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Database Recovery (DBMS Recovery (Logging Facilities - keep track of…
Database Recovery
storage
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Stable - represents data that has been replicated in several non-volatile storage media with independent failure modes
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DBMS Recovery
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Checkpoint Facility - which enables updates to DB that are in progress, to be made permanent
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Recovery Techniques
Immediate Update - Updates are applied to the Db as they occur, possibly even before the commit
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Write-Ahead Log Protocol - all updates are written to the log file before they are applied to stable storage. Re-do and Undo information is usually stored in the log file
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