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Symptoms

Consider the following scenario:

  • A SQL Server process that uses the Microsoft .NET Framework 2.0 runs on a multiprocessor computer.

  • The garbage collection is triggered in the SQL Server process.

In this scenario, the CPU usage may increase to a high value for tens of seconds. However, the SQL Server process does not make any progress.

Cause

This issue occurs because the waiting mechanism for garbage collection does not correctly handle a scenario where the garbage collection thread and a lower priority SQL thread run on the same CPU.

Resolution

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only 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 software update that contains this hotfix.


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

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


Prerequisites

To apply this hotfix, you must have the .NET Framework 3.5 Service Pack 1 (SP1) installed on a computer that is running Windows 7 or Windows Server 2008 R2. 

Note The .NET Framework 3.5 Service Pack 1 (SP1) contains the .NET Framework 2.0 Service Pack 2 (SP2).

Restart requirement

You do not have to restart the computer after you apply this hotfix if the affected files are not being used.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

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.

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2 

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.5656

4,567,040

01-Mar- 2011

00:45

x64

Mscordacwks.dll

2.0.50727.5656

1,755,480

01-Mar-2011

00:45

x64

Mscorwks.dll

2.0.50727.5656

9,992,528

01- Mar-2011

00:45

x64

Sos.dll

2.0.50727.5656

485,192

01-Mar-2011

00:45

x64

For all supported IA-64-based versions of Windows Server 2008 R2 

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.5656

4,009,984

01-Mar-2011

00:40

IA- 64

Mscordacwks.dll

2.0.50727.5656

3,082,584

01-Mar-2011

00:40

IA-64

Mscorwks.dll

2.0.50727.5656

20,342,096

01-Mar- 2011

00:40

IA-64

Sos.dll

2.0.50727.5656

872,776

01-Mar-2011

00:40

IA-64

Additional file information

Additional file information for x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_mscorlib_b77a5c561934e089_6.1.7600.20912_none_3dbc37d282d8be93.manifest

File version

Not Applicable

File size

368,857

Date (UTC)

01-Mar-2011

Time (UTC)

09:41

File name

Amd64_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20912_none_a12729a6c8612eeb.manifest

File version

Not Applicable

File size

2,738

Date (UTC)

01-Mar- 2011

Time (UTC)

09:36

File name

Amd64_netfx- mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20912_none_a86306bff0602318.manifest

File version

Not Applicable

File size

6,927

Date (UTC)

01-Mar-2011

Time (UTC)

09:40

File name

Amd64_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20912_none_89f57167bc560b00.manifest

File version

Not Applicable

File size

2,010

Date (UTC)

01-Mar-2011

Time (UTC)

09:35

Additional file information for  IA-64-based versions of Windows Server 2008 R2

File name

Ia64_mscorlib_b77a5c561934e089_6.1.7600.20912_none_85694c6b97551f7d.manifest

File version

Not Applicable

File size

368,856

Date (UTC)

01-Mar-2011

Time (UTC)

09:38

File name

Ia64_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20912_none_e8d43e3fdcdd8fd5.manifest

File version

Not Applicable

File size

2,737

Date (UTC)

01-Mar- 2011

Time (UTC)

09:33

File name

Ia64_netfx- mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20912_none_f0101b5904dc8402.manifest

File version

Not Applicable

File size

6,926

Date (UTC)

01-Mar-2011

Time (UTC)

09:36

File name

Ia64_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20912_none_d1a28600d0d26bea.manifest

File version

Not Applicable

File size

2,009

Date (UTC)

01-Mar-2011

Time (UTC)

09:32

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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