The answer is Atomicity. This ACID property enforces the all-or-nothing behavior required in the banking scenario because it treats the debit and credit operations as a single, indivisible unit of work; if any step within that unit fails, the entire transaction is rolled back, leaving no partial changes in the database. On the Microsoft Azure Data Fundamentals DP-900 exam, this concept tests your understanding of transaction integrity in Azure SQL Database, often appearing in scenarios where you must identify which property prevents incomplete updates—a common trap is confusing Atomicity with Consistency, which instead ensures data rules are followed before and after the transaction. To remember, think of Atomicity as the “atom” of a transaction: it cannot be split, so it either happens completely or not at all.
DP-900 Practice Question: Identify considerations for relational data on Azure
This DP-900 practice question tests your understanding of identify considerations for relational data on azure. 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 banking application processes fund transfers. When a transfer is executed, the system must either successfully debit one account and credit the other, or if any step fails, the entire operation must be rolled back so no partial changes remain. Which ACID property directly enforces this behavior?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A) Atomicity
Atomicity ensures that a transaction is treated as a single, indivisible unit of work. In this banking scenario, the debit and credit operations are part of one transaction; if either step fails, the entire transaction is rolled back, leaving no partial changes. This is the core property that enforces the 'all-or-nothing' behavior described.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A) Atomicity
Why this is correct
Atomicity ensures the entire transaction is completed or fully rolled back, preventing partial updates.
Related concept
Read the scenario before looking for a memorised answer.
✗
B) Consistency
Why it's wrong here
Consistency ensures data integrity constraints are maintained, but it does not guarantee that multiple steps succeed or fail together.
✗
C) Isolation
Why it's wrong here
Isolation controls visibility of intermediate states to other transactions, not the all-or-nothing outcome.
✗
D) Durability
Why it's wrong here
Durability guarantees that committed changes survive failures, but it does not enforce the rollback of partial transactions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Consistency with Atomicity, thinking that 'keeping data consistent' means the same as 'all-or-nothing rollback,' but Consistency only enforces rules like constraints and triggers, not the indivisible execution of a multi-step operation.
Detailed technical explanation
How to think about this question
Under the hood, atomicity is typically implemented via a write-ahead log (WAL) or transaction log. In SQL Server, for example, the transaction log records every change before it is written to the data pages; if a transaction fails, the database engine uses the log to undo (roll back) all changes made by that transaction. A real-world scenario where this matters is a funds transfer between two accounts in different shards or databases—without atomicity, a crash after the debit but before the credit could result in lost money.
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.
TExam Day Tips
→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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A) Atomicity — Atomicity ensures that a transaction is treated as a single, indivisible unit of work. In this banking scenario, the debit and credit operations are part of one transaction; if either step fails, the entire transaction is rolled back, leaving no partial changes. This is the core property that enforces the 'all-or-nothing' behavior described.
What should I do if I get this DP-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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