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Roll forward: The Rollforward redoes the changes made by a transaction, after the committed transaction and over-writes the changed value once again to ensure consistency.

Roll back: The Rollback transaction is a transaction which rolls back the transaction to the beginning of the transaction (Rollback Transaction_name). It is possible to use before Commit transaction. Source: http://www.mssqlfix.com/2012/07/difference-between-rollforward-and.html