Media Recovery (Contd)

To recover parts of DB from media failure
- failed parts if DB are fetched from archival dump
- only log records for failed part of DB are reapplied in a redo pass
- inprogress transactions that accessed the failed parts of the DB are rolled back
Same idea can be used to recover from page corruption
- e.g. Application program with direct access to buffer crashes before writing undo log record

To recover parts of DB from media failure