Algorithms For Recovery And Isolation Exploiting Semantics

• Write ahead logging: Any change to an object is first recorded in the log, and the log must be written to stable storage before changes to the object is 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.

External References

• C. Mohan, Repeating History Beyond ARIES, Proceedings of 25th International Conference on Very Large Data Bases, 1999

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