This article describes the following about this hotfix release:

•	The issues that are fixed by the hotfix package
•	The prerequisites for installing the hotfix package
•	Information about whether you must restart the computer after you install the hotfix package
•	Information about whether the hotfix package is replaced by any other hotfix package
•	Information about whether you must make any registry changes
•	The files that are contained in the hotfix package

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When you log in to an instance of SQL Server 2005, error messages that resemble the following are logged in the SQL Server Errorlog file:Additionally, error messages that resemble the following may be logged in the SQL Server Errorlog file if an existing connection is reused in the connection pool:When this problem occurs, you may also experience the following symptoms:

•	High CPU usage occurs.
•	The Microsoft Windows operating system frequently performs context switches.

This problem occurs when SQL Server handles many concurrent connections on a computer that has many processors installed. Additionally, a time-out may occur when you run a query.

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This problem occurs because memory allocation contention causes a slowdown on the login process or the query execution process.

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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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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 Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site: 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. To create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" section and the online request forms display 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.

Prerequisites

You must have SQL Server 2005 Service Pack 2 (SP2) installed to apply this hotfix.

For more information about how to obtain SQL Server 2005 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

Restart information

You do not have to restart the computer after you apply this hotfix.

Registry information

You do not have to change the registry.

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 item in Control Panel.

SQL Server 2005 32-bit version

File name	File version	File size	Date	Time	Platform
Microsoft.sqlserver.maintenanceplantasks.dll	9.0.3171.0	296,304	21-May-2007	20:12	x86
Msmdlocal.dll	9.0.3171.0	15,943,536	21-May-2007	20:12	x86
Mssqlsystemresource.ldf	Not applicable	524,288	21-May-2007	17:23	Not applicable
Mssqlsystemresource.mdf	Not applicable	40,173,568	21-May-2007	17:23	Not applicable
Rdistcom.dll	2005.90.3171.0	644,464	21-May-2007	20:12	x86
Sqlaccess.dll	2005.90.3171.0	350,576	21-May-2007	20:12	x86
Sqlservr.exe	2005.90.3171.0	29,190,000	21-May-2007	20:12	x86
Sysdbupg.sql	Not applicable	510,622	10-May-2007	15:40	Not applicable

SQL Server 2005 x64-based version

File name	File version	File size	Date	Time	Platform
Microsoft.sqlserver.maintenanceplantasks.dll	9.0.3171.0	296,304	21-May-2007	20:12	x86
Msmdlocal.dll	9.0.3171.0	15,943,536	21-May-2007	20:12	x86
Mssqlsystemresource.ldf	Not applicable	524,288	21-May-2007	17:23	Not applicable
Mssqlsystemresource.mdf	Not applicable	40,173,568	21-May-2007	17:23	Not applicable
Rdistcom.dll	2005.90.3171.0	828,272	22-May-2007	08:15	x64
Sqlaccess.dll	2005.90.3171.0	357,744	22-May-2007	08:15	x86
Sqlservr.exe	2005.90.3171.0	39,538,544	22-May-2007	08:15	x64
Sysdbupg.sql	Not applicable	510,622	10-May-2007	15:40	Not applicable

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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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: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

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