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FIX: The Processes pane in the Activity Monitor incorrectly shows sessions as head blockers in SQL Server 2008

Bug #: 50003467(SQL Hotfix)

Microsoft distributes Microsoft SQL Server 2008 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release.
SYMPTOMS
When you expand the Processes pane in the Activity Monitor in Microsoft SQL Server 2008 Management Studio, you see an incorrect value of 1 in the Head Blocker column for sessions that are not blocking other processes.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
RESOLUTION
The fix for this issue was first released in Cumulative Update 1. For more information about how to obtain this cumulative update package for SQL Server 2008, click the following article number to view the article in the Microsoft Knowledge Base:
956717 Cumulative update package 1 for SQL Server 2008
Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2008 fix release. We recommend that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
956909 The SQL Server 2008 builds that were released after SQL Server 2008 was released
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
MORE INFORMATION
Generally, you can safely ignore processes that indicate a value of 1 as the head blocker if the process is not running or if the process does not display a wait type.

For more information about how to monitor blocking, click the following article number to view the article in the Microsoft Knowledge Base:
271509 How to monitor blocking in SQL Server 2005 and in SQL Server 2000
For more information about what files are changed, and for information about any prerequisites to apply the cumulative update package that contains the hotfix that is described in this Microsoft Knowledge Base article, click the following article number to view the article in the Microsoft Knowledge Base:
956717 Cumulative update package 1 for SQL Server 2008
REFERENCES
For more information about the list of builds that are available after the release of SQL Server 2008, click the following article number to view the article in the Microsoft Knowledge Base:
956909 The SQL Server 2008 builds that were released after SQL Server 2008 was released
For more information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
935897 An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems
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:
822499New naming schema for Microsoft SQL Server software update packages
For more information about software update terminology, 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
SQL2008RelNoteTools
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Article ID: 955943 - Last Review: 03/19/2009 22:32:16 - Revision: 3.0

Microsoft SQL Server 2008 Standard, Microsoft SQL Server 2008 Standard Edition for Small Business, Microsoft SQL Server 2008 Developer, Microsoft SQL Server 2008 Enterprise, Microsoft SQL Server 2008 Workgroup, Microsoft SQL Server 2008 Web

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