This method attempts to send the transactions from each origin to separate DSI executor threads. It assumes that multiple origins updating the same replicate have built-in contention control, so they can be safely applied in parallel to the replicate.
With Replication Server 12.6, the functionality of single_transaction_per_origin is
duplicated by selecting the wait_for_start serialization
method and the origin partitioning rule. single_transaction_per_origin has
been retained for backward compatibility. See “wait_for_start”.
