mediumMultiple ChoiceObjective-mapped
FC0-U71 Practice Question: A banking transaction transfers money from…
A banking transaction transfers money from savings to checking. The system updates the savings balance, then the power fails before the checking balance is updated. Which ACID property is violated?
⚠ Common exam trap
Candidates often confuse atomicity with consistency, thinking a partial update violates consistency first, but the core issue is that the transaction did not complete as an atomic unit, which is the direct violation of atomicity.
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. In this scenario, the transfer operation consists of two steps: deducting from savings and crediting to checking. Because the power failure occurs after the savings balance is updated but before the checking balance is updated, the transaction is left partially completed, violating atomicity. The system must either complete both steps or roll back the first step to maintain atomicity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Atomicity
Why this is correct
Atomicity requires all or nothing; partial update violates it.
- ✗
Isolation
Why it's wrong here
Isolation deals with concurrent transactions.
- ✗
Durability
Why it's wrong here
Durability concerns committed data surviving failures.
- ✗
Consistency
Why it's wrong here
Consistency ensures data validity, but the partial update is an atomicity failure.
Go deeper
Related to this question
About these practice questions
One of 988 original FC0-U71 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.