DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is using AWS Lambda with an Amazon DynamoDB trigger. The Lambda function processes items from a DynamoDB Stream. The developer needs to ensure that the function processes each change exactly once and in order. Which TWO configurations should the developer use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set a reserved concurrency for the Lambda function to limit concurrent executions.
Option A is correct because a Lambda reservation ensures concurrency for the function. Option C is correct because specifying a batch size of 1 processes each record individually, ensuring order. Option B is wrong because DynamoDB Streams is already ordered by default; no need for FIFO. Option D is wrong because increasing concurrency is unnecessary. Option E is wrong because batch window is not needed.
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 FIFO queue as an event source instead of DynamoDB Streams.
Why it's wrong here
DynamoDB Streams already provides ordering.
✗
Increase the Lambda function's concurrency limit.
Why it's wrong here
May cause out-of-order processing.
✓
Set a reserved concurrency for the Lambda function to limit concurrent executions.
Why this is correct
Prevents too many parallel invocations.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set the batch size to 1 in the event source mapping.
Why this is correct
Ensures processing one item at a time in order.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable the batch window in the event source mapping.
Why it's wrong here
Not relevant for ordering.
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: Set a reserved concurrency for the Lambda function to limit concurrent executions. — Option A is correct because a Lambda reservation ensures concurrency for the function. Option C is correct because specifying a batch size of 1 processes each record individually, ensuring order. Option B is wrong because DynamoDB Streams is already ordered by default; no need for FIFO. Option D is wrong because increasing concurrency is unnecessary. Option E is wrong because batch window is not needed.
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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