FIX: When you run a stored procedure that uses some views in SQL Server 2005, the performance is slow compared to SQL Server 2000 if the views use the JOIN operator and contain subqueries

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Article ID: 942906 - View products that this article applies to.
Bug: #50001859 (SQL Hotfix)
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

When you run a stored procedure that uses some views that contain subqueries in Microsoft SQL Server 2005, the performance is slower compared to Microsoft SQL Server 2000. This problem occurs if the views use the JOIN operator.

CAUSE

This problem occurs because SQL Server 2005 generates a poor execution plan for this stored procedure. In the execution plan that SQL Server 2005 generates, SQL Server 2005 uses a Table Spool operator. The Table Spool operator returns many rows. Therefore, SQL Server 2005 takes longer to process these rows. However, in the execution plan that SQL Server 2000 generates, SQL Server 2000 uses a Filter operator. The Filter operator returns fewer rows.

RESOLUTION

The fix for this issue was first released in Cumulative Update 4. For more information about how to obtain this cumulative update package for SQL Server 2005 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:
941450 Cumulative update package 4 for SQL Server 2005 Service Pack 2
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:
937137 The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 2 was released
Microsoft SQL Server 2005 hotfixes are created for specific SQL Server service packs. You must apply a SQL Server 2005 Service Pack 2 hotfix to an installation of SQL Server 2005 Service Pack 2. 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.

MORE INFORMATION

After you apply this hotfix, you must turn on trace flag 9082 to enable this hotfix. To turn on trace flag 9082, you must run the following statement.
DBCC TRACEON (9082,-1)
You must also add this trace flag as a startup parameter to enable this hotfix permanently.

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:
941450 Cumulative update package 4 for SQL Server 2005 Service Pack 2

REFERENCES

For more information about the list of builds that are available after SQL Server Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:
937137 The SQL Server 2005 builds that were released after SQL Server 2005 Service Pack 2 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 2, 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 improvements in SQL Server 2005 Service Pack 2, visit the following Microsoft Web site:
http://go.microsoft.com/fwlink/?LinkId=71711
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: 942906 - Last Review: August 8, 2008 - Revision: 2.0
APPLIES TO
  • Microsoft SQL Server 2005 Enterprise Edition
  • Microsoft SQL Server 2005 Developer Edition
  • Microsoft SQL Server 2005 Workgroup Edition
  • Microsoft SQL Server 2005 Standard Edition
Keywords: 
kbhotfixrollup kbfix kbpubtypekc kbqfe kbexpertiseadvanced KB942906

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