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Article ID: 293232 - Last Review: October 9, 2003 - Revision: 3.1

This article was previously published under Q293232
BUG #: 352575, 352695 (SHILOH)


Parallel queries may experience an undetected deadlock when the lock owner Execution Context (EC) is waiting on a CXPACKET.

For the deadlock to occur you must have two spids and each spid must be running a parallel query.

The sysprocesses output shows multiple ECs (working on the behalf of a single spid) with some waiting on locks and others waiting on CXPACKET.

The pattern is such that no direct EC correlation from either spid results in a standard lock waiter deadlock. Each lock waiter is blocked by an owner waiting on a CXPACKET resource. You can use information gathered from a query of the syslockinfo system table to verify this pattern.

To determine if the SQL Server is encountering the issue, use these steps:
  1. Perform a "SELECT *" query from the sysprocesses system table, and then perform a "SELECT *" query from the syslockinfo system table.
  2. Locate a blocked EC that is waiting on a lock.
  3. Search the output to see who owns the lock.
  4. Determine if the owning EC is waiting on a CXPACKET.
  5. Repeat steps 1 through 4 for all of the ECs of the two suspect spids.
The pattern must be all blocking lock owners that are waiting on a CXPACKET.


To resolve this problem, obtain the latest service pack for SQL Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
290211  ( ) INF: How to Obtain the Latest SQL Server 2000 Service Pack


The English version of this fix should have the following file attributes or later:
   File name   Platform
   s80263i.exe INTEL
NOTE: Due to file dependencies, the most recent hotfix or feature that contains the preceding files may also contain additional files.


To resolve the deadlock situation use either:
  • A query timeout.


  • A Transact-SQL KILL command.


Microsoft has confirmed that this is a problem in SQL Server 2000. This problem was first corrected in SQL Server 2000 Service Pack 1.

  • Microsoft SQL Server 2000 Standard Edition
kbbug kbfix kbqfe kbsqlserv2000sp1fix KB293232
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