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How to resolve primary Key changes with Sync Framework 2.1

Posted on 2011-09-15
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Hi,

I am synchronizing 2 databases in a one direction enviroment using Sync Framework 2.1. That means i have a "master" database and a "slave" db and i want the changes made in the master db to be downloaded to the slave db. I am only using 2 tables.
It works ok except one case. If i change the primary key in a row in the master db, this change is not reflected in the slave.

Does anybody have a clue or does anybody knows how to make the Sync FW works in those cases?

Thank you.
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Question by:mentor360
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by:Kevin Cross
ID: 36546666
Typically you do not change primary keys. I would expect to see instead the creation of a new row with updated key and deletion of old row. That will sync properly to remove the slave copy of the old row while adding the new one. I guess you can do this in a INSTEAD OF UPDATE trigger that processes as normal unless the following condition is true UPDATE(PK) then you would insert a new row into your database with the new PK and other values of row and delete the original row versus updating.

The issue with UPDATE is it will come over to the slave and try to match on the PK to do update. Since the PK is now changed, you won't make any connections.

Kevin
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by:mentor360
ID: 36546767
I have a restriction and i can't create triggers appart from the ones created by the sync framework provisioning. I thought maybe the sync framework could be configured to track the PK changes too.
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by:Kevin Cross
ID: 36546777
How would it match to the row to change the PK? If you have other columns that act as additional unique (natural) keys, then you may be able to JOIN on those update PK ...
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Author Comment

by:mentor360
ID: 36546860
I guess Sync Framework works different because it's able to detect and apply a DELETE. i just tested and manually deleting and inserting the row worked. But I would highly prefer the framework to work with the updates.
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by:Kevin Cross
ID: 36546873
The framework should work for updates, just not against the primary key. Sorry.
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mentor360 earned 0 total points
ID: 36713070
I ended up creating a field (IDENTITY) to be the PK and added a UNIQUE index on the old PK
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Author Closing Comment

by:mentor360
ID: 36898994
The was no solution I had to change my environment
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by:Kevin Cross
ID: 36713949
@mentor360: so to be clear for future readers - sync'ing primary key changes will not work, so your workaround is to make the column you needed to be able to change NOT a primary key. Anyway, glad you got this sorted.

Best regards and happy coding,

Kevin
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