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Line 4: Three main principles lie behind ARIES * [[Write -ahead logging]]: Any change to an object is first recorded in the [[database log\|log]], and the log must be written to stable storage before changes to the object are written to disk. * [[Repeating history during Redo]]: On restart after a crash, ARIES retraces the actions of a database before the crash and brings the system back to the exact state that it was in before the crash. Then it undoes the transactions still active at crash time. * [[Logging changes during Undo]]: Changes made to the database while undoing transactions are logged to ensure such an action isn't repeated in the event of repeated restarts.

Algorithms for Recovery and Isolation Exploiting Semantics: Difference between revisions