Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
An e-commerce application processes customer orders. When an order is placed, the system must decrement the inventory count and process the payment. The application ensures that either both operations complete successfully or both are rolled back if any error occurs. Which database property does this guarantee?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Atomicity
Atomicity ensures that a transaction is an all-or-nothing operation. If any part of the transaction fails, the entire transaction is rolled back, preventing partial updates.
B
Distractor review
Consistency
Consistency ensures that a transaction brings the database from one valid state to another, maintaining data integrity rules. It does not directly guarantee the all-or-nothing execution of operations.
C
Distractor review
Isolation
Isolation ensures that concurrent transactions do not interfere with each other. It addresses visibility of intermediate transaction states, not the atomicity of operations within a single transaction.
D
Distractor review
Durability
Durability guarantees that once a transaction is committed, its changes persist even in the event of a system failure. It does not relate to the all-or-nothing execution of a transaction.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Related practice questions
Related DP-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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FAQ
Questions learners often ask
What does this DP-900 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Atomicity — Atomicity is one of the ACID properties in database transactions. It guarantees that a transaction is treated as a single, indivisible unit of work: either all operations within the transaction are completed and committed, or none are applied (rolled back). This prevents partial updates that could leave data in an inconsistent state. The scenario describes exactly that all-or-nothing behavior.
What should I do if I get this DP-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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