FIX: A decrease in ad-hoc query processing may occur when you submit many ad-hoc queries without using defined parameters in SQL Server 2000

This article has been archived. It is offered "as is" and will no longer be updated.
Bug #: 472854 (SQL Server 8.0)
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
back to the top
SYMPTOMS
When you submit many ad-hoc queries from a front-end application without using defined parameters in Microsoft SQL Server 2000, a decrease in ad-hoc query processing performance may occur. In some cases, you may also see an example of the following error message in the error log:
WARNING: Failed to commit contiguous memory of Size 65536.
Note This problem occurs more frequently on computers that are running Microsoft SQL Server 2000 64-bit than on computers that are running Microsoft SQL Server 2000 32-bit. This is true because a larger buffer pool size is available in the 64-bit architecture.

For a list of previous hotfixes, see the "Microsoft SQL Server 2000 post-Service Pack 3 or Microsoft SQL Server 2000 post-Service Pack 3a hotfixes" section of the following Microsoft Knowledge Base article:
290211 How to obtain the latest SQL Server 2000 service pack
CAUSE
This problem may occur because most of the memory in the SQL Server buffer pool is being used by the procedure cache. This behavior leaves almost no memory for caching data pages. Therefore, a decrease in performance occurs because queries must wait to obtain memory for newly compiled plans. Additionally, the queries must wait for I/O to read and write results from memory to the hard disk. In some cases, if the procedure cache requests are large and have been made outside the buffer pool, the Lazywriter may run even less frequently. When the Lazywriter runs less frequently, it causes greater consumption of buffer pool memory and non-buffer pool memory by procedure plans.

back to the top
RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for 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

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

back to the top

Prerequisites

You must install SQL Server 2000 Service Pack 3 (SP3) or SQL Server 2000 SP3a. For more 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
Additionally, this hotfix requires that you also have SQL Server 2000 hotfix build 2000.80.977 installed. For more information about SQL Server 2000 post-Service Pack 3a hotfix build 2000.80.977, click the following article number to view the article in the Microsoft Knowledge Base:
888007 You receive a "The product does not have a prerequisite update installed" error message when you try to install a SQL Server 2000 post-Service Pack 3 hotfix
For more information about the SQL Server 2000 hotfix installers, click the following article numbers to view the articles 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
back to the top

Restart information

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

back to the top

Hotfix file information

This hotfix contains only those files that are required to correct the problem that is described in this article. 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 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   -----------------------------------------------------------   14-Jan-2005  19:47  2000.80.1001.0    664,128  Autoplt.dll   14-Jan-2005  19:47  2000.80.1001.0     78,400  Console.exe   14-Jan-2005  19:47  2000.80.1001.0    332,352  Ctasksui.dll        14-Jan-2005  19:47  2000.80.1001.0    315,968  Custtask.dll   14-Jan-2005  19:47  2000.80.1001.0     33,340  Dbmslpcn.dll   14-Jan-2005  19:47  2000.80.1001.0  1,905,216  Dtspkg.dll   14-Jan-2005  19:47  2000.80.1001.0    528,960  Dtspump.dll         14-Jan-2005  19:47  2000.80.1001.0     41,536  Dtsrun.exe   14-Jan-2005  19:47  2000.80.1001.0  1,557,052  Dtsui.dll   14-Jan-2005  19:47  2000.80.1001.0    639,552  Dtswiz.dll   14-Jan-2005  19:47  2000.80.1001.0    352,828  Isqlw.exe   14-Jan-2005  19:47  2000.80.1001.0     82,492  Itwiz.exe   14-Jan-2005  19:47  2000.80.1001.0     90,692  Msgprox.dll   31-Dec-2004  19:16  8.11.41022.0      226,304  Mssdi98.dll         14-Jan-2005  19:47  2000.80.1001.0     62,024  Odsole70.dll   14-Jan-2005  19:48  2000.80.1001.0     25,144  Opends60.dll        14-Jan-2005  02:13                     17,576  Opends60.lib   14-Jan-2005  19:47  2000.80.1001.0     57,904  Osql.exe            14-Jan-2005  19:47  2000.80.1001.0    279,104  Pfutil80.dll        14-Jan-2005  19:47  2000.80.1001.0    143,940  Qrdrsvc.exe   14-Jan-2005  19:47  2000.80.1001.0    221,768  Replprov.dll   14-Jan-2005  19:47  2000.80.1001.0    307,784  Replrec.dll   14-Jan-2005  19:47  2000.80.1001.0    287,304  Rinitcom.dll        14-Jan-2005  19:47  2000.80.1001.0     78,416  Sdiclnt.dll         14-Jan-2005  19:47  2000.80.1001.0     66,112  Semmap.dll          14-Jan-2005  19:47  2000.80.1001.0     57,916  Semnt.dll           14-Jan-2005  19:47  2000.80.1001.0    492,096  Semobj.dll   14-Jan-2005  19:47  2000.80.1001.0     53,832  Snapshot.exe        14-Jan-2005  19:46  2000.80.1001.0     28,672  Sqlagent.dll   14-Jan-2005  19:47  2000.80.1001.0    311,872  Sqlagent.exe   14-Jan-2005  19:46  2000.80.1001.0    168,001  Sqlakw32.dll        14-Jan-2005  02:23                      4,352  Sqlakw32.lib   14-Jan-2005  19:47  2000.80.1001.0     33,344  Sqlctr80.dll   14-Jan-2005  19:47  2000.80.1001.0    815,676  Sqldata.dll   14-Jan-2005  19:47  2000.80.1001.0  4,215,360  Sqldmo.dll          14-Jan-2005  19:47                     25,172  Sqldumper.exe   14-Jan-2005  19:47  2000.80.1001.0    156,224  Sqlmaint.exe   14-Jan-2005  19:47  2000.80.1001.0    180,792  Sqlmap70.dll   14-Jan-2005  19:47  2000.80.1001.0    188,992  Sqlmmc.dll   14-Jan-2005  19:47  2000.80.1001.0    401,984  Sqlqry.dll   14-Jan-2005  19:47  2000.80.1001.0     57,920  Sqlrepss.dll   14-Jan-2005  19:48  2000.80.1001.0  7,721,041  Sqlservr.exe        14-Jan-2005  19:48  2000.80.1001.0    590,396  Sqlsort.dll   14-Jan-2005  19:48  2000.80.1001.0     45,644  Sqlvdi.dll   14-Jan-2005  19:48  2000.80.1001.0    106,588  Sqsrvres.dll        14-Jan-2005  19:48  2000.80.1001.0     33,340  Ssmsgnet.dll        14-Jan-2005  19:48  2000.80.1001.0     33,340  Ssmslpcn.dll        14-Jan-2005  19:48  2000.80.1001.0     33,340  Ssmsqlgc.dll        14-Jan-2005  19:48  2000.80.1001.0     33,340  Ssmssnet.dll        14-Jan-2005  19:48  2000.80.1001.0     82,492  Ssnetlib.dll        14-Jan-2005  19:48  2000.80.1001.0     25,148  Ssnmpn70.dll        14-Jan-2005  19:48  2000.80.1001.0    123,456  Stardds.dll         14-Jan-2005  19:48  2000.80.1001.0    158,240  Svrnetcn.dll   14-Jan-2005  19:47  2000.80.1001.0     76,416  Svrnetcn.exe   14-Jan-2005  19:48  2000.80.1001.0     49,228  Ums.dll   14-Jan-2005  19:48  2000.80.1001.0     74,304  Xplog70.dll   14-Jan-2005  19:48  2000.80.1001.0     98,872  Xpweb70.dll   14-Jan-2005  19:50                      6,466  Hotfix1.inf   14-Jan-2005  19:50                      2,524  Hotfix2.inf   31-Dec-2004  19:15  8.0.21213.0       352,256  Msvcr71.dll   31-Dec-2004  19:15  2000.80.796.0      57,904  Osql.exe            31-Dec-2004  19:15  2000.80.534.0     127,548  Sqdedev.dll   31-Dec-2004  19:15  2000.80.194.0     180,290  Sqlunirl.dll   14-Jan-2005  02:22  2000.80.1001.0    159,813  Replres.rll   14-Jan-2005  02:42  2000.80.1001.0    172,032  Semobj.rll   14-Jan-2005  02:02  2000.80.1001.0     28,672  Sqlevn70.rll   14-Jan-2005  02:28  2000.80.1001.0    479,232  Sqlmmc.rll
SQL Server 2000, 64-bit version
   Date         Time   Version         Size        File name      Platform   -----------------------------------------------------------------------   15-Jan-2005  02:40  2000.80.1001.0      56,832  Dbmslpcn.dll   IA-64   15-Jan-2005  02:39  2000.80.1001.0     528,960  Dtspump.dll    x86   15-Jan-2005  02:40  2000.80.1001.0     185,856  Msgprox.dll    IA-64   31-Dec-2004  19:10  8.11.41022.0       742,912  Mssdi98.dll    IA-64   15-Jan-2005  02:40  2000.80.1001.0     151,040  Odsole70.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0      27,136  Opends60.dll   IA-64   14-Jan-2005  19:58                      19,880  Opends60.lib   15-Jan-2005  02:40  2000.80.1001.0     148,992  Osql.exe       IA-64   15-Jan-2005  02:40  2000.80.1001.0     353,280  Qrdrsvc.exe    IA-64   15-Jan-2005  02:40  2000.80.1001.0     534,528  Replprov.dll   IA-64   15-Jan-2005  02:40  2000.80.1001.0     769,024  Replrec.dll    IA-64   15-Jan-2005  02:41  2000.80.1001.0     650,240  Rinitcom.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0     160,768  Semmap.dll     IA-64   15-Jan-2005  02:41  2000.80.1001.0     132,608  Semnt.dll   15-Jan-2005  02:40  2000.80.1001.0      88,576  Snapshot.exe   IA-64   15-Jan-2005  02:39  2000.80.1001.0      10,240  Sqlagent.dll   IA-64   15-Jan-2005  02:40  2000.80.1001.0   1,055,232  Sqlagent.exe   IA-64   15-Jan-2005  02:41  2000.80.1001.0      90,112  Sqlboot.dll   15-Jan-2005  02:41  2000.80.1001.0      32,256  Sqlctr80.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0     812,032  Sqldata.dll    IA-64   15-Jan-2005  02:41  2000.80.1001.0  13,845,504  Sqldmo.dll     IA-64   15-Jan-2005  02:40                      39,936  Sqldumper.exe   15-Jan-2005  02:40  2000.80.1001.0     493,568  Sqlmaint.exe   IA-64   15-Jan-2005  02:41  2000.80.1001.0      23,040  Sqlmap70.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0     152,064  Sqlrepss.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0  25,270,272  Sqlservr.exe   15-Jan-2005  02:41  2000.80.1001.0     616,960  Sqlsort.dll    IA-64   15-Jan-2005  02:41  2000.80.1001.0     120,320  Sqlvdi.dll   15-Jan-2005  02:41  2000.80.1001.0     227,328  Sqsrvres.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0      53,760  Ssmslpcn.dll   15-Jan-2005  02:41  2000.80.1001.0      59,904  Ssmsqlgc.dll   15-Jan-2005  02:41  2000.80.1001.0     256,000  Ssnetlib.dll   IA-64   15-Jan-2005  02:41  2000.80.1001.0      20,992  Ssnmpn70.dll   15-Jan-2005  02:41  2000.80.1001.0     430,080  Svrnetcn.dll   IA-64   15-Jan-2005  02:40  2000.80.1001.0     185,856  Svrnetcn.exe   15-Jan-2005  02:41  2000.80.1001.0     183,296  Xplog70.dll    IA-64   15-Jan-2005  02:41  2000.80.1001.0     187,392  Xpweb70.dll   15-Jan-2005  02:43                       5,065  Hotfix1.inf   31-Dec-2004  19:10  2000.80.962.0       57,904  Osql.exe       x86   31-Dec-2004  19:10  2000.80.760.0      269,824  Sqdedev.dll   14-Jan-2005  20:13  2000.80.1001.0     146,432  Replres.rll   14-Jan-2005  19:58  2000.80.1001.0      19,968  Sqlevn70.rll
Note Because of file dependencies, the most recent hotfix that contains these files may also contain additional files.back to the top
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in SQL Server 2000 Service Pack 4.

back to the top
MORE INFORMATION
The dynamic memory management architecture in SQL Server lets data pages and the procedure cache share the same buffer pool. Typically, this design works correctly because the Lazywriter process naturally ages out buffers in the buffer pool that are rarely being reused. However, when a high rate of incoming ad-hoc queries occurs, the procedure cache may become very large relative to the data cache. On a 64-bit computer, this behavior may cause the decrease in performance that is described in the "Symptoms" section.

This hotfix introduces an upper bound on how much of the overall buffer pool the procedure cache can use. By default, the upper bound is turned on in SQL Server 2000 64-bit. Also, the upper bound is set to the minimum value of 4 GB or 50 percent of the memory that is visible to SQL Server. The amount of memory that is visible to SQL Server is adjusted based on the Max Server Memory configuration setting. You can turn off the upper bound in SQL Server 2000 64-bit by using trace flag 2881.

By default, the upper bound is turned off in SQL Server 2000 32-bit. You can turn on the upper bound in SQL Server 2000 32-bit by using trace flag 2880.
MORE INFORMATION
For more 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 more information, 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
back to the top
Properties

Article ID: 891707 - Last Review: 01/17/2015 09:42:38 - Revision: 6.4

  • 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 Desktop Engine (Windows)
  • Microsoft SQL Server 2000 Enterprise Edition 64-bit
  • kbnosurvey kbarchive kbautohotfix kbbug kbfix kbhotfixserver kbqfe KB891707
Feedback