exe 03-Dec-2004 17:48  2000.80.994.0    168,001  Sqlakw32.dll 03-Dec-2004 17:49  2000.80.994.0     33,344  Sqlctr80.dll 03-Dec-2004 17:49  2000.80.994.0  4,215,360  Sqldmo.dll 03-Dec-2004 17:49                    25,172  Sqldumper.exe 03-Dec-2004 11:23  2000.80.994.0     28,672  Sqlevn70.rll 03-Dec-2004 17:49  2000.80.994.0    156,224  Sqlmaint.exe 03-Dec-2004 17:49  2000.80.994.0    180,792  Sqlmap70.dll 03-Dec-2004 17:49  2000.80.994.0    188,992  Sqlmmc.dll 03-Dec-2004 12:16  2000.80.994.0    479,232  Sqlmmc.rll 03-Dec-2004 17:49  2000.80.994.0    401,984  Sqlqry.dll 03-Dec-2004 17:49  2000.80.994.0     57,920  Sqlrepss.dll 03-Dec-2004 17:49  2000.80.994.0  7,716,945  Sqlservr.exe 03-Dec-2004 17:49  2000.80.994.0    590,396  Sqlsort.dll 03-Dec-2004 17:49  2000.80.994.0     45,644  Sqlvdi.dll 03-Dec-2004 17:49  2000.80.994.0    106,588  Sqsrvres.dll 03-Dec-2004 17:49  2000.80.994.0     33,340  Ssmsgnet.dll 03-Dec-2004 17:49  2000.80.994.0     33,340  Ssmslpcn.dll 03-Dec-2004 17:49  2000.80.994.0     33,340  Ssmsqlgc.dll 03-Dec-2004 17:49  2000.80.994.0     82,492  Ssnetlib.dll 03-Dec-2004 17:49  2000.80.994.0     25,148  Ssnmpn70.dll 03-Dec-2004 17:49  2000.80.994.0    123,456  Stardds.dll 03-Dec-2004 17:49  2000.80.994.0    158,240  Svrnetcn.dll 03-Dec-2004 17:49  2000.80.994.0     76,416  Svrnetcn.exe 03-Dec-2004 17:49  2000.80.994.0     49,228  Ums.dll 03-Dec-2004 17:49  2000.80.994.0     74,304  Xplog70.dll 03-Dec-2004 17:49  2000.80.994.0     98,872  Xpweb70.dll



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.



MORE INFORMATION
To enable this hotfix, trace flag 9062 must be activated. This is a dynamic trace flag that you can activate by using one of the following methods:

Activate flag 9062 by using SQL Query Analyzer
 Open SQL Query Analyzer. Connect to the related SQL Server-based computer.</li>  Copy the following code to the Query window: DBCC TRACEON(9062, -1) </li> Click Execute.</li> Quit SQL Query Analyzer.</li></ol>

Add -T9062 to the SQL Server startup parameters

 * 1) Open SQL Enterprise Manager.
 * 2) Expand Microsoft SQL Servers, expand SQL Server Group, right-click the related SQL Server, and then click Properties.
 * 3) On the General tab, click Startup Parameters.
 * 4) In the Parameter box, type -T9062, and then click Add.
 * 5) Click OK two times, and then quit SQL Enterprise Manager.
 * 6) Restart the related SQL Server.

For additional information about the naming schema for SQL Server updates, click the following article number to view the article in the Microsoft Knowledge Base:

822499 New naming schema for Microsoft SQL Server software update packages

For additional information about the terminology that Microsoft uses when it corrects software after it is released, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: selection

Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB890942

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