FIX: Memory leak if you enable the AUTO_UPDATE_STATISTICS_ASYNC statistics option in SQL Server 2008, in SQL Server 2012 or in SQL Server 2008 R2

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Article ID: 2778088 - View products that this article applies to.
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Symptoms

When you enable the Auto Update Statistics Asynchronously statistics option in a database of Microsoft SQL Server 2012, Microsoft SQL Server 2008 or Microsoft SQL Server 2008 R2, and then you run queries on the database, a memory leak occurs.

The memory structure that is leaked is about 80bytes and it every time you submit a task to update stats async which is per object. The symptom of this leak can be seen in DBCC MEMORYSTATUS from the Resource Global Memory Object. You can monitor this leak using the following query to determine the memory allocated in KB for the Resource Global memory object:

SQL Server 2012

select [Memory Used KB] = pages_in_bytes /1024 from sys.dm_os_memory_objects where type = 'MEMOBJ_RESOURCE'
SQL Server 2008

select [Memory Used KB] = (pages_allocated_count * page_size_in_bytes)/1024 from sys.dm_os_memory_objects where type = 'MEMOBJ_RESOURCE'





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 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 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 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 The SQL Server 2012 builds that were released after SQL Server 2012 was released

Cumulative Update 4 for SQL Server 2008 R2 SP2

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 2008 R2 SP 2, click the following article number to view the article in the Microsoft Knowledge Base:
2777358 Cumulative update package 4 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 SP 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 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 2 was released

Cumulative update package 10 for SQL Server 2008 R2 Service Pack 1

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 2008 R2 SP1, click the following article number to view the article in the Microsoft Knowledge Base:
2783135 Cumulative update package 10 for SQL Server 2008 R2 SP1
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 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:
2567616 The SQL Server 2008 R2 builds that were released after SQL Server 2008 R2 Service Pack 1 was released

Cumulative update 8 for SQL Server 2008 Service Pack 3 (SP3)

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 Service Pack 3, click the following article number to view the article in the Microsoft Knowledge Base:
2771833 Cumulative update package 8 for SQL Server 2008 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 2008 Service Pack 3 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:
2629969 The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 3 was released

Status

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

Properties

Article ID: 2778088 - Last Review: January 24, 2013 - Revision: 4.0
Applies to
  • Microsoft SQL Server 2008 Service Pack 3, when used with:
    • Microsoft SQL Server 2008 Enterprise
    • Microsoft SQL Server 2008 Developer
    • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 R2 Datacenter
  • Microsoft SQL Server 2008 R2 Developer
  • Microsoft SQL Server 2008 R2 Enterprise
  • Microsoft SQL Server 2008 R2 Express
  • Microsoft SQL Server 2008 R2 Standard
  • Microsoft SQL Server 2008 R2 Web
  • Microsoft SQL Server 2008 R2 Workgroup
  • 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 KB2778088

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