Quick Answer
The answer is atomicity, the database transaction property that enforces an all-or-nothing outcome. This is correct because atomicity treats a transaction as a single, indivisible unit of work: either every operation within it is committed successfully, or the entire transaction is rolled back, leaving the database completely unchanged. On the CompTIA ITF+ FC0-U61 exam, this concept tests your understanding of the ACID model, often appearing in scenario-based questions where a failure mid-transaction must not corrupt data. A common trap is confusing atomicity with consistency—remember, atomicity is about the transaction’s completeness, not data validity. For a quick memory tip, think of the word “atom” as something that cannot be split: a transaction either happens entirely or not at all.
This FC0-U61 practice question tests your understanding of it concepts and terminology. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A database administrator needs to ensure that a transaction either completes fully or not at all. Which property of database transactions is this?
Atomicity
Atomicity guarantees that a transaction is treated as a single unit, which either completes fully or not at all.
Isolation
Why wrong: Isolation ensures that concurrent transactions do not interfere with each other.
Consistency
Why wrong: Consistency ensures that a transaction leaves the database in a valid state.
Durability
Why wrong: Durability ensures that committed changes survive system failures.
Answer choices
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: either all of its operations are committed successfully, or none are applied. This is the 'all-or-nothing' property described in the ACID model. If any part of the transaction fails, the database management system (DBMS) rolls back the entire transaction, leaving the database unchanged.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Atomicity
Why this is correct
Atomicity guarantees that a transaction is treated as a single unit, which either completes fully or not at all.
Related concept
Read the scenario before looking for a memorised answer.
Isolation
Why it's wrong here
Isolation ensures that concurrent transactions do not interfere with each other.
Consistency
Why it's wrong here
Consistency ensures that a transaction leaves the database in a valid state.
Durability
Why it's wrong here
Durability ensures that committed changes survive system failures.
Common exam traps
The trap here is that candidates often confuse 'Atomicity' with 'Consistency' because both sound like 'completeness' or 'correctness,' but Atomicity strictly refers to the indivisible execution unit, not the validity of data.
Detailed technical explanation
Under the hood, atomicity is typically implemented via a write-ahead log (WAL) or undo log. If a transaction fails mid-way, the DBMS uses the log to revert any partial changes. In SQL, the COMMIT and ROLLBACK statements directly control atomicity; a ROLLBACK undoes all changes made since the last COMMIT or SAVEPOINT. Real-world scenarios like transferring funds between bank accounts rely on atomicity to prevent one account being debited without the other being credited.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the FC0-U61 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
IT Concepts and Terminology — This question tests IT Concepts and Terminology — Read the scenario before looking for a memorised answer..
The correct answer is: Atomicity — Atomicity ensures that a transaction is treated as a single, indivisible unit of work: either all of its operations are committed successfully, or none are applied. This is the 'all-or-nothing' property described in the ACID model. If any part of the transaction fails, the database management system (DBMS) rolls back the entire transaction, leaving the database unchanged.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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Variation 1. A database administrator needs to ensure that a transaction either fully completes or is fully rolled back. Which database property guarantees this?
mediumWhy C: Atomicity ensures that a transaction is treated as a single, indivisible unit of work: either all of its operations are committed successfully, or none are applied, and the database is rolled back to its previous state. This property directly guarantees the 'all or nothing' behavior required by the database administrator. In SQL databases, atomicity is typically enforced through transaction control statements like BEGIN TRANSACTION, COMMIT, and ROLLBACK, with the database engine managing undo logs to reverse partial changes if a failure occurs.
Last reviewed: Jun 11, 2026
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