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Durability (database systems)
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Durability (database systems) : ウィキペディア英語版
Durability (database systems)

In database systems, durability is the ACID property which guarantees that transactions that have committed will survive permanently.
For example, if a flight booking reports that a seat has successfully been booked, then the seat will remain booked even if the system crashes.
Durability can be achieved by flushing the transaction's log records to non-volatile storage before acknowledging commitment.
In distributed transactions, all participating servers must coordinate before commit can be acknowledged. This is usually done by a two-phase commit protocol.
Many DBMSs implement durability by writing transactions into a transaction log that can be reprocessed to recreate the system state right before any later failure. A transaction is deemed committed only after it is entered in the log.
==See also==

* Atomicity
* Consistency
* Isolation
* Relational database management system


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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