- A
Make the payment operation idempotent by storing a unique request identifier before charging.
Idempotency ensures the same business request cannot create multiple charges if SQS redelivers the message.
- B
Reduce the visibility timeout so retries happen sooner after each timeout.
Why wrong: A shorter visibility timeout usually increases duplicate processing pressure and does not prevent repeated charges.
- C
Move the queue to Amazon SNS so each message is delivered only once.
Why wrong: SNS is a publish-subscribe service, not a durable work queue with exactly-once processing guarantees.
- D
Increase the message retention period so failed payments stay available longer.
Why wrong: Longer retention preserves messages, but it does not stop duplicates or isolate poison messages.
- E
Configure a dead-letter queue with a redrive policy for messages that exceed the max receive count.
A dead-letter queue stops poison messages from consuming worker capacity forever and preserves them for later inspection.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 payment worker consumes messages from an Amazon SQS queue. Sometimes the worker finishes the payment creation, but a timeout prevents message deletion and the same payment request is delivered again. Which two design changes best reduce the risk of duplicate charges and keep bad messages from looping forever? Select two.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Make the payment operation idempotent by storing a unique request identifier before charging.
Option A is correct because making the payment operation idempotent ensures that even if the same message is processed multiple times due to a timeout, the payment is only charged once. This is typically achieved by storing a unique request identifier (e.g., a UUID or idempotency key) in a database or cache before processing; subsequent duplicate requests with the same identifier are detected and ignored, preventing duplicate charges.
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.
- ✓
Make the payment operation idempotent by storing a unique request identifier before charging.
Why this is correct
Idempotency ensures the same business request cannot create multiple charges if SQS redelivers the message.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Reduce the visibility timeout so retries happen sooner after each timeout.
Why it's wrong here
A shorter visibility timeout usually increases duplicate processing pressure and does not prevent repeated charges.
- ✗
Move the queue to Amazon SNS so each message is delivered only once.
Why it's wrong here
SNS is a publish-subscribe service, not a durable work queue with exactly-once processing guarantees.
- ✗
Increase the message retention period so failed payments stay available longer.
Why it's wrong here
Longer retention preserves messages, but it does not stop duplicates or isolate poison messages.
- ✓
Configure a dead-letter queue with a redrive policy for messages that exceed the max receive count.
Why this is correct
A dead-letter queue stops poison messages from consuming worker capacity forever and preserves them for later inspection.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think reducing the visibility timeout or switching to SNS will solve duplicates, but they fail to recognize that SQS guarantees at-least-once delivery and that SNS does not provide message deduplication; the correct approach is to combine idempotency with a dead-letter queue to handle both duplicate charges and infinite retries.
Detailed technical explanation
How to think about this question
Under the hood, Amazon SQS provides at-least-once delivery, meaning duplicates are possible when a consumer fails to delete the message before the visibility timeout expires. Idempotency is a common pattern to handle this, often implemented using a distributed lock or a conditional write (e.g., INSERT ... ON CONFLICT DO NOTHING in PostgreSQL) keyed on a unique message deduplication ID. A dead-letter queue (DLQ) with a max receive count (e.g., 5) automatically moves messages that have been repeatedly processed but not deleted to the DLQ after the threshold is exceeded, preventing infinite looping and allowing manual inspection or remediation.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Make the payment operation idempotent by storing a unique request identifier before charging. — Option A is correct because making the payment operation idempotent ensures that even if the same message is processed multiple times due to a timeout, the payment is only charged once. This is typically achieved by storing a unique request identifier (e.g., a UUID or idempotency key) in a database or cache before processing; subsequent duplicate requests with the same identifier are detected and ignored, preventing duplicate charges.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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