August 2009
Intermediate to advanced
893 pages
26h 48m
English
Content preview from Database Systems: Concepts, Design and Applications
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13.4. Types of Database Recovery
In case of any type of failures, a transaction must either be aborted or committed to maintain data integrity. Transaction log plays an important role for database recovery and bringing the database in a consistent state in the event of failure. Transactions represent the basic unit of recovery in a database system. The recovery manager guarantees the atomicity and durability properties of transactions in the event of failures. During recovery from failure, the recovery manager ensures that either all the effects of a given transaction are permanently recorded in the database or none of them are recorded. A transaction begins with successful execution of a <T, BEGIN>” (begin transaction) statement. It ends with ...