hardMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: A database transaction that updates two accounts…
A database transaction that updates two accounts fails halfway due to a power outage. Which ACID property ensures that partial changes are undone?
⚠ Common exam trap
CompTIA often tests the distinction between atomicity (rollback of a failed transaction) and durability (persistence of committed data), so candidates mistakenly choose durability because they associate 'failure' with 'data loss' rather than 'partial update rollback'.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Atomicity
Atomicity ensures that a transaction is treated as a single, indivisible unit of work. If a power outage interrupts the transaction after updating one account but before updating the second, the database management system (DBMS) must roll back any partial changes to restore the original state. This 'all-or-nothing' property prevents incomplete transactions from leaving the database in an inconsistent state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Durability
Why it's wrong here
Durability ensures committed changes persist, not rollback of uncommitted ones.
- ✗
Isolation
Why it's wrong here
Isolation prevents concurrent transactions from interfering, not rollback.
- ✗
Consistency
Why it's wrong here
Consistency ensures data validity, but rollback is handled by atomicity.
- ✓
Atomicity
Why this is correct
Atomicity ensures all or nothing; partial changes are rolled back.
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