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FIX: A Deadlock Occurs If You Run an Explicit UPDATE STATISTICS Command

BUG #: 470125 (SHILOH_BUGS)
If you run an explicit UPDATE STATISTICS command against the same table from two different connections at the same time, the two connections may deadlock. One of the connections receives the following error message, and its UPDATE STATISTICS command is canceled:
Server: Msg 1205, Level 13, State 50, Line 3
Transaction (Process ID 52) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
Deadlocks and their accompanying 1205 errors are not unique to this situation. Deadlocks may also occur in many other, unrelated scenarios. If you enable trace flag 1204 to capture more details about this particular deadlock, you see the two connections deadlocked on clustered index KEY resources on the sysindexes table (object ID 2). One of the two connections tries to convert a shared lock to an update lock, and trace flag 1204 output reports the statement type for both connections as UPDATE STATISTICS.

Service pack information

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

Hotfix information

The English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.
   Date         Time   Version            Size    File name   -------------------------------------------------------------------   31-May-2003  18:45  2000.80.818.0      78,400  Console.exe         25-Jun-2003  01:01  2000.80.818.0      33,340  Dbmslpcn.dll        25-Apr-2003  02:12                    786,432  Distmdl.ldf   25-Apr-2003  02:12                  2,359,296  Distmdl.mdf   30-Jan-2003  01:55                        180  Drop_repl_hotfix.sql   23-Jun-2003  22:40  2000.80.837.0   1,557,052  Dtsui.dll           23-Jun-2003  22:40  2000.80.837.0     639,552  Dtswiz.dll          24-Apr-2003  02:51                    747,927  Instdist.sql   03-May-2003  01:56                      1,581  Inst_repl_hotfix.sql   08-Feb-2003  06:40  2000.80.765.0      90,692  Msgprox.dll         01-Apr-2003  02:07                      1,873  Odsole.sql   05-Apr-2003  01:46  2000.80.800.0      62,024  Odsole70.dll        07-May-2003  20:41  2000.80.819.0      25,144  Opends60.dll        02-Apr-2003  21:48  2000.80.796.0      57,904  Osql.exe            02-Apr-2003  23:15  2000.80.797.0     279,104  Pfutil80.dll        04-Aug-2003  18:17                    550,780  Procsyst.sql   22-May-2003  22:57                     19,195  Qfe469571.sql   11-Jul-2003  17:04                  1,084,147  Replmerg.sql   04-Apr-2003  21:53  2000.80.798.0     221,768  Replprov.dll        08-Feb-2003  06:40  2000.80.765.0     307,784  Replrec.dll         13-Aug-2003  16:28                  1,086,797  Replsys.sql   13-Aug-2003  16:28                    986,603  Repltran.sql   29-Jul-2003  20:13  2000.80.819.0     492,096  Semobj.dll          31-May-2003  18:27  2000.80.818.0     172,032  Semobj.rll   05-Aug-2003  21:06                    127,884  Sp3_serv_uni.sql   01-Jun-2003  01:01  2000.80.818.0   4,215,360  Sqldmo.dll          07-Apr-2003  17:44                     25,172  Sqldumper.exe       19-Mar-2003  18:20  2000.80.789.0      28,672  Sqlevn70.rll   02-Jul-2003  00:18  2000.80.834.0     180,736  Sqlmap70.dll        08-Feb-2003  06:40  2000.80.765.0      57,920  Sqlrepss.dll        13-Aug-2003  20:04  2000.80.851.0   7,598,161  Sqlservr.exe        25-Jul-2003  21:44  2000.80.845.0     590,396  Sqlsort.dll         08-Feb-2003  06:40  2000.80.765.0      45,644  Sqlvdi.dll          25-Jun-2003  01:01  2000.80.818.0      33,340  Ssmslpcn.dll        01-Jun-2003  01:01  2000.80.818.0      82,492  Ssnetlib.dll        01-Jun-2003  01:01  2000.80.818.0      25,148  Ssnmpn70.dll        01-Jun-2003  01:01  2000.80.818.0     158,240  Svrnetcn.dll        31-May-2003  18:59  2000.80.818.0      76,416  Svrnetcn.exe        30-Apr-2003  23:52  2000.80.816.0      45,132  Ums.dll             02-Jul-2003  00:19  2000.80.834.0      98,816  Xpweb70.dll
Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.

This fix is SQL Server build number 851, and it can only be applied to a computer that is running SQL Server 2000 Service Pack 3 (SP3) or a hotfix build that is based on SQL Server SP3.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.
To work around this problem, do not run UPDATE STATISTICS from two connections at the same time against the same table.
This problem only occurs for explicit UPDATE STATISTICS commands or for the sp_updatestats stored procedure. (The sp_updatestats stored procedure runs UPDATE STATISTICS.) This problem does not occur because of the auto update statistics or the auto create statistics database options or because of explicit CREATE STATISTICS commands. This hotfix serializes UPDATE STATISTICS commands that act on the same table, in the same way that statistics creation and auto update statistics events are already serialized.

Article ID: 826754 - Last Review: 11/02/2007 10:19:26 - Revision: 7.3

  • Microsoft SQL Server 2000 Developer Edition
  • Microsoft SQL Server 2000 Standard Edition
  • Microsoft SQL Server 2000 Enterprise Edition
  • Microsoft SQL Server 2000 Personal Edition
  • Microsoft SQL Server 2000, Workgroup Edition
  • Microsoft SQL Server 2000 Desktop Engine (Windows)
  • Microsoft SQL Server 2000 Enterprise Edition 64-bit
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