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I configured Queued updatable subscriptions in transactional replication.
Publisher is on SQL Server Standard edition and Subscriber is on SQL Server Express edition, both on Windows XP.
The Queue Reader Agent uses this column during synchronization to determine if a conflict exists.
When you create a publication using queued updating, you select a conflict resolver to be used if any conflicts are detected.
In this case, another Subscriber or the Publisher updated the same row in the publication before this Subscriber transaction was synchronized.
Azure SQL Data Warehouse Parallel Data Warehouse Because queued updating subscriptions allow modifications to the same data at multiple locations, there may be conflicts when data is synchronized at the Publisher.
So of course when I go to the snapshot agent status, I see the error "Explicit value must be specified for identity column in table either when IDENTITY_INSERT is set to ON or when a replication user is inserting into a NOT FOR REPLICATION identity column." The first time this happened, I figured I had done something stupid, so I rolled back by selecting "Disable Publishing and Distribution", and did some digging.
Before I started enabling & setting up replication, all tables are columns had "not for replication" set to "false", which is what I would expect.
The following conflicts can occur: When creating a publication and enabling queued updating, replication adds a uniqueidentifier column (msrepl_tran_version) with the default of newid() to the underlying table.
When published data is changed at either the Publisher or the Subscriber, the row receives a new globally unique identifier (GUID) to indicate that a new row version exists.