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=== Durability failure === Consider a transaction that transfers 10 from A to B. First, it removes 10 from A, then it adds 10 to B. At this point, the user is told the transaction was a success. However, the changes are still queued in the [[disk buffer]] waiting to be committed to disk. Power fails and the changes are lost, but the user assumes (understandably) that the changes persist.
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