Abstract
Instant recovery improves system availability by reducing the mean time to repair, i.e., the interval during which a database is not available for queries and updates due to recovery activities. Variants of instant recovery pertain to system failures, media failures, node failures, and combinations of multiple failures. After a system failure, instant restart permits new transactions immediately after log analysis, before and concurrent to “redo” and “undo” recovery actions. After a media failure, instant restore permits new transactions immediately after allocation of a replacement device, before and concurrent to restoring backups and replaying the recovery log.
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