Re: Key generation and history preserving logs

The log is correct. The History_Preserving transforms generates 2 rows for every updated input row, so it passes 80 rows: 40 inserts and 40 updates. Those 80 rows are fed into the Key_Generation. Obviously, keys are only generated for the inserts (the updated rows do have a key already ). Eventually 80 rows are written to the target table, again 40 updates, 40 inserts.