Answer / srinu

Selects all rows.
Caches the existing target as a lookup table.
Compares logical key columns in the source against
corresponding columns in the target lookup table.
Compares source columns against corresponding target
columns if key columns match.
Flags new rows and changed rows.
Creates two data flows: one for new rows, one for changed
rows.
Generates a primary key for new rows.
Inserts new rows to the target.
Updates changed rows in the target, overwriting existing
rows.

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