- A
Use a Durable Functions orchestration
Durable Functions allow you to define an orchestrator that coordinates activities, provides retry, and handles failures atomically.
- B
Use a retry policy in the function code
Why wrong: A retry policy only retries the function invocation; it does not roll back or compensate database writes already performed.
- C
Enable function-level exception handling
Why wrong: Exception handling can catch errors but cannot ensure the entire process is reliably retried or compensated.
- D
Use an Azure Storage Queue for the function input
Why wrong: A queue input ensures the message is not lost, but if the function fails after writing to the database, the message may be requeued but the database side effect remains, leading to duplicate or inconsistent state.
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. 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.
You develop an Azure Function app that processes orders. The function must write order status updates to a database. You need to ensure that if the function fails after writing to the database, the order is not lost and can be retried. Which pattern should you implement?
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
Use a Durable Functions orchestration
Option A is correct because Durable Functions orchestrations provide built-in support for reliable execution and automatic retry on failure. By using an orchestration, you can write the order status to the database as an activity function, and if the function fails after the write, the orchestration can replay from the last checkpoint, ensuring the order is not lost and can be retried without duplicating the write.
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.
- ✓
Use a Durable Functions orchestration
Why this is correct
Durable Functions allow you to define an orchestrator that coordinates activities, provides retry, and handles failures atomically.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a retry policy in the function code
Why it's wrong here
A retry policy only retries the function invocation; it does not roll back or compensate database writes already performed.
- ✗
Enable function-level exception handling
Why it's wrong here
Exception handling can catch errors but cannot ensure the entire process is reliably retried or compensated.
- ✗
Use an Azure Storage Queue for the function input
Why it's wrong here
A queue input ensures the message is not lost, but if the function fails after writing to the database, the message may be requeued but the database side effect remains, leading to duplicate or inconsistent state.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a simple retry policy (Option B) with the durable checkpointing and replay mechanism, not realizing that a retry policy alone cannot prevent duplicate writes or recover from failures that occur after a side effect has been committed.
Detailed technical explanation
How to think about this question
Durable Functions uses the Event Sourcing pattern under the hood, where the orchestration history is stored in Azure Storage tables. When an activity function fails, the orchestrator can be replayed from the last completed step, allowing you to implement custom retry logic (e.g., with CallActivityWithRetryAsync) that respects idempotency. This is critical in scenarios like order processing where you must guarantee exactly-once or at-least-once semantics for database writes.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a Durable Functions orchestration — Option A is correct because Durable Functions orchestrations provide built-in support for reliable execution and automatic retry on failure. By using an orchestration, you can write the order status to the database as an activity function, and if the function fails after the write, the orchestration can replay from the last checkpoint, ensuring the order is not lost and can be retried without duplicating the write.
What should I do if I get this AZ-204 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.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft 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 AZ-204 exam.
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