Microsoft KB Archive/884850

= FIX: When you run ad-hoc queries in Microsoft SQL Server 2000, ad-hoc query processing performance degradation may occur =

Article ID: 884850

Article Last Modified on 6/1/2006

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APPLIES TO


 * Microsoft SQL Server 2000 Standard Edition
 * Microsoft SQL Server 2000 64-bit Edition

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Bug #: 472458 (SQL Server 8.0)



Article contents

 * Summary
 * Introduction
 * Issues that are fixed by this hotfix package
 * Cause
 * Resolution
 * Hotfix information
 * Prerequisites
 * Restart information
 * Registry information
 * Hotfix file information
 * Status
 * More information



SUMMARY
This article describes the following about this hotfix release:
 * The issues that are fixed by this hotfix package.
 * The prerequisites for installing the hotfix package.
 * Whether you must restart your computer after you install the hotfix package.
 * Whether the hotfix package is replaced by any other hotfix package.
 * Whether you must make any registry changes.
 * The files that are contained in the hotfix package.

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Issues that are fixed by this hotfix package
The following issue is fixed in this Microsoft SQL Server 2000 hotfix package:
 * When you run ad-hoc queries in Microsoft SQL Server 2000, ad-hoc query processing performance degradation occurs. When the performance degradation occurs, you may see that there are many system process IDs (SPID) in the sysprocesses table. Additionally, the lastwaittype column in the sysprocesses table has a CMEMTHREAD value.

Note This problem is more prevalent on computers that are running Microsoft SQL Server 2000 64-bit than on computers that are running Microsoft SQL Server 2000 32-bit. The problem occurs because of the larger buffer pool sizes available to the 64-bit architecture. To date, this problem has occurred on computers that have a procedure cache that is larger than 16 GB.

For a list of previous hotfixes, see the &quot;Microsoft SQL Server 2000 Post-Service Pack 3 or Microsoft SQL Server 2000 Post-Service Pack 3a hotfixes&quot; section in the following Microsoft Knowledge Base article:

290211 How to obtain the latest SQL Server 2000 service pack

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CAUSE
This problem occurs when one of the following conditions is true:


 * A large percentage of the workload is submitted without using defined parameters from a front end application.
 * The procedure cache has grown very large. When the procedure cache grows very large, the memory allocation for new queries may become inefficient.

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Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft SQL Server 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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Prerequisites

 * Microsoft SQL Server 2000 Service Pack 3 (SP3) or Microsoft SQL Server 2000 Service Pack 3a (SP3a)

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

For additional information about the SQL Server 2000 hotfix installers, click one of the following article numbers 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

872912 Description of the 64-bit SQL Server 2000 hotfix installer

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Restart information
You must restart your instance of SQL Server 2000 after you apply this hotfix.

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Registry information
You do not have to make changes to the registry.

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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 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) 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 -- 15-Sep-2004 02:40  2000.80.977.0     664,128  Autoplt.dll 15-Sep-2004 02:40  2000.80.977.0      78,400  Console.exe 15-Sep-2004 02:40  2000.80.977.0     332,352  Ctasksui.dll 15-Sep-2004 02:40  2000.80.977.0     315,968  Custtask.dll 15-Sep-2004 02:40  2000.80.977.0      33,340  Dbmslpcn.dll 08-Apr-2004 21:42                    786,432  Distmdl.ldf 08-Apr-2004 21:42                  2,359,296  Distmdl.mdf 30-Sep-2003 22:55                        180  Drop_repl_hotfix.sql 15-Sep-2004 02:40  2000.80.977.0   1,905,216  Dtspkg.dll 15-Sep-2004 02:40  2000.80.977.0     528,960  Dtspump.dll 15-Sep-2004 02:40  2000.80.977.0   1,557,052  Dtsui.dll 15-Sep-2004 02:40  2000.80.977.0     639,552  Dtswiz.dll 30-Sep-2003 22:55                    747,927  Instdist.sql 30-Sep-2003 22:55                      1,581  Inst_repl_hotfix.sql 15-Sep-2004 02:40  2000.80.977.0     352,828  Isqlw.exe 15-Sep-2004 02:40  2000.80.977.0      82,492  Itwiz.exe 15-Sep-2004 02:40  2000.80.977.0      90,692  Msgprox.dll 19-May-2004 23:43  8.11.40209.0      209,408  Mssdi98.dll 15-Sep-2004 02:40  2000.80.977.0      62,024  Odsole70.dll 15-Sep-2004 02:41  2000.80.977.0      25,144  Opends60.dll 15-Sep-2004 02:40  2000.80.977.0      57,904  Osql.exe 15-Sep-2004 02:40  2000.80.977.0     279,104  Pfutil80.dll 30-Sep-2003 22:48                    550,780  Procsyst.sql 08-Apr-2004 21:42                     12,305  Qfe469315.sql 08-Apr-2004 21:42                     19,195  Qfe469571.sql 27-Aug-2004 00:13                      5,157  Qfe472197.sql 15-Sep-2004 02:40  2000.80.977.0     143,940  Qrdrsvc.exe 13-Sep-2004 22:09                  1,105,167  Replmerg.sql 15-Sep-2004 02:40  2000.80.977.0     221,768  Replprov.dll 15-Sep-2004 02:40  2000.80.977.0     307,784  Replrec.dll 13-Sep-2004 18:16  2000.80.977.0     159,813  Replres.rll 27-Aug-2004 00:13                  1,086,925  Replsys.sql 30-Sep-2003 22:55                    986,603  Repltran.sql 15-Sep-2004 02:40  2000.80.977.0     287,304  Rinitcom.dll 15-Sep-2004 02:40  2000.80.977.0      78,416  Sdiclnt.dll 15-Sep-2004 02:41  2000.80.977.0      66,112  Semmap.dll 15-Sep-2004 02:41  2000.80.977.0      57,916  Semnt.dll 15-Sep-2004 02:41  2000.80.977.0     492,096  Semobj.dll 13-Sep-2004 18:47  2000.80.977.0     172,032  Semobj.rll 15-Sep-2004 02:40  2000.80.977.0      53,832  Snapshot.exe 30-Sep-2003 22:48                    117,834  Sp3_serv_uni.sql 15-Sep-2004 02:40  2000.80.977.0      28,672  Sqlagent.dll 15-Sep-2004 02:40  2000.80.977.0     311,872  Sqlagent.exe 15-Sep-2004 02:40  2000.80.977.0     168,001  Sqlakw32.dll 15-Sep-2004 02:41  2000.80.977.0      33,344  Sqlctr80.dll 15-Sep-2004 02:41  2000.80.977.0   4,215,360  Sqldmo.dll 15-Sep-2004 02:40                     25,172  Sqldumper.exe 13-Sep-2004 18:09  2000.80.977.0      28,672  Sqlevn70.rll 15-Sep-2004 02:40  2000.80.977.0     156,224  Sqlmaint.exe 15-Sep-2004 02:41  2000.80.977.0     180,792  Sqlmap70.dll 15-Sep-2004 02:41  2000.80.977.0     188,992  Sqlmmc.dll 13-Sep-2004 18:51  2000.80.977.0     479,232  Sqlmmc.rll 15-Sep-2004 02:41  2000.80.977.0     401,984  Sqlqry.dll 15-Sep-2004 02:41  2000.80.977.0      57,920  Sqlrepss.dll 15-Sep-2004 02:41  2000.80.977.0   7,708,753  Sqlservr.exe 15-Sep-2004 02:41  2000.80.977.0     590,396  Sqlsort.dll 15-Sep-2004 02:41  2000.80.977.0      45,644  Sqlvdi.dll 15-Sep-2004 02:41  2000.80.977.0     106,588  Sqsrvres.dll 15-Sep-2004 02:41  2000.80.977.0      33,340  Ssmsgnet.dll 15-Sep-2004 02:41  2000.80.977.0      33,340  Ssmslpcn.dll 15-Sep-2004 02:41  2000.80.977.0      33,340  Ssmsqlgc.dll 15-Sep-2004 02:41  2000.80.977.0      82,492  Ssnetlib.dll 15-Sep-2004 02:41  2000.80.977.0      25,148  Ssnmpn70.dll 15-Sep-2004 02:41  2000.80.977.0     123,456  Stardds.dll 15-Sep-2004 02:41  2000.80.977.0     158,240  Svrnetcn.dll 15-Sep-2004 02:40  2000.80.977.0      76,416  Svrnetcn.exe 15-Sep-2004 02:41  2000.80.977.0      49,228  Ums.dll 15-Sep-2004 02:41  2000.80.977.0      74,304  Xplog70.dll 15-Sep-2004 02:41  2000.80.977.0      98,872  Xpweb70.dll

SQL Server 2000 64-bit version
Date        Time   Version            Size    File name        Platform

16-Sep-2004 04:28  2000.80.977.0      56,832  Dbmslpcn.dll     IA-64 30-Sep-2003 22:55                        180  Drop_repl_hotfix.sql 16-Sep-2004 04:27  2000.80.977.0     528,960  Dtspump.dll      x86 30-Sep-2003 22:55                    747,927  Instdist.sql 30-Sep-2003 22:55                      1,581  Inst_repl_hotfix.sql 16-Sep-2004 04:28  2000.80.977.0     185,856  Msgprox.dll      IA-64 19-May-2004 23:43  8.11.40517.0      722,944  Mssdi98.dll      IA-64 16-Sep-2004 04:28  2000.80.977.0     151,040  Odsole70.dll     IA-64 16-Sep-2004 04:29  2000.80.977.0      27,136  Opends60.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     148,992  Osql.exe         IA-64 30-Sep-2003 22:48                    550,780  Procsyst.sql 08-Apr-2004 21:42                     12,305  Qfe469315.sql 08-Apr-2004 21:42                     19,195  Qfe469571.sql 27-Aug-2004 00:13                      5,157  Qfe472197.sql 16-Sep-2004 04:28  2000.80.977.0     353,280  Qrdrsvc.exe      IA-64 13-Sep-2004 22:09                  1,105,167  Replmerg.sql 16-Sep-2004 04:28  2000.80.977.0     534,528  Replprov.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     769,024  Replrec.dll      IA-64 13-Sep-2004 22:12  2000.80.977.0     146,432  Replres.rll 27-Aug-2004 00:13                  1,086,925  Replsys.sql 30-Sep-2003 22:55                    986,603  Repltran.sql 16-Sep-2004 04:28  2000.80.977.0     650,240  Rinitcom.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     160,768  Semmap.dll       IA-64 16-Sep-2004 04:28  2000.80.977.0     132,608  Semnt.dll        IA-64 16-Sep-2004 04:28  2000.80.977.0      88,576  Snapshot.exe     IA-64 30-Sep-2003 22:48                    117,834  Sp3_serv_uni.sql 16-Sep-2004 04:27  2000.80.977.0      10,240  Sqlagent.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0   1,055,232  Sqlagent.exe     IA-64 16-Sep-2004 04:28  2000.80.977.0      90,112  Sqlboot.dll      IA-64 16-Sep-2004 04:28  2000.80.977.0      32,256  Sqlctr80.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0  13,845,504  Sqldmo.dll       IA-64 16-Sep-2004 04:28                     39,936  Sqldumper.exe    IA-64 13-Sep-2004 21:54  2000.80.977.0      19,968  Sqlevn70.rll 16-Sep-2004 04:28  2000.80.977.0     493,568  Sqlmaint.exe     IA-64 16-Sep-2004 04:28  2000.80.977.0      23,040  Sqlmap70.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     152,064  Sqlrepss.dll     IA-64 16-Sep-2004 04:29  2000.80.977.0  25,211,904  Sqlservr.exe     IA-64 16-Sep-2004 04:28  2000.80.977.0     616,960  Sqlsort.dll      IA-64 16-Sep-2004 04:28  2000.80.977.0     120,320  Sqlvdi.dll       IA-64 16-Sep-2004 04:28  2000.80.977.0     227,328  Sqsrvres.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0      53,760  Ssmslpcn.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0      59,904  Ssmsqlgc.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     255,488  Ssnetlib.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0      20,992  Ssnmpn70.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     430,080  Svrnetcn.dll     IA-64 16-Sep-2004 04:28  2000.80.977.0     185,856  Svrnetcn.exe     IA-64 16-Sep-2004 04:28  2000.80.977.0     183,296  Xplog70.dll      IA-64 16-Sep-2004 04:28  2000.80.977.0     187,392  Xpweb70.dll      IA-64 Note Because of file dependencies, the most recent hotfix that contains these files may also contain additional files.

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

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MORE INFORMATION
The dynamic memory management architecture in SQL Server lets the data pages and the procedure cache share the same buffer pool. Typically, this design works fine because the Lazywriter process naturally ages out buffers in the buffer pool that are not being reused frequently. However, with a high rate of incoming ad-hoc queries, it is possible for the procedure cache to grow very large relative to the data cache. The large procedure cache causes the performance problems on a computer that is running Microsoft SQL Server 2000 64-bit that were mentioned earlier.

The hotfix discussed in this article improves the efficiency of SQL Server's internal memory allocation process when the procedure cache grows very large.

For additional information about the lastwaittype field in the sysprocesses table, click the following article number to view the article in the Microsoft Knowledge Base:

822101 The waittype and lastwaittype fields in the sysprocesses table

For additional information about the naming schema for Microsoft 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 correcting 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

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Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB884850

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