The answer is that the consumer instances are not polling the SQS queue. When the ApproximateNumberOfMessagesVisible metric spikes, it directly indicates that messages are being sent to the queue but not retrieved or processed by any consumer. This is because SQS relies on active polling from consumers; without it, messages simply accumulate as visible, driving the metric upward. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of the SQS polling model versus processing failures—a common trap is confusing a rising visible count with a visibility timeout issue or a dead-letter queue trigger. Remember, a growing visible count means messages are never picked up, not that they are being processed and reappearing. Memory tip: "Visible spike = consumer not liking" — if messages are visible and piling up, the consumer isn't polling.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An application uses an Amazon SQS queue to decouple microservices. The producer is sending messages, but the consumer is not processing them. The consumer is an Auto Scaling group of EC2 instances. The SQS queue's ApproximateNumberOfMessagesVisible metric is increasing. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The SQS queue policy denies access to the consumer.
Why wrong: If access were denied, the consumer would receive errors, and the visible count would still increase, but the question asks for the most likely cause.
B
The consumer instances are not polling the SQS queue.
If consumers are not polling, messages accumulate in the queue.
C
The visibility timeout is set too low.
Why wrong: A low visibility timeout would cause messages to become visible again quickly, but it would not cause an increasing trend.
D
The SQS queue has a dead-letter queue configured.
Why wrong: A DLQ would not prevent messages from being processed; it would only receive messages that failed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The consumer instances are not polling the SQS queue.
Option A is correct because if the number of visible messages is increasing, the consumer is not polling or processing fast enough. Option B is wrong because the DLQ would receive messages after max receive count is exceeded, but the visible messages are increasing, indicating messages are not being consumed. Option C is wrong because the visibility timeout being too short would cause messages to reappear after being processed, but the visible count would not increase continuously. Option D is wrong because the queue is receiving messages, so permissions are likely correct.
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.
✗
The SQS queue policy denies access to the consumer.
Why it's wrong here
If access were denied, the consumer would receive errors, and the visible count would still increase, but the question asks for the most likely cause.
✓
The consumer instances are not polling the SQS queue.
Why this is correct
If consumers are not polling, messages accumulate in the queue.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The visibility timeout is set too low.
Why it's wrong here
A low visibility timeout would cause messages to become visible again quickly, but it would not cause an increasing trend.
✗
The SQS queue has a dead-letter queue configured.
Why it's wrong here
A DLQ would not prevent messages from being processed; it would only receive messages that failed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The consumer instances are not polling the SQS queue. — Option A is correct because if the number of visible messages is increasing, the consumer is not polling or processing fast enough. Option B is wrong because the DLQ would receive messages after max receive count is exceeded, but the visible messages are increasing, indicating messages are not being consumed. Option C is wrong because the visibility timeout being too short would cause messages to reappear after being processed, but the visible count would not increase continuously. Option D is wrong because the queue is receiving messages, so permissions are likely correct.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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