ITPEC FE Morning October 2021 Question 58
ITPEC FE Morning October 2021 — Question 58 of 80
The question describes two steps: (1) restore a full backup from tape, (2) apply post-update log entries recorded after the backup. This is roll forward (redo recovery).
- •Roll forward replays committed transactions from the log on top of the restored backup, bringing the database up to the point of failure.
- •Rollback does the opposite — it undoes uncommitted transactions to restore consistency.
Why not others:
- (a) Checkpoint restart — resumes processing from an in-memory checkpoint, not from tape backup
- (b) Reboot — simply restarts the system without restoring data
- (d) Rollback — undoes incomplete transactions; does not replay committed changes from a log
Key rule: Roll forward = restore backup + replay log forward. Rollback = undo uncommitted changes backward.
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