Article ID: 976935 - Last Review: November 16, 2009 - Revision: 1.1

FIX: The execution of a parameterized CTE-based query takes a long time to complete in SQL Server 2008

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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

In Microsoft SQL Server 2008, you run a common table expression (CTE)-based query that is parameterized. However, the execution of the query may take longer to complete than when it is not parameterized.

For example, consider the following scenario:
  • You have a database that has the PARAMETERIZATION option set to FORCED.
  • In this database, you run a CTE-based query.
In this scenario, the query may run much slower than if the query is running in a database that has the PARAMETERIZATION option set to SIMPLE.
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CAUSE

This problem occurs because the parameterization of the CTE query generates a suboptimal execution plan.
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RESOLUTION

The fix for this issue was first released in Cumulative Update 5 for SQL Server 2008 Service Pack 1. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:
975977  (http://support.microsoft.com/kb/975977/LN/ ) Cumulative update package 5 for SQL Server 2008 Service Pack 1
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. Microsoft recommends 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:
970365  (http://support.microsoft.com/kb/970365/LN/ ) The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 1 was released
Microsoft SQL Server 2008 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2008 Service Pack 1 hotfix to an installation of SQL Server 2008 Service Pack 1. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.

After you apply the hotfix, you need to enable trace flag 4199 to enable the fix. You can enable the trace flag by running the "DBCC TRACEON(4199, -1)" command or by using the "-T" startup parameter.
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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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REFERENCES

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  (http://support.microsoft.com/kb/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  (http://support.microsoft.com/kb/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  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates
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APPLIES TO
  • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 Enterprise
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Workgroup
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Keywords: 
kbexpertiseadvanced kbsurveynew kbqfe kbfix KB976935
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