hardMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: A database administrator notices that a…
A database administrator notices that a transaction that updates two tables is failing halfway, leaving data inconsistent. Which property of ACID ensures that the database returns to its original state if the transaction fails?
⚠ Common exam trap
CompTIA often tests the distinction between Atomicity and Consistency, where candidates mistakenly think Consistency handles rollback, but Atomicity is the property that ensures the entire transaction is undone on failure.
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 (option D) ensures that a transaction is treated as a single, indivisible unit of work. If any part of the transaction fails (e.g., updating the second table), the entire transaction is rolled back, and the database returns to its original state before the transaction began. This prevents partial updates that would leave data inconsistent.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Consistency
Why it's wrong here
Consistency ensures that data is valid before and after a transaction, but the rollback is due to atomicity.
- ✗
Durability
Why it's wrong here
Durability ensures committed transactions persist, not rollback of uncommitted ones.
- ✗
Isolation
Why it's wrong here
Isolation ensures concurrent transactions do not affect each other, not rollback.
- ✓
Atomicity
Why this is correct
Atomicity guarantees that all parts of a transaction succeed or none do, allowing rollback on failure.
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