FIX: Deadlocks may occur when you run multiple jobs concurrently to rebuild indexes offline in SQL Server 2008

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Article ID: 978250 - View products that this article applies to.
Microsoft distributes Microsoft SQL Server 2008 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 2008 fix release.
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SYMPTOMS

Consider the following scenario:
  • In Microsoft SQL Server 2008, you run multiple jobs concurrently.
  • The jobs run the ALTER INDEX statements to rebuild indexes offline, and these indexes are on different tables. To rebuild indexes offline, the ALTER INDEX statements have the ONLINE option set to OFF.
  • Each of these tables maintains referential integrity to one or more of the other tables.
In this scenario, deadlocks may occur among the threads that are running the jobs. Additionally, the following error messages are logged in the SQL Server 2008 error log file:
Deadlock encountered .... Printing deadlock information
Wait-for graph
NULL
Node:1
OBJECT: 10:101575400:0 CleanCnt:2 Mode:Sch-M Flags: 0x1
Grant List 0:
Owner:0x00000000915E3980 Mode: Sch-M Flg:0x40 Ref:1 Life:02000000 SPID:68 ECID:0 XactLockInfo: 0x0000000091D90ED0
SPID: 68 ECID: 0 Statement Type: ALTER INDEX Line #: 1
Input Buf: Language Event: <ALTER INDEX Statement>
Requested by:
ResType:LockOwner Stype:'OR'Xdes:0x00000000905E2E90 Mode: Sch-M SPID:66 BatchID:0 ECID:0 TaskProxy:(0x000000008FF40538)
Value:0x801443c0 Cost:(0/1500)
NULL
Node:2
OBJECT: 10:149575571:0 CleanCnt:2 Mode:Sch-M Flags: 0x1
Grant List 1:
Owner:0x00000000915E16C0 Mode: Sch-M Flg:0x40 Ref:1 Life:02000000 SPID:66 ECID:0 XactLockInfo: 0x00000000905E2ED0
SPID: 66 ECID: 0 Statement Type: ALTER INDEX Line #: 1
Input Buf: Language Event: <ALTER INDEX Statement>
Requested by:
ResType:LockOwner Stype:'OR'Xdes:0x0000000091D90E90 Mode: Sch-M SPID:68 BatchID:0 ECID:0 TaskProxy:(0x000000008FADE538)
Value:0x80141040 Cost:(0/1700)
NULL
Victim Resource Owner:
ResType:LockOwner Stype:'OR'Xdes:0x00000000905E2E90 Mode: Sch-M SPID:66 BatchID:0 ECID:0 TaskProxy:(0x000000008FF40538)
Value:0x801443c0 Cost:(0/1500)

Note This issue does not occur in Microsoft SQL Server 2005.

CAUSE

The deadlocks occur because the server has schema locks on the tables when these tables reference other tables that are being indexed.

RESOLUTION

The fix for this issue was first released in Cumulative Update 6 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:
977443 Cumulative update package 6 for SQL Server 2008 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 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:
970365 The SQL Server 2008 builds that were released after SQL Server 2008 Service Pack 1 was released
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.

STATUS

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

REFERENCES

For 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 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: 978250 - Last Review: January 18, 2010 - Revision: 1.0
APPLIES TO
  • Microsoft SQL Server 2008 Standard
  • Microsoft SQL Server 2008 Enterprise
  • Microsoft SQL Server 2008 Developer
  • Microsoft SQL Server 2008 Workgroup
Keywords: 
kbexpertiseadvanced kbsurveynew kbqfe kbfix KB978250

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