FIX: The memory usage of a SQL Server service increases quickly when you run a query that uses a linked server in SQL Server 2005 or in SQL Server 2008

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Article ID: 971622 - 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.
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SYMPTOMS

In Microsoft SQL Server 2005 or in SQL Server 2008, you run a stored procedure on a remote server using linked server. After you run the stored procedures many times, you may find that the memory usage of the SQL Server service increases quickly. Additionally, the various error messages related depletion of memory in the MemTolLeave address space may be logged in SQL Server 2008 errorlog file.

Note You may also experience this issue when you use replication, log shipping or mirroring. These features may use stored procedures that use a linked server.

CAUSE

This issue is caused by a memory leak that occurs when you run a query that uses a linked server. The leak occurs when you call a remote stored procedure. There are two kinds of potential leaks:
  • The return value of the stored procedure call,which is always leaked. This is a small but regular leak.
  • A remote stored procedure call that has OUT parameters of the sqlvariant data type.

RESOLUTION

SQL Server 2008 Service Pack 1

The fix for this issue was first released in Cumulative Update 3 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:
971491 Cumulative update package 3 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 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.

SQL Server 2005 Service Pack 3

The fix for this issue was first released in Cumulative Update 6 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:
974648 Cumulative update package 6 for SQL Server 2005 Service Pack 3
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. 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:
960598 The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 3 was released
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.

The release version of SQL Server 2008

Important You must install this fix if you are running the release version of SQL Server 2008.

The fix for this issue was first released in Cumulative Update 8. 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:
975976 Cumulative update package 8 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.

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 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

MORE INFORMATION

SQL Server 2008 R2 BPA Information

The SQL Server 2008 R2 Best Practice Analyzer (SQL Server 2008 R2 BPA) provides a rule to detect situations in which the SQL Server instance has linked servers that are configured for use, and this fix is not applied. The SQL Server 2008 R2 BPA supports both SQL Server 2008 and SQL Server 2008 R2. 

If you run the BPA tool and encounter the warning, "Database Engine - linked server memory leak fix missing," you need to examine the symptoms mentioned in this article, and apply the Cumulative Update that is appropriate.

References

Collapse this tableExpand this table
Rule SoftwareRule TitleRule Identifier
SQL Server 2008 R2 BPA Rulelinked server memory leak fix missingRID3807





Properties

Article ID: 971622 - Last Review: October 9, 2011 - Revision: 4.0
APPLIES TO
  • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Enterprise
  • Microsoft SQL Server 2008 Workgroup
Keywords: 
kbsurveynew kbfix kbQFE kbExpertiseAdvanced KB971622

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