FIX: An UPDATE or a DELETE statement that uses a join on a remote table in a linked server runs very slowly in Microsoft SQL Server 2005

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Article ID: 971529 - View products that this article applies to.
Microsoft distributes Microsoft SQL Server 2005 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 2005 fix release.
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SYMPTOMS

In Microsoft SQL Server 2005, you run an UPDATE or a DELETE statement that uses a join on a remote table in a linked server. The statement contains a filter on a column in the WHERE clause. When you run the query, the query runs very slowly.

When you examine the execution plan for the statement, you find that SQL Server 2005 uses the Remote Scan operator on the remote table. If you run a corresponding SELECT statement, the SELECT statement runs correctly. When you examine the execution plan for the SELECT statement, you find that SQL Server 2005 uses the Remote Query operator on the remote table.

CAUSE

This issue occurs because SQL Server 2005 uses the Remote Scan operator incorrectly in the execution plan. The SQL Server database engine pulls all the records from the remote table and sends them to the local server. This slows down the performance of the query.

RESOLUTION

The fix for this issue was first released in Cumulative Update 4 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:
970279 Cumulative update package 4 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.

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 list of builds that are available after SQL Server 2005 Service Pack 3, 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
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 how to obtain SQL Server 2005 Service Pack 3, click the following article number to view the article in the Microsoft Knowledge Base:
913089 How to obtain the latest service pack for SQL Server 2005
For more information about the new features and the new improvements in SQL Server 2005 Service Pack 3, visit the following Microsoft Web site:
http://go.microsoft.com/fwlink/?LinkId=131442
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: 971529 - Last Review: June 16, 2009 - Revision: 1.0
APPLIES TO
  • Microsoft SQL Server 2005 Standard Edition
  • Microsoft SQL Server 2005 Developer Edition
  • Microsoft SQL Server 2005 Enterprise Edition
  • Microsoft SQL Server 2005 Standard X64 Edition
  • Microsoft SQL Server 2005 Standard Edition for Itanium-based Systems
  • Microsoft SQL Server 2005 Enterprise X64 Edition
  • Microsoft SQL Server 2005 Enterprise Edition for Itanium-based Systems
  • Microsoft SQL Server 2005 Workgroup Edition
Keywords: 
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