ITPEC FE Morning October 2023 Question 56
ITPEC FE Morning October 2023 — Question 56 of 80
Big bang (all-at-once) migration switches from the old system to the new system at a single point in time, with no parallel operation.
Because there is no fallback to the old system, any problems during migration have a big impact.
Why not others:
- (a) Additional costs from parallel operations — describes parallel migration, where both systems run simultaneously
- (b) Additional application for connecting systems — describes a phased or bridge approach, not big bang
- (c) Old and new systems operate in parallel — this is the definition of parallel migration
Key rule: Big bang = instant cutover, no parallel run — high risk, high impact if something goes wrong.
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