FIX: An XML query that contains the @Table variable or the @XML variable takes a long time to complete in SQL Server 2008

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Article ID: 957205 - View products that this article applies to.
Bug #: 50003203 (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.
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SYMPTOMS

Consider the following scenario:
  • You run an XML query on a Microsoft SQL Server 2008-based server.
  • The XML query contains the @Table variable or the @XML variable.
In this scenario, the query may take a long time to complete. If you run the same XML query on a Microsoft SQL Server 2005-based server, the query is returned much faster.

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

WORKAROUND

To work around this problem, use the sp_dbcmptlevel stored procedure or the ALTER DATABASE Compatibility Level command to set the database compatibility level to a value of 90.

STATUS

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

MORE INFORMATION

To enable this hotfix, you must turn on trace flag 4130.

For more information about how to turn on a trace flag, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn.microsoft.com/en-us/library/ms188396.aspx
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 sp_dbcmptlevel stored procedure, visit the following Microsoft MSDN Web site:
http://msdn.microsoft.com/en-us/library/ms178653.aspx
For more information about the ALTER DATABASE Compatibility Level command, visit the following Microsoft MSDN Web site:
http://msdn.microsoft.com/en-us/library/bb510680.aspx
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:
822499 New 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

Properties

Article ID: 957205 - Last Review: October 15, 2008 - Revision: 2.0
APPLIES TO
  • Microsoft SQL Server 2008 Workgroup
  • Microsoft SQL Server 2008 Enterprise
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Standard
Keywords: 
kbperformance kbexpertiseadvanced kbqfe kbfix KB957205

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