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SQL Server 2008 R2 Cumulative Update 2, SQL Server 2008 SP1 Cumulative Update 7 and SQL Server 2005 SP3 Cumulative Update 9 introduce trace flag 4136 that can be used to disable the "parameter sniffing" processArticle ID: 980653 - View products that this article applies to. 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. On This PageINTRODUCTIONMicrosoft SQL Server 2008 R2 Cumulative Update 2, SQL Server 2008 Service Pack 1 (SP1) Cumulative Update 7 and Microsoft SQL Server 2005 Service Pack 3 (SP3) Cumulative Update 9 introduce trace flag 4136, which can be used to control the "parameter sniffing" process. More information about parameter sniffing can be found in the following blog post: http://blogs.msdn.com/b/queryoptteam/archive/2006/03/31/565991.aspx.
(http://blogs.msdn.com/b/queryoptteam/archive/2006/03/31/565991.aspx)
Enabling trace flag 4136 disables parameter sniffing, which is equivalent to adding an OPTIMIZE FOR UNKNOWN hint to each query which references a parameter. Queries that meet any of the following conditions still undergo parameter sniffing even if the trace flag is set.
MORE INFORMATIONSQL Server 2005This feature was first released in Cumulative Update 9 for SQL Server 2005 Service Pack 3. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base:980176 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 2005 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:
(http://support.microsoft.com/kb/980176/LN/
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Cumulative update package 9 for SQL Server 2005 Service Pack 3960598
Microsoft SQL Server 2005 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2005 Service Pack 3 hotfix to an installation of SQL Server 2005 Service Pack 3. By default, any hotfix that is provided in a SQL Server service pack is included in the next SQL Server service pack.
(http://support.microsoft.com/kb/960598/LN/
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The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 3 was released
SQL Server 2008This feature was also released in Cumulative Update 7 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:979065 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:
(http://support.microsoft.com/kb/979065/LN/
)
Cumulative update package 7 for SQL Server 2008 Service Pack 1970365
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.
(http://support.microsoft.com/kb/970365/LN/
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The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 1 was released
SQL Server 2008 R2This feature was also released in Cumulative Update 2 for SQL Server 2008 R2. For more information about how to obtain this cumulative update package for SQL Server 2008 R2, click the following article number to view the article in the Microsoft Knowledge Base:2072493 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 R2 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:
(http://support.microsoft.com/kb/2072493/
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Cumulative update package 2 for SQL Server 2008 R2981356
(http://support.microsoft.com/kb/981356/
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The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 was releasedREFERENCESFor more information about the "parameter sniffing" process, refer to the "Compilations, recompilations, and parameter sniffing" section of the following Microsoft TechNet Web site: Batch compilation, recompilation, and plan caching issues in SQL Server 2005 For information about the Incremental Servicing Model for SQL Server, click the following article number to view the article in the Microsoft Knowledge Base:
(http://technet.microsoft.com/en-us/library/cc966425.aspx#XSLTsection133121120120)
935897 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:
(http://support.microsoft.com/kb/935897/
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An Incremental Servicing Model is available from the SQL Server team to deliver hotfixes for reported problems
822499
(http://support.microsoft.com/kb/822499/
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New naming schema for Microsoft SQL Server software update packagesFor 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/
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Description of the standard terminology that is used to describe Microsoft software updatesPropertiesArticle ID: 980653 - Last Review: January 10, 2011 - Revision: 6.0 APPLIES TO
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