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Datakey is not unique across all the tDataSeg partitions. Each table will begin at 1 and increment as each transaction is added. (I checked on an old V9 demo app i have) but would assume it has not changed in V11).this means that in the view the datakey values can be duplicated.
Also, the key to each table is only Datakey, not Datakey / Partitionkey, so if there are multiple locations on a particular tdataseg partiton, the datakey will just increment regardless of the partitionkey.
Thanks for you answer. So then we can conclude in Vdata the datakey and partition key combination would be the "unique key".