Fast recovery restores the database server to physical and logical consistency after any failure that results in the loss of the contents of memory for the database server. Such failures are usually caused by system failures. System failures do not damage the database but instead affect transactions that are in progress at the time of the failure.
Fast recovery addresses the following kinds of system failure:
How does the database server bring itself to a consistent state again? What happens to ongoing transactions? The answer to both questions is fast recovery.
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