- A
Enable DynamoDB Streams on the table and process records.
Why wrong: DynamoDB Streams are not related to S3 event processing.
- B
Increase the Lambda function's memory allocation.
Why wrong: Memory is not the issue since some objects are processed successfully.
- C
Check the S3 bucket notification configuration to ensure it is properly set for the correct events.
Misconfigured notifications can cause some events to not trigger the function.
- D
Configure a dead-letter queue on the Lambda function to capture unprocessed events.
A DLQ captures events that Lambda could not process, helping identify missed invocations.
- E
Review the Lambda function's CloudWatch Logs for timeout messages.
Why wrong: No errors in logs suggest the function is not invoked for missing objects.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 developer is troubleshooting an AWS Lambda function that is invoked by an Amazon S3 bucket notification. The function processes new objects and writes results to a DynamoDB table. Recently, some objects are not being processed. The developer checks the CloudWatch Logs for the Lambda function and sees no errors. Which TWO actions should the developer take to investigate the issue?
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
Check the S3 bucket notification configuration to ensure it is properly set for the correct events.
Options B and D are correct. Option B: S3 event notifications can fail if the event is not configured correctly; checking the bucket notification configuration ensures the events are being sent. Option D: Lambda dead-letter queues (DLQ) capture events that failed to be processed; if configured, they can reveal unprocessed events. Option A is wrong because the function logs show no errors, indicating the function is not invoked for those objects. Option C is wrong because DynamoDB stream is not involved in this flow. Option E is wrong because the function is invoked, but the issue is before invocation.
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.
- ✗
Enable DynamoDB Streams on the table and process records.
Why it's wrong here
DynamoDB Streams are not related to S3 event processing.
- ✗
Increase the Lambda function's memory allocation.
Why it's wrong here
Memory is not the issue since some objects are processed successfully.
- ✓
Check the S3 bucket notification configuration to ensure it is properly set for the correct events.
Why this is correct
Misconfigured notifications can cause some events to not trigger the function.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure a dead-letter queue on the Lambda function to capture unprocessed events.
Why this is correct
A DLQ captures events that Lambda could not process, helping identify missed invocations.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Review the Lambda function's CloudWatch Logs for timeout messages.
Why it's wrong here
No errors in logs suggest the function is not invoked for missing objects.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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Troubleshooting and Optimization — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: Check the S3 bucket notification configuration to ensure it is properly set for the correct events. — Options B and D are correct. Option B: S3 event notifications can fail if the event is not configured correctly; checking the bucket notification configuration ensures the events are being sent. Option D: Lambda dead-letter queues (DLQ) capture events that failed to be processed; if configured, they can reveal unprocessed events. Option A is wrong because the function logs show no errors, indicating the function is not invoked for those objects. Option C is wrong because DynamoDB stream is not involved in this flow. Option E is wrong because the function is invoked, but the issue is before invocation.
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.
About these practice questions
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Last reviewed: Jun 20, 2026
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.
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