DA0-002 Data Concepts and Environments Practice Question
An OLTP system processes thousands of transactions per second. Which property ensures that a transaction is fully completed or fully rolled back, preventing partial updates?
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 guarantees that a transaction is treated as a single unit, completed entirely or not at all.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Isolation
Why it's wrong here
Isolation governs concurrent transactions' visibility of each other's intermediate state, not atomicity. It is tempting because isolation levels are commonly tuned in OLTP tuning, and it would be the answer if the question asked how uncommitted reads between simultaneous transactions are prevented.
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Durability
Why it's wrong here
Durability guarantees committed transactions survive crashes, not that partial updates are rolled back. It is tempting because it is the other ACID property concerned with transaction completion, and it would be correct if the question asked whether committed data persists after a power failure.
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Atomicity
Why this is correct
Atomicity guarantees each transaction executes as a single indivisible unit, so either every operation commits or none does. This directly satisfies the stem's requirement to prevent partial updates under high-volume OLTP load, where a mid-transaction failure would otherwise leave inconsistent data committed.
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Consistency
Why it's wrong here
Consistency preserves valid database state and constraints before and after a transaction, but it does not guarantee all-or-nothing completion. Atomicity is the property ensuring a transaction fully commits or fully rolls back. Consistency would be correct when the requirement is enforcing integrity rules and valid state transitions.
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Written by Johnson Ajibi, MSc IT Security
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