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Article ID: 2752432 - Last Review: January 24, 2013 - Revision: 5.0

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Symptoms

Assume that you query a binary large object (BLOB) column in Microsoft SQL Server 2008 R2 or in Microsoft SQL Server 2012 on a computer that has multiple CPUs. The query uses the NOLOCKhint. In this situation, you experience high CPU usage on the computer.

Note This issue is more likely to occur if the computer has 16 or more CPUs installed.

Cause

This issue occurs because a spinlock backoff algorithm is not efficient.

Resolution

Cumulative update information

Cumulative Update 2 for SQL Server 2012 SP1

The fix for this issue was first released in Cumulative Update 2. For more information about how to obtain this cumulative update package for SQL Server 2012 SP1, click the following article number to view the article in the Microsoft Knowledge Base:
2790947  (http://support.microsoft.com/kb/2790947/ ) Cumulative update package 2 for SQL Server 2012 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 2012 SP1 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:
2772858  (http://support.microsoft.com/kb/2772858/ ) The SQL Server 2012 builds that were released after SQL Server 2012 Service Pack 1 was released

Cumulative Update 5 for SQL Server 2012

The fix for this issue was first released in Cumulative Update 5. For more information about how to obtain this cumulative update package for SQL Server 2012, click the following article number to view the article in the Microsoft Knowledge Base:
2777772  (http://support.microsoft.com/kb/2777772/ ) Cumulative update package 5 for SQL Server 2012
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 2012 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:
2692828  (http://support.microsoft.com/kb/2692828/ ) The SQL Server 2012 builds that were released after SQL Server 2012 was released

SQL Server 2008 R2 Service Pack 2

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 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:
2754552  (http://support.microsoft.com/kb/2754552/ ) Cumulative update package 3 for SQL Server 2008 R2 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 2008 R2 Service Pack 2 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:
2730301  (http://support.microsoft.com/kb/2730301/ ) The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 2 was released

Status

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

Workaround

To work around the issue, use one of the following methods:
  • Decrease size of the binary large object column.
  • Remove the NOLOCKhint from the query.
  • Reduce the number of CPUs that SQL Server uses.

Applies to
  • Microsoft SQL Server 2008 R2 Standard
  • Microsoft SQL Server 2008 R2 Datacenter
  • Microsoft SQL Server 2008 R2 Enterprise
  • Microsoft SQL Server 2008 R2 Developer
  • Microsoft SQL Server 2012 Developer
  • Microsoft SQL Server 2012 Enterprise
  • Microsoft SQL Server 2012 Express
  • Microsoft SQL Server 2012 Standard
  • Microsoft SQL Server 2012 Web
  • SQL Server 2012 Enterprise Core
Keywords: 
kbqfe kbfix kbsurveynew kbexpertiseadvanced KB2752432
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