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Define rollback and roll forward ?
Rollback: Undoing the changes made by a transaction in terms:
1. Before transaction  commits. 
2. To cancel any changes to a database during current transaction.
3. Transaction not be consistent.

RollForward: Re-doing the changes made by a transaction in terms
1. After it commits 
2. To overwrite the changed value again to ensure consistency.
Posted By: Name:Rajesh Kr URL: Define rollback and roll forward ?