Durability (database systems)

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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.

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