ITPEC FE Morning April 2023 Question 58

Fall back operation — disconnecting the failed components so the system keeps its more important functions running in a degraded mode.

Fall back (degraded or fail-soft operation) keeps a service partly available when some parts fail: the failed components are cut off and the system continues with reduced function or performance instead of stopping completely. Each of the other options describes a real procedure but gives it the wrong name.

Answer (a)

Why not others:

• •(b) — re-executing from data recorded at a checkpoint is a checkpoint restart; rebooting restarts the system from the beginning
• •(c) — recording changes so the database can be returned to its state before them is journaling: before images written to a log file and used for rollback
• •(d) — regularly copying files to other media is a backup; restoring is copying that backup back after a failure

Key rule: Keep the operations terms apart: backup saves, restore brings back, rollback undoes with before images, rollforward redoes with after images, and restart resumes from a checkpoint.

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