Merge Replication - Examples For Custom Conflict Resolvers?
Oct 30, 2006
I have gone through BOL and various online resources including this one and I can't find any examples on how to use custom conflict resolvers to generate a result row which is a combination of the rows to be merged.
BOL says it can be done, but suitable examples are missing. I have found various posts requesting examples from up to a year ago, but can see no replies with relevant information
In particular I would like to see examples of
1) A stored procedure based custom conflict resolver
2) A business logic handler written in VB .Net
Here's hoping
aero1
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Nov 4, 2004
SQL2K SP4
Windows 2000 server
Merge Replication
How can I get sql server to log to the windows event long when a conflict occurs so that I can set up a notification alert. I have gone to the replication alerts in enterprise manager and set one up but it is never triggered and there is never anything in the windows event log.
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Nov 29, 2006
exec sp_helpmergeconflictrows @conflict_table = 'CMCustomer'
Msg 207, Level 16, State 1, Line 1
Invalid column name 'origin_datasource_id'.
When I run the "Microsoft Replication Conflict View" I am prompted to pick a table. Here are the details of the error message I receive.
===================================
CMCustomer is neither a DataColumn nor a DataRelation for table summary. (System.Data)
------------------------------
Program Location:
at System.Data.DataRowView.get_Item(String property)
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.GetWinnerSQL(DataRow loserRow, Boolean blockFetch)
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.GetSourceRow()
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.FillDetailData()
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.FillDetail()
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.summaryInfoGrid_SelectionChanged(Object sender, SelectionChangedEventArgs args)
at Microsoft.SqlServer.Management.UI.Grid.GridControl.OnSelectionChanged(BlockOfCellsCollection selectedCells)
at Microsoft.SqlServer.Management.UI.Grid.GridControl.SelectedCellsInternal(BlockOfCellsCollection col, Boolean bSet)
at Microsoft.SqlServer.Management.UI.Grid.GridControl.set_SelectedCells(BlockOfCellsCollection value)
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.ResetSummaryGrid()
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.LoadConflict()
When I try to "Remove" then conflict (Conflict type - "4(Update/Delete, Update wins)") I receive the following...
===================================
Column 'CMCustomer' does not belong to table summary. (System.Data)
------------------------------
Program Location:
at System.Data.DataRow.GetDataColumn(String columnName)
at System.Data.DataRow.get_Item(String columnName)
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.SetLogInfo(DataRow logRow, String sql)
at Microsoft.SqlServer.Management.UI.ConflictViewer.ViewerForm.btnClearUpper_Click(Object sender, EventArgs eg)
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Sep 3, 2007
Hi
I faced with strange problem.
From time to time, during syncronization I get the following errors at the subscriber:
ERROR: -2147200992
SOURCE: Merge Replication Provider
TEXT: The merge process could not store conflict information for article 'Products'. Check the publication properties to determine where conflicts records are stored. When troubleshooting, restart the synchronization with verbose history logging and specify an output file to which to write.
ERROR: 2812
SOURCE: OFF1SQLEXPRESS
TEXT: Could not find stored procedure 'MSmerge_cft_sp_49D28CEAFF8A4ACC5C5462B5027D4E4D'.
ERROR: -2147199481
SOURCE: Merge Replication Provider
TEXT: The Merge Agent was unable to update information about the last synchronization at the Subscriber. Ensure that the subscription exists at the Subscriber, and restart the Merge Agent.
After I refresh the snaphot at the publisher, these errors disappear and the syncronization is completed without any problem. And I can sync easy again week or two..
What is the problem?
What is the right solution?
Yep, I can continue to refresh the snapshot each time when the error appears, but..
maybe there is another approach?
Thanks in advance!
Paul
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Aug 4, 2015
I have been evaluating merge replication, 'push' subscription on SQL Server 2014. If the default resolver is used (I refer to @article_resolver parameter of sp_addmergearticle), all seems to work as expected. However if I use "Microsoft SQL Server Subscriber Always Wins Conflict Resolver" (or any other MS standard resolver for that matter), if the Subscriber is on a different machine, the merge agent invariably gives the following error: "The process could not initialize <resolver_name>. Verify that the component is registered correctly."
This does not happen if the Subscriber is on the same machine as the Publisher and Distributor.
The problem seemed to exist in SQL Server 2008 according to some posts but it has been apparently fixed since then. I've tried the following:
- @partition_options = 0, as was suggested somewhere.
- Copied ssrpub.dll (the resolver dll) to the Subscriber machine (should not really matter as this is 'push' subscription?)
- Registered ssrpub.dll with regsvr32 on the Publisher/Distributor machine.
I've also run sp_enumcustomresolvers on the Publisher machine, and it happily showed all standard resolver, including the "Microsoft SQL Server Subscriber Always Wins Conflict Resolver".
Another thought is, I'm using SQL Server Express as the Subscriber (on the remote machine). Perhaps it does not support custom resolvers? (I'm using the full SQL Server in the 'local subscriber' variant, which does work OK as I mentioned before).
Note also that if I create a new publication via SSMS, the Resolver tab of the Article Properties dialog is empty, i.e. it does not list any resolver. The same tab contains the full list of resolvers though, if opened for an existing publication.
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May 4, 2006
We have merge replication running with anamous subscribers
We have generested lots of views tables and stored procedures like
sp_ins_C435D35DDEC04FE2517CCD52A9024EC4
ctsv_07BA7383A12B4654B4D3A69B3053B227
aonflict_DH_tblReplicationRegion
How do we get rud of these I am concerned it will fill up the publisher database
Can any one advise
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Sep 7, 2006
Hi there!
I'm trying to create a custom resolver for merge replication exactly like in the MS example.
It seems to work, but only ONE time. If I change, insert or delete a
record in a table the second time, the subscriber monitor comes with
the following errors:
Error messages:
Attempted to read or write protected memory. This is often an
indication that other memory is corrupt. (Source: MSSQL_REPL, Error
number: MSSQL_REPL-2147199411)
The Merge Agent encountered an error when executing code in the
'UpdateHandler' method implemented in the business logic handler
'D:Program FilesMicrosoft SQL Server90COMMyResolver.dll'. Ensure
that the overridden 'UpdateHandler' method has been properly
implemented in the business logic handler. (Source: MSSQL_REPL,
Error number: MSSQL_REPL-2147199411)
This last error is of course dependant on my action (update, delete, insert).
My code is -exactly- like the example (I just stripped out the log message).
Does anyone know why I am "trying to read or write protected memory" ?
The thing is that I'm trying to create an application that detects if a
table changes. Is this the right way to do this anyway or are there
better solutions?
Any help is appreciated! Thanks!
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Feb 8, 2006
Hi,
Near the end of 2005 Microsoft made available some sample C# apps that implemented custom SSIS tasks and components. I think Doug Ladenshlager may have had a heavy hand in building them.
Does anyone know where they are? I can't darned well find them!
-Jamie
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Jan 26, 2006
Hi there,
I have created a custom conflict resolver for an article that is using Merge replication. I can register my custom resolver OK, I can change my merge article to use my new custom resolver, but when a conflict occures the replication monitor shows the following errors:
Error messages:
No signature was present in the subject.
(Source: MSSQL_REPL, Error number: MSSQL_REPL-2146762496)
Get help: http://help/MSSQL_REPL-2146762496
The Custom Resolver Component for article 'BRANCH' does not have a valid digital signature. (Source: MSSQL_REPL, Error number: MSSQL_REPL-2147198713)
Get help: http://help/MSSQL_REPL-2147198713
At first I thought it was because my assembly wasn't signed, so I signed it. I still get the same error.
I have various debug statements in the assembly and I can see that Initialize and HandleChangeStates gets called ok, but no other overrides.
Can anyone help me please?
Thanks
Graham
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Dec 5, 2006
Hi!
I'm trying to create a custom conflict resolver for SQL Server 2000 in
C# but i can't seem to find any source code examples of a *.dll where i
can actually see what needs to be done.
Any help is welcome.
Thanks
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Dec 21, 2006
Hi everyone,
I am working on a COM-based custom conflict resolver (vb.net) for a merge replication problem that I am having. This is what I am trying to accomplish. 1. Have a Last_Upd_Dt column. 2. When there is a conflict between publisher and subscriber on a column, the winner is the most recent date in Last_Upd_Dt and want the value for that column from that source. 3. If there is no conflict on a column and the column was updated by either the publisher or subscriber, I want to keep the change made by the publisher or the subscriber. (i.e publisher made change in col #1, subscriber made change in col #2, no conflict, the resulting row will now have the col #1 value from publisher, col # 2 will have value from subscriber. Essentially merging the changes.)
Does anyone have any examples of a COM-based Conflict Resolver that implements ICustomResolver for SQL Server 2005? Can this be done using the Business Logic Handler (examples?) ?
TIA
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Oct 22, 2006
Hi all,
I
am doing a work were i have to syncronize data between a Publiser
(PC, SQL SERVER 2005), and a subscriber (Pocket PC, SQL CE MOBILE). I
studied lots of articles and i managed to put the syncronization to
work, the problem is in conflict resolution!
The subscriber can΄t insert or delet, only update!!
For exmple: I have a table that contais the quantity of a product X,
for example 100 units, this goes to Pocket, but later arrive move 100
units that are increased in the PC, so we get 200 in the PC, (but 100
in Pocket), no problem if i syncronize now (Pocket will have 200 too),
but if remove in Pocket for example 50 units, i've changed the same
column in both Publisher and Subscriber database, if i syncronize now,
i'll have a conflict, the final result should be 150 of product X in
both databases (100 + 100 - 50), but the Publisher wins the conflict
and the final result is 200!
I never worked with stored procedures and in microsoft theres and article called How to: Implement a Stored Procedure-Based Custom Conflict Resolver for a Merge Article (Replication Transact-SQL Programming), but they dont explain it very well and i dont know how to do my own stored procedure and implement it to the merge article.
in my own stored procedure i'll have to do some calculations to get the
result i want, maybe using some table for the additions and
subtractions. (Does the com based Addition resolver do this for me???)
Maybe you have experienced some problem like this, and could help me!
How should i do the stored procedure?
Oh, i tried to use de addiction resolver and the average resolver
of com based but nothing happed, dont know why, i read some stuff and
i think the addition could solve my problem, but it doesn΄t work, i read above what you said and installed service
pack 1 for sql 2005, but i instaled and nothing
happened!
When i change to the resolver that the subscriver wins, it works, why addition dont work?
Thanx
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Oct 3, 2007
Hi,
I have 2-3 tables which contains are getting conflict error "Primary Key Violation" because the Same Primary Key is getting updated both at Publishing end and Subscribing end.
Can this be resolved any how without any manual intervention?
Regards,
Ruchir
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Oct 12, 2007
I am using SQL 2005 build 9.0.2227
I have a custom conflict resolver - which fires on update conflicts (using row level tracking)
I have had a couple of occasions when the resolver has failed with the following error:
"The schema of the custom Dataset object implemented in the business logic handler does not match the schema of the source Dataset object. Verify that the custom Dataset object has been correctly defined"
In both cases I found that the row for which a conflict was being handled was not a conflict at all. One was a straightforward non conflicting update at the publisher and the other was a similar update at the subscriber.
I got round the problem by temporarily using a fix version of the conflict resolver dll that either set the custom Dataset to the publisher dataset or the subscriber dataset - depending on where the update had occurred.
When the first error (publisher update) occurred - the resolver code was basing the custom dataset on the publisher dataset - which was presumably empty - so I changed the code to base the custom dataset on the subscriber dataset. The second error therefore occurred when the custom dataset was based on the subscriber dataset - which again was presumably empty
Note that the tables involved in each occasion were different and neither table is filtered.
Is there a known bug in this area?
I am considering trying to change the resolver code to identify false conflicts in order to workround the problem - but this would be difficult to test as I can't reproduce the problem
aero1
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May 17, 2007
I created a stored procedure based custom conflict resolver in SQL 2005, I return the winning result set and also save that result set to a test table to compare the values. The values saved to the test table are correct but some of the values saved as the conflict winter are truncated.
Example a char(3) filed is updated at the subscriber as 111 and updated at the publisher as 222, in my custom conflict resolver if I use the value from the subscriber the conflict resolver updates the field as 11 , if I use the publisher value the conflict resolver updates the field as 22 . Now the same records is saved to the test table correctly as either 111 or 222 depending on the logic I used. So the result set has the correct values, its after the custom conflict resolver is called where the values is somehow truncated. Has anybody run into this before and what steps can I take to avoid this.
Thank you,
Pauly C
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Jul 6, 2001
I have some rogue replication conflict tables that I can't delete because they are system tables. They are names aonflict_<tablename> and bonflict_<tablename>. They are definitely not needed anymore. How can I delete them ? Does anyone know how to delete a system table ?
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May 30, 2007
Hi all,
Is there a way to replicate all data in a table but on certain columns avoid throwing a conflict? I have serveral SQL servers running Tx-Rep and almost all of the tables contain a DateModified field. I don't really need to check for conflicts on this data but want to keep it in tact as much as possible.
Any Ideas?
Thanks in advance,
Michael
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Mar 20, 2008
Hello everybody,
we are running business critical application in 24*7 enviroment. Application is written in java and use JDBC 1.2 to read and write data into SQL 2005 SP2. We also use push transactional replication and as a part of this replication we run snapshot agent regulary.
Problem is that our java application receives regulary error: "Could not complete cursor operation because the table schema changed after the cursor was declared." After some further investigation with Profiler we found out, that snapshot agent calls sp_MSreplupdateschema with high probability this procedure changes at least modify_date of some tables included in replication. In profiler we also found that JDBC broadly uses cursors to access data. After the call sp_MSreplupdateschema all cursores declared before the call failed.
We tried to setup JDBC driver not to use cursors by setting SelectMethod=direct in configurations file. But this started deadlocks.
From my point of view it`s legitim to use cursors and snapshot agent together. The question is why snapshot agent modify table schema and how to solve this problem?
I send same question into Replication forum. Till now without any answer. I hope to have more luck there.
Thanks in advance for any advice
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Jun 12, 2007
hi all
let's say i have three publications running on a network of one central server and four shops.
- a merge replication that keeps the price-table up to date between all shops and the central server
- a transactional replication of the arrived_orders-table from the central server to the shop in case
- a transactional replication of the sold_products-table fromt he shops to the central server.
the whole replication network runs on a distribution database that is located on the central server.
now, i've noticed already a few times, when a conflict occurs in one of the replications, also all other replications stop working. (for example when the transactional replication can not insert a line in the sold_products table because of a violation against a UNIQUE constraint in the central server).
Is it normal that also the merge replication and the other transactional replication don't do their inserts, updates etc any more????
Thanks
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Jan 18, 2007
Hi Everyone!
Here another post on replication.
When conflict occur, I want the user to be able to select witch row to keep and witch to delete.
I've look for system stored procedure, that could help me do the resolution but I've founded nothing.
So I've thought that I could do it by hand, with UPDATE/DELETE query
Take the row in the %TABLE_NAME%_Conflict table and copy it into the real table, than delete the row.
I this the good way of doing it?
Is there any other way?
Thanks !
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Jun 28, 2006
I am using MSDE 2000 for my replication. the problem is that althought at time creating publication it inserts GUID into every table but if one table in 2 nodes has same primary key, it inserts only one row ( accorrding to prority ). there are some Conflict Reslover methods that can be used for this purpose. i wanted to ask that is there any other way for me to resolve this conflict. i am asking for a new way because my database schema has been created and a lot of coding behalf of that schema has been done.
I'd be thankful if you guide me.
Regards,
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Aug 29, 2006
Hi..
I have configured publisher, distributer,subscriber... and tried to replicate it... it has done successfully...
When i try to add datas to the publisher ... it says
"conflict error"
can you please tell me how to check the replication is successfull or not.
and i want to add datas to publisher so that it should frequently updated in subscriber...
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Dec 18, 2001
Hi all,
i think i have serious problem. i have almost 20,000 rows with the following conflict on a table (generated by merge replication over a period of around 3 weeks) :
'The row was updated at 'SubscriberServer3.DatabaseA' but could not be updated 'at 'PublicationServer1.DatabaseA'. Metadata mismatch'
i have 20 remote subscribers & 1 publisher. The above message originates from practically everywhere.
Besides dropping(not practical at the moment) & recreating replication to get rid of them, what else can i do to resolve this problem?? Do i have to resolve this problem row by row?? i'm at my wit's end. Please help!!
Thanx in advance.
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May 26, 2015
What is the main difference between snapshot and transactional and merge replication?
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Aug 30, 2007
Hi all,
I know that adding a column using ALTER TABLE to add a column automatically allows SQLSERVER 2005 to replicate the schema changes to the subscribers, however, I would like to add a new column to an existing article that is being used for merge replication, however, I don't want this column to be replicated. Re-initialising the subscriptions is not a option. Help would be appreciated.
I am using SQLSERVER 2005 (SP1).
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Oct 20, 2006
Very often we have 50'000+ rows which you need to pull values from different source (e.g. CityNames from citycode in Excel file). Currently we are using Lookup - but the questions is which of those 3 options is best in performance wise?
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Oct 9, 2007
I am working on bringing our disaster recovery site to be a live site. Currently we replicate to one of out servers (server B) with merge replication (from server A). Server A also does one way transactional replication form some table to several other servers including servers at the DR site.
This setup is not going to be fast enough for what we need so I am wondering if a table is receiving merge replication will the merge updates also replicate down the transaction path??
Example...
Server B update a row and merges to Server A. With this update them replicate (via transactional) to Server C??
thanks...
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Mar 8, 2007
Hi
Sorry for asking what may be a rookie question... We have configured transactional peer-to-peer replication in a testing environment with two servers, each publishing and subscribing to each other. If we write a piece of code that updates the same row on both servers with different values, we are not seeing data conflict issues. The data updated on server 1 propagates to server 2, but at the same time data updated on server 2 is updated on server 1. This leaves the records on each server out of data.
I expected my test case to produce errors, but instead I got inconsistent data. How do you turn on data consistency checking?
Thanks in advance
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Mar 20, 2006
SQL Server 2000 Enterprise
Hello,
I have a test publication of two tables. Both tables are supposed to use a custom update stored procedure
(you know, "Replace UPDATE commands with this stored procedure call:")
When updating Table1 the system calls my custom stored stored procedure.
Here is a small excerpt captured by the Profiler when updating Table1:
exec usp_FNLC_MSupd_Table1 'Jun 24 2005 12:00:00:000AM', NULL, 100081142, 0x01
Looks good. I see that my custom update proc was used (usp_FNLC_MSupd_Table1).
Now, when updating Table2 (Table2 is pretty identical to Table1) Profiler sends this back and the update on the subscriber fails:
exec sp_executesql N'delete from "Table2" where "Dates3ID" = @P1 insert into "Table2" values (@P2, @P3) ', N'@P1 int,@P2 int,@P3 datetime', 8, 8, 'Mar 24 2006 12:00:00:000AM'
Then..
exec sp_executesql N'insert into "Table1" values (@P1, @P2) ', N'@P1 int,@P2 datetime', 8, 'Mar 24 2006 12:00:00:000AM'
Go
This is what the distribution agent throws back:
Insert Error: Column name or number of supplied values does not match table definition.
(Source: DFBPBSO (Data source); Error number: 213)
So, why isn't the article Table2 using my custom update proc? All I do is updates, no deletes or inserts. No matter what I do for this article, it will not use the custom update proc.
I need help, please. Thank you in advance,
L
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Oct 20, 1998
Has anyone used custom stored procedures with multiple tables? or can you only use them with one.
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Feb 14, 2002
Hi everbody,
I setup the Merge Replication , it is working perfectly. But i have one problem now it is updating both ways. I nedd one way. Any body tell me which parameter i have to change.
Thanks in advance
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Aug 12, 2002
Hi,
My production box is running on NT4.0,SP6, SQL Server7.0,SP2. We implemented Merge replication. Working fine last 7 months. Last weekend i disabled replication, Successfully removed Distributor and Publishor. After that try add new fileds but won't allowed me. It's give the error message. I Also found Some Conflict_tables found almost 20 tables. All system Tables. Can delete these these tables, if i delete any problem my database.
I added filelds many times but this time i got errors.
Please help me anybody.
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