Microsoft KB Archive/826860

= FIX: Linked Server Query May Return NULL If It Is Performed Through a Keyset Cursor =

Article ID: 826860

Article Last Modified on 11/2/2007

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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 Enterprise Edition
 * Microsoft SQL Server 2000 Workgroup Edition
 * Microsoft SQL Server 2000 Desktop Engine (Windows)
 * Microsoft SQL Server 2000 Developer Edition
 * Microsoft SQL Server 2000 Enterprise Edition 64-bit

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BUG #: 470007 (SQL Server 8.0)



SYMPTOMS
A linked server query may return NULL for columns in its result set if all the following conditions are true:
 * The query is performed through a keyset cursor.
 * An OUTER JOIN is performed on 2 or more remote tables.
 * A 4-part name is used for each remote table.
 * All the remote tables that are related to the OUTER JOIN have unique indexes.
 * No rows are returned from inner tables of the OUTER JOIN clause.

For example, assume that you have the following data: TableA col1 col2 1   1

TableB col1 col2 2   2 If you run the following query through a keyset cursor, this problem may occur: SELECT * FROM rmtsvr.ownr.dbname.tableA A LEFT OUTER JOIN rmtsvr.ownr.dbname.tableB B on A.col1=B.col1 and A.col2=B.col2



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 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 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 07-May-2003 18:47                    132,096   Opends60.pdb 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 11-Jul-2003 16:56                  1,085,925   Replsys.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 07-Aug-2003 19:11   2000.80.850.0  7,598,164   Sqlservr.exe 07-Aug-2003 19:11                 12,755,968   Sqlservr.pdb 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 30-Apr-2003 23:52                    132,096   Ums.pdb 02-Jul-2003 00:19   2000.80.834.0     98,816   Xpweb70.dll 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 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 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 01-Jun-2003 01:01   2000.80.818.0  4,215,360   Sqldmo.dll 07-Apr-2003 17:44                     25,172   Sqldumper.exe 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 Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.

Note This hotfix must be applied to a local server, not to a remote server.



WORKAROUND
To work around this problem, use one of the following methods:
 * Use a static cursor instead of a keyset cursor.
 * Use a pass-through query instead of a 4-part name query. To do so, you can use either of the following Transact-SQL functions:
 * OPENQUERY
 * OPENROWSET
 * Use an ad-hoc query instead of a cursor.
 * If you can, change unique indexes to non-unique indexes on the remote tables. This changes the cursor type to static.



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



MORE INFORMATION
For additional 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

Keywords: kbbug kbfix kbqfe kbsqlserv2000presp4fix kbhotfixserver KB826860

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