DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 company uses AWS Lambda to process incoming messages from an Amazon SQS queue. The Lambda function sometimes fails with a timeout error when the queue has a large backlog. What is the MOST efficient way to increase throughput without causing duplicate processing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the batch size in the event source mapping.
Option D is correct because increasing the batch size allows the function to retrieve more messages per invocation, improving throughput. Option A is wrong because increasing reserved concurrency alone may not help if the function is throttled due to concurrency limits; also, without adjusting batch size, each invocation still processes the same number of messages. Option B is wrong because decreasing the batch size reduces throughput. Option C is wrong because increasing visibility timeout may help with retries but does not directly increase throughput.
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 in the event source mapping.
Why this is correct
Increasing batch size allows more messages per invocation, directly improving throughput.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the visibility timeout of the SQS queue.
Why it's wrong here
Increasing visibility timeout helps prevent duplicate processing but does not increase throughput.
✗
Decrease the batch size in the event source mapping.
Why it's wrong here
Decreasing batch size reduces the number of messages per invocation, decreasing throughput.
✗
Increase the reserved concurrency of the Lambda function.
Why it's wrong here
Increasing reserved concurrency does not increase the number of messages processed per invocation.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the batch size in the event source mapping. — Option D is correct because increasing the batch size allows the function to retrieve more messages per invocation, improving throughput. Option A is wrong because increasing reserved concurrency alone may not help if the function is throttled due to concurrency limits; also, without adjusting batch size, each invocation still processes the same number of messages. Option B is wrong because decreasing the batch size reduces throughput. Option C is wrong because increasing visibility timeout may help with retries but does not directly increase throughput.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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
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