Primary Key Violation at the time of Moving from primary range to secondary range.

Question

Hi Experts,
I've observed a strange issue in our environment.
we are using sql server 2008 R2 with SP2.
whenever a table is moving from primary range to secondary range on it's identity values, application is getting crashed with the message as below. 
Violation of PRIMARY KEY constraint 'PK6'. Cannot insert duplicate key in object 'dbo.TD_TRANN'. The duplicate key value is (17868679).
The statement has been terminated.
OR
Violation of UNIQUE KEY constraint 'IX_TDS_COST'. Cannot insert duplicate key in object 'dbo.TDS_COST'. The duplicate key value is (17, 19431201).
identity ranges were auto managed by replication. agents are running continuous.
please suggest.
Cheers, Vinod Mallolu

Answer 1

Well this is pretty simple, so there are two type of subscriptions (Server and client) in merge replication. So while adding article you provide following parameters:
@pub_identity_range
@identity_range
You can check the details of above parameters on following article:http://msdn.microsoft.com/en-us/library/ms174329.aspx
Snippet
 @pub_identity_range= ]
pub_identity_range              
Controls the identity range size allocated to a Subscriber with a server subscription when automatic identity range management is used. This identity range is reserved for a republishing Subscriber to allocate to its own Subscribers.
pub_identity_range is bigint, with a default of NULL. You must specify this parameter if
identityrangemanagementoption is auto or if
auto_identity_range is true.
[ @identity_range= ]
identity_range              
Controls the identity range size allocated both to the Publisher and to the Subscriber when automatic identity range management is used.
identity_range is bigint, with a default of NULL. You must specify this parameter if
identityrangemanagementoption is auto or if
auto_identity_range is true.
So for example you are adding "Server" type subscription then we consider @pub_identity_range value while assigning the range to that sub. If it is "Client" type subscription in that case we consider @identity_range value.
You could run following query to check the range assigned to each publisher and subscriber:
SELECT B.SUBSCRIBER_SERVER,B.DB_NAME,A.* FROM MSMERGE_IDENTITY_RANGE A,SYSMERGESUBSCRIPTIONS B
WHERE A.SUBID=B.SUBID
This should answer your other question as well.
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