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Database recovery is the process of restoring the database to a correct (consistent) state in the event of a failure. In other words, it is the process of restoring the database to the most recent consistent state that existed shortly before the time of system failure.
There are two major techniques for recovery from non-catastrophic transaction failures: deferred updates and immediate updates. Immediate update – In the immediate update, the database may be updated by some operations of a transaction before the transaction reaches its commit point.
A major responsibility of the database administrator is to prepare for the possibility of hardware, software, network, process, or system failure. If such a failure affects the operation of a database system, you must usually recover the database and return to normal operation as quickly as possible.
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