DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company has a production application running on Amazon ECS with Fargate. The application consists of a front-end service and a backend service that processes orders. The backend service consumes messages from an Amazon SQS queue and writes order records to an Amazon DynamoDB table. Recently, during a marketing campaign, traffic increased significantly, causing the backend service to fall behind processing messages. The SQS queue depth grew to over 100,000 messages, and some orders were not processed in time, leading to customer complaints. The operations team noticed that the ECS service's CPU utilization never exceeded 60%, and memory utilization was around 50%. The service is configured with a desired count of 2 tasks and a target tracking scaling policy based on average CPU utilization. The DynamoDB table has on-demand capacity mode. After analyzing the logs, the development team found that each message processing takes about 2 seconds, but the backend service has a bottleneck: it makes an HTTP call to a third-party API that sometimes takes up to 10 seconds to respond. The team wants to optimize the architecture to handle traffic spikes better without over-provisioning resources.
Which solution is MOST effective?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Increase the batch size of messages polled from SQS to 20 to process more messages per task.
Why wrong: Larger batch may increase processing time and timeout risk.
B
Refactor the backend service to send the order processing request to a separate SQS queue and have a dedicated set of tasks poll that queue to make the HTTP call. This decouples the main processing from the slow API call.
Offloading the slow call improves throughput.
C
Increase the desired count of the ECS service to 10 tasks and set a target tracking scaling policy based on SQS queue depth.
Why wrong: More tasks may still be blocked by the slow API.
D
Change the scaling policy to use memory utilization instead of CPU, since CPU is underutilized.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Refactor the backend service to send the order processing request to a separate SQS queue and have a dedicated set of tasks poll that queue to make the HTTP call. This decouples the main processing from the slow API call.
Option A is correct because the bottleneck is the third-party API call. Moving the call to a separate step function or SQS queue allows the ECS service to offload that work and process more messages concurrently. Option B is wrong because increasing tasks may not help if the bottleneck is the API latency. Option C is wrong because changing scaling metric to memory is not addressing the root cause. Option D is wrong because increasing batch size may increase per-invocation time and exacerbate the bottleneck.
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.
✗
Increase the batch size of messages polled from SQS to 20 to process more messages per task.
Why it's wrong here
Larger batch may increase processing time and timeout risk.
✓
Refactor the backend service to send the order processing request to a separate SQS queue and have a dedicated set of tasks poll that queue to make the HTTP call. This decouples the main processing from the slow API call.
Why this is correct
Offloading the slow call improves throughput.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the desired count of the ECS service to 10 tasks and set a target tracking scaling policy based on SQS queue depth.
Why it's wrong here
More tasks may still be blocked by the slow API.
✗
Change the scaling policy to use memory utilization instead of CPU, since CPU is underutilized.
Why it's wrong here
Memory is not the bottleneck.
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 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 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: Refactor the backend service to send the order processing request to a separate SQS queue and have a dedicated set of tasks poll that queue to make the HTTP call. This decouples the main processing from the slow API call. — Option A is correct because the bottleneck is the third-party API call. Moving the call to a separate step function or SQS queue allows the ECS service to offload that work and process more messages concurrently. Option B is wrong because increasing tasks may not help if the bottleneck is the API latency. Option C is wrong because changing scaling metric to memory is not addressing the root cause. Option D is wrong because increasing batch size may increase per-invocation time and exacerbate the bottleneck.
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: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services 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 DVA-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.