13.2. Database Recovery Concepts
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. The failure may be the result of a system crash due to hardware or software errors, a media failure such as head crash, or a software error in the application such as a logical error in the program that is accessing the database. Recovery restores a database form a given state, usually inconsistent, to a previously consistent state.
The number of recovery techniques that are used are based on the atomicity property of transactions. A transaction ...
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