FIX: Dynamic cursor retrieves the same row two times when you update the non-clustered index key to the same value

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Article ID: 843267 - View products that this article applies to.
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SYMPTOMS

A dynamic cursor retrieves the same row two times when all the following conditions are true:
  • The dynamic cursor has an order-by clause that matches a non-clustered index.
  • One or more key columns is updated to the same value that the column currently has. The key columns in the non-clustered index are used to specify order.
  • One or more key columns can be assigned a null value,

RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Microsoft SQL Server 2000. For more 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 file attributes) 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
   --------------------------------------------------------------


   08-Jun-2004  17:14  2000.80.949.0     664,128  Autoplt.dll      
   08-Jun-2004  17:14  2000.80.949.0      78,400  Console.exe      
   08-Jun-2004  17:14  2000.80.949.0     315,968  Custtask.dll     
   08-Jun-2004  17:14  2000.80.949.0      33,340  Dbmslpcn.dll     
   08-Apr-2004  21:42                    786,432  Distmdl.ldf
   08-Apr-2004  21:42                  2,359,296  Distmdl.mdf
   10-Oct-2003  18:48                        180  Drop_repl_hotfix.sql
   08-Jun-2004  17:14  2000.80.949.0   1,905,216  Dtspkg.dll       
   08-Jun-2004  17:14  2000.80.949.0     528,960  Dtspump.dll      
   08-Jun-2004  17:14  2000.80.949.0   1,557,052  Dtsui.dll        
   08-Jun-2004  17:14  2000.80.949.0     639,552  Dtswiz.dll       
   10-Oct-2003  18:48                    747,927  Instdist.sql
   10-Oct-2003  18:48                      1,581  Inst_repl_hotfix.sql
   08-Jun-2004  17:14  2000.80.949.0     352,828  Isqlw.exe        
   08-Jun-2004  17:14  2000.80.949.0      82,492  Itwiz.exe        
   08-Jun-2004  17:14  2000.80.949.0      90,692  Msgprox.dll      
   19-May-2004  23:43  8.11.40209.0      209,408  Mssdi98.dll      
   08-Jun-2004  17:14  2000.80.949.0      62,024  Odsole70.dll     
   08-Jun-2004  17:15  2000.80.949.0      25,144  Opends60.dll     
   08-Jun-2004  17:16                     82,944  Opends60.pdb
   08-Jun-2004  17:14  2000.80.949.0      57,904  Osql.exe         
   08-Jun-2004  17:14  2000.80.949.0     279,104  Pfutil80.dll     
   10-Oct-2003  18:37                    550,780  Procsyst.sql
   08-Apr-2004  21:42                     12,305  Qfe469315.sql
   08-Apr-2004  21:42                     19,195  Qfe469571.sql
   08-Jun-2004  15:52                  1,104,848  Replmerg.sql
   08-Jun-2004  17:14  2000.80.949.0     221,768  Replprov.dll     
   08-Jun-2004  17:14  2000.80.949.0     307,784  Replrec.dll      
   08-Jun-2004  16:12  2000.80.949.0     159,813  Replres.rll
   10-Oct-2003  18:48                  1,087,150  Replsys.sql
   10-Oct-2003  18:48                    986,603  Repltran.sql
   08-Jun-2004  17:14  2000.80.949.0     287,304  Rinitcom.dll     
   08-Jun-2004  17:14  2000.80.949.0      78,416  Sdiclnt.dll      
   08-Jun-2004  17:14  2000.80.949.0      66,112  Semmap.dll       
   08-Jun-2004  17:14  2000.80.949.0      57,916  Semnt.dll        
   08-Jun-2004  17:14  2000.80.949.0     492,096  Semobj.dll       
   08-Jun-2004  16:37  2000.80.949.0     172,032  Semobj.rll
   08-Jun-2004  17:14  2000.80.949.0      53,832  Snapshot.exe     
   12-Mar-2004  03:10                    117,834  Sp3_serv_uni.sql
   08-Jun-2004  17:13  2000.80.949.0      28,672  Sqlagent.dll     
   08-Jun-2004  17:14  2000.80.949.0     311,872  Sqlagent.exe     
   08-Jun-2004  17:13  2000.80.949.0     168,001  Sqlakw32.dll     
   08-Jun-2004  17:15  2000.80.949.0      33,344  Sqlctr80.dll     
   08-Jun-2004  17:15  2000.80.949.0   4,215,360  Sqldmo.dll       
   08-Jun-2004  17:14                     25,172  Sqldumper.exe    
   08-Jun-2004  15:49  2000.80.949.0      28,672  Sqlevn70.rll
   08-Jun-2004  17:15  2000.80.949.0     180,792  Sqlmap70.dll     
   08-Jun-2004  17:15  2000.80.949.0     188,992  Sqlmmc.dll       
   08-Jun-2004  16:41  2000.80.949.0     479,232  Sqlmmc.rll
   08-Jun-2004  17:15  2000.80.949.0     401,984  Sqlqry.dll       
   08-Jun-2004  17:15  2000.80.949.0      57,920  Sqlrepss.dll     
   08-Jun-2004  17:15  2000.80.949.0   7,581,777  Sqlservr.exe     
   08-Jun-2004  17:15                 13,050,880  Sqlservr.pdb
   08-Jun-2004  17:15  2000.80.949.0     590,396  Sqlsort.dll      
   08-Jun-2004  17:15  2000.80.949.0      45,644  Sqlvdi.dll       
   08-Jun-2004  17:15  2000.80.949.0     106,588  Sqsrvres.dll     
   08-Jun-2004  17:15  2000.80.949.0      33,340  Ssmslpcn.dll     
   08-Jun-2004  17:15  2000.80.949.0      82,492  Ssnetlib.dll     
   08-Jun-2004  17:15  2000.80.949.0      25,148  Ssnmpn70.dll     
   08-Jun-2004  17:15  2000.80.949.0     123,456  Stardds.dll      
   08-Jun-2004  17:15  2000.80.949.0     158,240  Svrnetcn.dll     
   08-Jun-2004  17:14  2000.80.949.0      76,416  Svrnetcn.exe     
   08-Jun-2004  17:15  2000.80.949.0      49,228  Ums.dll          
   08-Jun-2004  17:15                    132,096  Ums.pdb
   08-Jun-2004  17:15  2000.80.949.0      98,872  Xpweb70.dll                                         

WORKAROUND

To work around this problem, use one of the following methods:

Method 1

Switch to another cursor type instead of the dynamic-cursor type.

Method 2

Do not update any one of the key columns of the non-clustered index.

Method 3

Use DBCC DBREINDEX. DBCC DBREINDEX sets the correct value for the null-block column.

Method 4

Determine the dynamic cursor position with an order-by clause. Now, only the key columns of the index are compared instead of the whole index row.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.

REFERENCES

For additional information, visit the following Microsoft Developer Network (MSDN) Web sites:

Using non-clustered indexes
http://msdn2.microsoft.com/en-us/library/aa933130(SQL.80).aspx
Dynamic cursors
http://msdn2.microsoft.com/en-us/library/ms805138.aspx
For more information, 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: 843267 - Last Review: November 5, 2007 - Revision: 2.5
APPLIES TO
  • 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
Keywords: 
kbfix kbbug kbcursor kbhotfixserver kbqfe KB843267

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