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‘Algorithms for Recovery and Isolation Exploiting Semantics’, or ARIES is a recovery algorithm designed to work with a no-force, steal database approach; it is used by IBM DB2, Microsoft SQL Server and many other database systems. Three main principles lie behind ARIES: – Write ahead logging: Any change to an object is first recorded in [...] The main goal of recovery is to ensure the atomicity property of a transaction. If a transaction fails before completing its execution, the recovery mechanism has to make sure that the transaction has no lasting effects on the database. The different approaches to recovery : – Deferred Update : These techniques postpone any actual updating [...] |
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