FIX: When an ADO.NET-connected application uses the System.Data.SqlClient namespace, the application may experience high CPU use and may stop responding

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SYMPTOMS

When a Microsoft ADO.NET-connected application uses the System.Data.SqlClient namespace, the application may experience high CPU use. Also, the application may stop responding.

This problem may occur if the following conditions are true:

The ADO.NET-connected application is in a high-stress scenario.
The ADO.NET-connected application has sent an attention signal to Microsoft SQL Server. (The attention signal is usually sent in response to a query time-out.)
The client connection shuts down before it receives the acknowledgement of the attention signal from SQL Server.

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RESOLUTION

To resolve this issue, download the appropriate file for your computer:

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For an x86-based computer

The following file is available for download from the Microsoft Download Center:
http://download.microsoft.com/download/2/C/5/2C5BCDC9-3241-443A-9F96-4E0B0EDFA727/NDP20-KB916002-X86.exe (http://download.microsoft.com/download/2/c/5/2c5bcdc9-3241-443a-9f96-4e0b0edfa727/ndp20-kb916002-x86.exe)

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For an x64-based computer

The following file is available for download from the Microsoft Download Center:
http://download.microsoft.com/download/D/3/9/D39C79DF-4158-45DF-9031-92C52AB0ED19/NDP20-KB916002-X64.exe (http://download.microsoft.com/download/d/3/9/d39c79df-4158-45df-9031-92c52ab0ed19/ndp20-kb916002-x64.exe)

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For an Itanium-based computer

The following file is available for download from the Microsoft Download Center:
http://download.microsoft.com/download/0/0/3/00392DD3-5B4F-4D99-94E8-6827B8F8D7EF/NDP20-KB916002-IA64.exe (http://download.microsoft.com/download/0/0/3/00392dd3-5b4f-4d99-94e8-6827b8f8d7ef/ndp20-kb916002-ia64.exe) For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 (http://support.microsoft.com/kb/119591/ ) How to obtain Microsoft support files from online services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

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STATUS

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

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MORE INFORMATION

For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

912151 (http://support.microsoft.com/kb/912151/ ) FIX: The connection may time out before the first try to connect to the failover partner server when you try to connect to a SQL Server 2005 mirrored database by using an ADO.NET 2.0-based application

912732 (http://support.microsoft.com/kb/912732/ ) FIX: An error may occur when you start a new transaction in ADO.NET 2.0 on a connection that is open to a SQL Server 2005 database

913177 (http://support.microsoft.com/kb/913177/ ) FIX: You may receive an error message when an ADO.NET-connected application uses the SqlBulkCopy class

913764 (http://support.microsoft.com/kb/913764/ ) FIX: Error message when you try to run a UNION ALL query or to call the DeriveParameters method: "Internal connection fatal error"

913765 (http://support.microsoft.com/kb/913765/ ) FIX: An SqlException exception may occur when you call one of the Execute methods on the instance of the SqlCommand class in an ADO.NET 2.0 application

913766 (http://support.microsoft.com/kb/913766/ ) FIX: A DateTime column that does not contain any data is incorrectly represented by a DateTime.MinValue field when a .NET Framework 2.0 DataSet object is deserialized on a client computer

824684 (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

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