Handling Merge Replication Foreign Key Conflicts
Sep 20, 2007
I have SQL CE clients replicating against a SQL Server 2005 db using merge replication. The DB has a table A and a table B, which has a foreign key to table A. It is common in my application for records in table A to be deleted on the server. I'm running into issues when a table A record has been deleted, but table B records were created on the clients which point to that record. When I sync I get a conflict because the table B records cannot be applied at the server, and the table A delete cannot be applied at the client.
What I would like to happen is to have the table B records on the client be deleted by the merge process, and to create a log of the event. I've looked into creating a business logic handler to do this, but I'm not sure what type of conflict this is (UpdateDeleteConflict or otherwise), and I'm not sure that deleting the table B records is something I can do in the business logic handler.
This seems like it would be a common problem in merge replication. I'm not locked into using a custom business logic handler at all. Any suggestions are welcome.
Thanks.
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Aug 14, 2007
We use autogenerated primary keys in most of our tables. Some of these keys are also foreign keys in other tables. Right now there is only 1 database sever at a central location. But now there is a need to have multiple database servers at different locations. Data from these remote sites needs to be replicated to the central server. Some data would also distribute from central server to selected remote sites.
If I could resdesign, I would have choosen something like GUIDs for the primary keys or combination of something like ServerName and AutoGenerated number as a combined key. But that's not possible right now. How do I handle merge replication conflicts in this case?
I am looking for some pointers as to how to handle this case. If it were just simple table with 1 primary key, that would be easy as I can throw the primary key on remote server and let the central server create a new key when data is inserted. But in my case, a single table can be related to 5 or more other tables through these autogenerated keys. Any help is much appreciated.
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Mar 25, 2008
I have set up merge replication between 1 publisher and 9 subscribers (all push subscriptions). Distributor and publisher are located on the same machine.
Although everything seems to work fine from the outside (most of the time), there are a lot of conflicts in the conflict table for the replication. They appear all the time. There are a lot of "download insert failed" conflicts. They always look like in the following three screenshots:
http://www.tronk.be/conflicts/conflict1.JPG
http://www.tronk.be/conflicts/conflict2.JPG
http://www.tronk.be/conflicts/conflict3.JPG
In the same way, there are also many "upload insert failed" conflicts.
In addition to this, there are some "update conflict"s (but a lot less than the other conflicts). Some of them show the same row at both sides:
http://www.tronk.be/conflicts/conflict4.JPG
Others show a different row at the both sides:
http://www.tronk.be/conflicts/conflict5.JPG
The only thing that causes a real problem is the last screenshot, although I don't understand why the other conflicts are there (the inserst statements actually seem to happen anyway, even though there are conflicts). In case of the last screenshot, I can't find any place where an UPDATE actually happens at APP-STB, while I can clearly pinpoint the UPDATE at the other side (which is what actually comes from our program).
One more thing, the system is running on its limits, but all replication seems to be working fine.
I would appriacte any help or comments very much.
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Apr 18, 2007
Hi,
I am using SQL Server 2000 Merge Replication. Sometimes when the data is replicated there are conflicts which when examined show it is due to voliation of foreign key constraint. But the data (keys) in already present in the master tables. Is there a way to give an order to the way the tables are replicated. This is so because i think the data in the details table is relpicated first instead of the master table. The conflicts are resolved properly when done using the conflict viewer.
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Jul 31, 2007
Hello!
I got a problem with merge replication. I got a central sql server 2005 database on which i got a publication. Also there are 2 sql servers CE which are subscribers to that publication. I need to add some records on both mobile servers indepently but i'm using primary key as a user id in one table.
So when i add a user on one PDA i use next available number in column ID. In the same time I add a user on other PDA with the same ID, because I don't know that there is such user with the same ID.
Ok then I do synchronization. First PDA synchronizes with server but second tells me that there is a record with the same PK. And my question is. Can these be resolved writing a custom resolver or maybe you know others resolutions, because I think that is a typicall problem but couldn't find any solution other than using ie. HOST_NAME() function.
Thanks for help!
MZ
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Feb 13, 2015
There is an error in one of my merge publication. The error is,
The change for the row with article nickname 2336003 (test), rowguidcol {436456F0-F5AD-E411-80CF-5CF3FC1D2D76} could not be applied at the destination. Further information about the failure reason can be found in the conflict logging tables.
When i checked my tables I got following values in rowguid column
publication 436456F0-F5AD-E411-80CF-5CF3FC1D2D76
subscriptionD824D120-23AD-E411-80E3-00155D0E1001
conflict tables 689C6A61-5359-4BB5-BECD-B03F5F94D79A
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Jul 18, 2007
Hi all,
We are using a mix of SQL 2005 and 2000 servers and our "main" database server is running SQL 2005 x64 (SP2 ver. 3042).
Our system has run perfectly for months, then subsequent to an SP2 update we are seeing several instances where the data record counts are different for several tables among all the servers.
We are using Merge Replication, with no filters and published every 2 minutes.
Any ideas?
TIA,
Michael
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Aug 3, 2006
Publisher is 2005 x64, subscribers SS2000 (SP3) and SS2005 x64. Pull agents, no filters on subscriptions. We are seeing many seemingly random conflicts on between SS2000 subscriber and publisher. It happens on several different tables.
One table is never editted, only inserts happening everywhere and deletes happening on the SS2000 subscriber. Deletes will sometimes generate conflict. Reason is '"he row was deleted at 'CTS11.CTS' but could not be deleted at 'cts4a.cts'. Unable to synchronize the row because the row was updated by a different process outside of replication." CTS11 is SS2000 subscriber, CTS4A is publisher.
Probably unrelated bug but when looking at conflicts on this same table in SS2005 conflict viewer, get error "ID is neither a DataColumn nor a DataRelation for table summary (System.dATA)" and then "Column ID does not belong to table summary (System.Data)". ID column is rowguid, only unusual thing about table is that it has varchar(8000) field plus some other fields.
Other tables generate conflicts with this reason "The row was updated at 'CTS11.CTS' but could not be updated at 'cts4a.cts'. The merge process was unable to synchronize the row." I enabled verbose logging in the merge agent but the log file didn't contain any further explanation.
This same topology and schema worked fine when all publishers and subscribers were SS2000.
Any insight into how to fix this would be appreciated.
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Jun 9, 2006
We have SQL Server 2000 with merge replication at a Publisher and subscriber.
We have some records getting deleted at Publisher and Subscriber and no conflicts are logged.
We have tried the compensate_for_errors setting and this has had no effect.
This is causing serious data corruption and has now become an URGENT issue. Out tech team are almost out of ideas.
Has anyone experienced this or have any ideas as to what to check next?
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Jul 9, 2004
I am currently new to Merge Replication and have not been able to find one really simple underlying answer to the fundamentals of Merge Replciation....
Foreign Keys.... An example - I have two DBs in separate locations both adding new records. Assume that adding these new records create foreign key links to other tables. Of course when you come to synchronise - a foreign key in a table perhaps now relates to a different record.. How do you deal with this?
Eg: two DBs, the DBs both started out the same with 10 records in the CARS table for example. The two dbs also had 20 records in the MODEL table which states the model name and a foreign key relationship to the cars table. As the two DBs get updated separately and the result is now one DB has 2 new records in the car table for example and the other has 3 new records in its cars table... Of course these have corresponding entries in their MODEL table referencing primary keys. So how do I, using merge replication keep all these new records and update their foreign key references to suit as they synchronise?
It seems fundamental to merge replication and I cannot find advice anywhere on how to do this. Do I have to change both tables to use GUIDs as primary keys rather that incrementing numbers perhaps??
advice would be greatly appreciated
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Apr 10, 2007
i'm struggling with merge replication and foreign key constraints.
i have four tables:
- owners(id, name, firstname, address, phone)
- cars(id, licenceplate, ownerid) (thus with ownerid FK to the owners table)
- busses(id, licenceplate, ownerid) (thus with ownerid FK to the owners table)
- ships(id, licenceplate, ownerid) (thus with ownerid FK to the owners table)
now, i want to merge only the OWNERS table (article) between my 5 client pc's and 1 server.
I don't manage to reach this.
Using the merge replication upon all 4 tables works, but replicating only the owners table seems to be impossible.
Is it really impossible to replicate only the owners table, or do I forget something?
these are my create table scrips:
create table Owners (
id int identity,
name varchar(20),
firstname varchar(20),
address varchar(20),
phone varchar(20),
CONSTRAINT PK_owners
PRIMARY KEY(id)
);
create table cars (
id int identity,
licenceplate varchar(20),
ownerid int,
CONSTRAINT PK_cars
PRIMARY KEY(id),
CONSTRAINT FK_cars_ownerid
FOREIGN KEY(ownerid) REFERENCES owners(id) ON DELETE CASCADE
);
create table busses (
id int identity,
licenceplate varchar(20),
ownerid int,
CONSTRAINT PK_busses
PRIMARY KEY(id),
CONSTRAINT FK_busses_ownerid
FOREIGN KEY(ownerid) REFERENCES owners(id) ON DELETE CASCADE
);
create table ships (
id int identity,
licenceplate varchar(20),
ownerid int,
CONSTRAINT PK_ships
PRIMARY KEY(id),
CONSTRAINT FK_ships_ownerid
FOREIGN KEY(ownerid) REFERENCES owners(id) ON DELETE CASCADE
);
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Dec 24, 2006
Hi there. I'm somewhat new to merge replication, and I've been having an issue with one of the scenarios that I've been trying to get working. I am using SQL 2005 on the server, with 2005 express on the client. I have 2 tables:
Photo - which has a PhotoID primary key
PhotoData - which has a PhotoDataID primary key, and a PhotoID foreign key
both primary keys are int, and set to identity. I only want the Photo table to replicate for the merge, because I want the data in the PhotoData table to only be called by demand through a web service (since the images in that table are too large to be included in the normal replication). However, when a client adds a photo to his local database (which adds a record in the photo table, and then it's actual image data in the photodata table), I can't sync the photo table any longer. The error I get is:
Could not drop object 'dbo.Photo' because it is referenced by a FOREIGN KEY constraint
I have the foreign key relationship marked as "not for replication", but that doesn't seem to help. Is there another way I should be doing this? Thanks for any help!
-PHil
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Jun 30, 2007
Hello.
Let me describe first my replication setup:
- SQL Server 2005 SP1 (SP2 coming soon)
- Approximately 35 remote users (Salesrep laptop) using Pull Subscriptions
- Merge (Bi-Directional) (8 articles - tables only)
- Merge (Uni-Directional) (5 articles - tables only)
- Transactional (5 articles - tables only)
Users receive data based on their territory #, therefore they receive their customers sets of data. It happens that customer change from one territory to another but not frequently. When it happens, so far so good, the data is redirected to the new salesrep using the model we configured (Territory table with SUSER_NAME() to filter the data).
Ok, here's my problem. Since a while, I can see in the replication monitor that some users seems to log the same conflict again and again (Merge process). I mean, checking the history for many subscribers, there is always the same number in the "Conflict" colums.
As an example:
- Merge completed after processing 18 data change(s) (4 insert(s), 14 update(s), 0 delete(s), 31 conflict(s))
- Merge completed after processing 27 data change(s) (10 insert(s), 17 update(s), 0 delete(s), 31 conflict(s))
- Merge completed after processing 20 data change(s) (5 insert(s), 15 update(s), 0 delete(s), 31 conflict(s))
and so on...(Those are only 3 historical entries for a single subscriptions but there are many like that, always with the same count of conflict - vary per user). It appears to me that the same conflicts come over and over.
The thing is that if I decide to reinitialize a subscription, conflicts will disappear, therefore I know that it is not a process on the server that keeps changing the data; anyway, even if it was, changes would be applied on the subscription because the server always win in my setup.
Any idea what should I do with this? Any help would be greatly appreciated.
Thanks.
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Aug 15, 2007
Hi,
I was hoping a sharp eye may be able to pick up on what I am doing wrong here, I am i must be making a comon mistake. If necessary I am happy to create and post a sample if necessary.
Problem:
The publication parent table has a filter (defined below) and also has a join filter(defined below) to a child table. When changes are made to the parent and child table and synchronised a conflict is raised. For the child table for some reason the merge agent is saying an explicit update occured at the publisher but the values at the publisher have not changed at all and no sql has been executed to update the publisher rows. This in effect is stopping the changes to the child table being applied until i manually apply them in the conflict resolver. The strange thing is the conflict should not occur in the first place.
Perhaps my SQL server 2005 version? 9.00.2050.00 SP1 Standard Edition
Environment:
SQL Server 2005 - 9.00.2050.00 SP1 Standard Edition
SQL Server Mobile
Detail:
FKs are
FK: Job.JobScheduleID --> JobSchedule.ID
FK: JobDetail.JobID --> Job.ID
All three tables have int based IDs that are auto increment.
Publication Articles:
JobSchedule is download only
Job is Bidirectional, identity range management is MANUAL (only updates occur on this table)
JobDetail is Bidirectional, identity range management is MANUAL (only updates occur on this table)
Filters are of the following form:
Filter Job:
SELECT <published_columns> FROM [dbo].[Job] WHERE convert(nchar,[companyID])=Host_Name() AND [JobCompletedDate] IS NULL AND
( [JobScheduleID] in (SELECT distinct ID from JobSchedule where GETDATE() BETWEEN [JobSchedule].[start] AND [JobSchedule].[end]) )
Join Filter Job --> JobDetail
SELECT <published_columns> FROM [dbo].[Job] INNER JOIN [dbo].[JobDetail] ON [Job].[ID] = [JobDetail].[JobID]
Now the first thing to note with respect to using GetDate() i have read http://msdn2.microsoft.com/en-us/library/ms365153.aspx so i thought that i would remove that portion of the Filter on the Job table just to see what happens.
SELECT <published_columns> FROM [dbo].[Job] WHERE convert(nchar,[companyID])=Host_Name() AND [JobCompletedDate] IS NULL
This still did not resolve the issue. I then Remove the AND [JobCompletedDate] IS NULL and it then started working fine (cool) but of course no longer satisfys the rule i want to create (seriously uncool ).
Any ideas out there ?
Much appreciated,
pdns
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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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Jun 14, 2006
Can someone who has had direct experience with this tell me exactly what happens when a conflict (updating same record on two nodes at the same time) occurs in a P2P replication topology? Does the Dist. Agent throw an error? More importantly does the replication set continue to replicate the articles after any error occurs?
Thanks,
Derek
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Mar 6, 2004
Hi, I need to set an alert when a replication-conflict occurs rather that to check for conflicts manually. How can i accomplish this? I couldn't find the particular error-message to trap in an alert.
Regards!!
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Sep 23, 2015
We've got x2 data centers in the US:
NYC & SAC
Sadly the hostnames for the boxes I am trying to replicate are similar:
- db1.nyc.mydomain.tld
- db1.sac.mydomain.tld
The servers can talk to each other over all necessary ports however when I generate a push subscription from the publisher, I am asked to add the SQL Server subscriber and it already shows DB1 listed since itself is DB1.nyc. How can I attach the remote subscriber when setting up the subscription from the publisher if the hostname conflicts in my unique scenario?I created a entry on the publishers host file to use db2sac for the SAC IP and entering that alias in as the remote subscriber but no dice.
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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 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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Feb 7, 2007
When I use Management Studio (SQL Server 2005 SP 1) to set up transactional replication with updateable subscriptions, the snapshot initialization doesn't push the foreign key constraints. If I add a foreing key at the publisher, the change doesn't make it to the subscriber, even though the Publication Properties' Subscription Options panel shows Replicate Schema Changes set True - what am I missing?
Thanks, Liston
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Sep 23, 2015
I want to replicate the foreign keys to secondary.I changed the value Copy foreign key constraints value is to True.
I changed this value at pub properties - Articles -
And then it is asking for MARK for reinitialization with the new snapshot.I clicked ok.
When I checked sync status it has given the message like initial snapshot is not yet available.I started the snapshot and the subscription started replication records.When check at pup properties the value Copy foreign key constraints again false.
After changing the value to true it is showing as False.
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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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Jul 31, 2000
I have just installed replication on our production server to Merge Replicate with a Laptop server that will travel from time to time. I have now noticed that we cannot add or change any fields or attributes on the tables which are being replicated (which are all tables in the DB). This is a problem because we are changing and adding columns all of the time. Is there a way around this issue like shutting down the replication service or something? I have been unsuccessful in finding a way around this other than removing replication while we make changes.
Thank you in advance for any help!
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Jan 22, 2001
I have implemented a Merger replication on our development server and I get a fillowing error when I try to update one of the table in publisher.
"Transaction cannot start while in firehose mode"
What does this mean.
Thank You,
John
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Dec 19, 2000
Hi,
I read some where that replication has two types conflict resolution, 1. row based and 2. Column based...
If I am right...
Can any one point me how to find out this option and how to set it up....
Thanks,
Mohammed.
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Sep 16, 1999
Hi all,
I have a merge replication going between 4 servers. The problem is when ever I do some BCP transfer to one of the tables in one of the servers. It puts the data in that table. But that Data does not get replicated to any other server like it should.
Please Advice on what to do. Is there any option I am forgetting to set or something.
Thank you for all your time in advance.
Aziz
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Sep 12, 2003
I have successfully tried merge replication on single server with 2 databases.
now i want to do the same with different servers,
when i create pull subcription on server 2 which user account should I use?
it is giving log in failure
i tried using windows admin account and also the 'sa' account.
please help me out
thanks
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Feb 23, 2004
Hi All,
I have posted this earlier and I am re-posting it simplifying what I had said.
The scenario is:
I have two sql server database instances with the same database schema and all. However, both of them have different data. I have not set them for replication at all. Now, I want to do merge replication between them such that the data between them could be syncronized.
When I do pull merge subscription I have two choices -
1.Bringing schema and data to subscriber from publisher
2.Not bringing the schema and data from publisher to subscriber.
Obviously, I chose the second choice. But upon syncronizing I dont see any data from publisher coming to subscriber and vice-versa. If I add new data to publisher and do syncronization, I can see ONLY the new data created after the replication setup in subscriber. If I add new data to subscriber and do syncronization then the new data is removed from subscriber and not propagated to publisher.
Is there any way I can make this work??
Niben
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Jan 2, 2007
Hi,
I have just set up Merge replication, I have two servers, server A and server B, the merge replication worked successfully but I don't quite sure which databases should or should not replicated? If not, what other methods should I use?
I would really appreciated any comments or advice out there!
-whitebelt
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Mar 21, 2002
I had set up merge replication. I got these error messages where replications starts "Column names in each table must be unique. Column name 'PubID' in table 'bonflict_DBName_PHP_Data_Publications' is specified more than once "
PHP_Data_Publications table defind as:
CREATE TABLE [dbo].[PHP_Data_Publications] (
[PHP_Pub_ID] [uniqueidentifier] NOT NULL ,
[PHP_Data_ID] [uniqueidentifier] NOT NULL ,
[PubID] [uniqueidentifier] NOT NULL ,
[UserID] [uniqueidentifier] NOT NULL ,
[Username] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Publication] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[Pub_Year] [datetime] NULL ,
[Pub_Name] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[rowguid] uniqueidentifier ROWGUIDCOL NOT NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[PHP_Data_Publications] WITH NOCHECK ADD
CONSTRAINT [DF__PHP_Data___rowgu__01E91FA0] DEFAULT (newid()) FOR [rowguid]
GO
CREATE UNIQUE INDEX [index_1466488303] ON [dbo].[PHP_Data_Publications]([rowguid]) ON [PRIMARY]
GO
Thanks,
Chanthol
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