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FIX: Users Can Control the Compensating Change Process in Merge Replication
Article ID: 828637 - View products that this article applies to.
When you use merge replication, the Merge Agent may experience synchronization errors if an insert change, an update change, or a delete change cannot be applied at a destination replica for various reasons, including a primary key violation at the publisher or at the subscriber. The Merge Agent always sends a compensating change to the source replica to undo the failed change. The Merge Agent executes the compensating change process to make sure that data is maintained in a consistent and convergent state at all replicas. Without the compensating changes, data may vary between replicas if an error such as a primary key violation occurs. If the data varies across replicas, non-convergence of data occurs.
Before this hotfix, there was no way to permit users to control the compensating change process. The compensating change process was handled internally by the Merge Agent. Because this process was handled internally by the Merge Agent, it was difficult to troubleshoot why certain conflicts occurred. Also, because the conflicting row is deleted from or undone in all the replicas, the row data is removed from the whole topology. To help troubleshoot these issues, Microsoft has added a new article-level property to merge replication that permits users to control the compensating change process.
Service pack informationTo 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:
(http://support.microsoft.com/kb/290211/ )How to obtain the latest SQL Server 2000 service pack
Hotfix informationThe 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.
Note Because of file dependencies, the most recent hotfix or feature that contains these files may also contain additional files.
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 26-Aug-2003 20:16 2000.80.854.0 528,960 Dtspump.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 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 06-Sep-2003 01:36 1,090,932 Replmerg.sql 06-Sep-2003 07:18 2000.80.858.0 221,768 Replprov.dll 06-Sep-2003 07:18 2000.80.858.0 307,784 Replrec.dll 06-Sep-2003 00:00 1,087,150 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 03-Sep-2003 02:56 2000.80.857.0 188,992 Sqlmmc.dll 02-Sep-2003 23:03 2000.80.857.0 479,232 Sqlmmc.rll 08-Feb-2003 06:40 2000.80.765.0 57,920 Sqlrepss.dll 06-Sep-2003 07:19 2000.80.858.0 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
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.This problem was first corrected in Microsoft SQL Server 2000 Service Pack 4.
This hotfix adds a new article-level compensate_for_errors property for merge publications. You can set this property to true or false. The default value for this property is true. The default setting means that merge replication continues to issue compensating changes as it has in all previous releases and service packs. When this property is set to true and an insert change, an update change, or a delete change cannot be applied at a destination replica for various reasons (a primary key violation occurs at either the publisher or the subscriber, for example), the Merge Agent sends a compensating change to the source replica to undo the change.
When the compensate_for_errors property is set to false and a change cannot be applied at a destination replica, compensating actions are not issued and the failed change remains as a conflict until the database administrator resolves the error condition. The Merge Agent tries to replicate the row on each subsequent synchronization run until the error condition is resolved.
Downlevel subscription agents, particularly pull subscribers that do not have this hotfix installed, continue to behave as though the compensate_for_errors property is set to true, even if you have installed this hotfix on the publisher and the compensate_for_errors property is set to false on the publisher. Therefore, users should upgrade all subscribers to this hotfix if they want to use the functionality that is provided by the new compensate_for_errors property. This upgrade helps to ensure consistent behavior across the topology.
For Microsoft SQL Server 2000 Windows CE Edition subscribers, download conflicts behave the same as in all previous SQL Server releases, regardless of the compensate_for_errors property setting. However, the setting of the compensate_for_errors property determines whether compensating changes are generated during the upload of errors and conflicts from SQL Server CE subscribers to a SQL Server publisher (when both the publisher and the computer that is running Microsoft Internet Information Services (IIS) have been upgraded to this hotfix).
This property is exposed in both the sp_addmergearticle stored procedure and the sp_changemergearticle stored procedure as a new parameter named @compensate_for_errors. This property is not exposed in SQL Server Enterprise Manager. This property can be changed for existing articles without being reinitialized. The typical use of this property is:
Additions to the "sp_addmergearticle" Topic in SQL Server 2000 Books Online
The compensate_for_errors property controls whether the compensating actions are taken when errors are encountered during synchronization. The @compensate_for_errors parameter is defined as nvarchar(5) and has a default setting of true. By default, a change that cannot be applied at a subscriber or at a publisher during synchronization always leads to compensating actions to reverse the change. However, one incorrectly configured subscriber that generates an error can cause changes at other subscribers and publishers to be incorrectly reversed. Setting the compensate_for_errors property to false disables these compensating actions.
sp_addmergearticle [@compensate_for_errors = ] 'compensate_for_errors'
Note Setting the compensate_for_errors property to false may cause non-convergence.
Additions to the "sp_changemergearticle" Topic in SQL Server Books Online
sp_changemergearticle [ @publication = ] 'publication' , [ @article = ] 'article' [ , [ @property = ] 'property' ] [ , [ @value =] 'value' ]
Collapse this tableExpand this table
Note Setting the compensate_for_errors property to false may cause non-convergence.
The following select statement determines whether the compensate_for_errors property is set to true or false:
Because the compensate_for_errors property is a shared property for a particular article, its value should to be consistent if the article belongs to multiple publications (such as with republisher scenarios and alternative synchronization partners). This condition is enforced most of the time. However, it is the user's responsibility to make sure that the compensate_for_errors property has the same value for a particular article in all the publications that share the article. Again, this ensures consistent behavior across the topology.
Note If you have to restore a backup of a replicated database that was backed up before this hotfix was applied to the instance of SQL Server, run the sp_vupgrade_replication stored procedure with the required parameters against the instance of SQL Server to use the restored database in replication.
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the Standard Terminology That Is Used to Describe Microsoft Software Updates
Article ID: 828637 - Last Review: November 2, 2007 - Revision: 5.3