FIX: A non-yielding scheduler error or an error 8623 occurs when you run a query that contains a large IN clause in SQL Server 2005, SQL Server 2008, or SQL Server 2008 R2

In Microsoft SQL Server 2005, Microsoft SQL Server 2008, or Microsoft SQL Server 2008 R2, you have a query that contains a large IN clause. For example, the IN clause contains thousands of values. When you run this query, a non-yielding scheduler error may occur. Additionally, a mini-dump file is generated in the SQL Server 2005, SQL Server 2008, or SQL Server 2008 R2 log folder. Sometimes you may also see the following error message in the SQL Server Error log file:
Note If Error 8623 occurs together with the non-yielding scheduler error, the execution of the query fails.

This problem occurs because of an issue in the SQL Server code base. During the execution of the query that contains the large IN clause, the SQL Server code base does not yield a scheduler appropriately. This behavior causes CPU starvation for other worker threads that run on the same scheduler and causes a non-yielding scheduler error.

Cumulative update information

SQL Server 2005

The fix for this issue was first released in Cumulative Update 10. For more information about how to obtain this cumulative update package for SQL Server 2005, click the following article number to view the article in the Microsoft Knowledge Base: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:

SQL Server 2008 Service Pack 1

The fix for this issue was first released in Cumulative Update 9 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: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: 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 2008 Service Pack 2

The fix for this issue was first released in Cumulative Update 1 for SQL Server 2008 Service Pack 2. For more information about this cumulative update package, click the following article number to view the article in the Microsoft Knowledge Base: 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:

SQL Server 2008 R2

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

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Note After you install this hotfix, if the IN clause is large enough, error 8623 will still occur because of resource exhaustion. If error 8623 still occurs after you install this hotfix, use one of the following methods:

Method 1

Decrease the number of the values in the IN clause.

Method 2

Input the values in the IN clause into a temporary table or a table variable, and then query the result set that joins the original table and the temporary table (or table variable).

Prerequisites

You must have SQL Server 2005 Service Pack 3 (SP3), SQL Server 2008, or SQL Server 2008 R2 installed to apply this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix if one of the SQL Server services is running when you apply this hotfix. If you do not want to restart the computer, stop all the SQL Server services before you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

x86-based versions of SQL Server 2005

x64-based versions of SQL Server 2005

IA-64-based versions of SQL Server 2005

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: