The correct answer is to use the AWS SDK's S3 GetObject with a stream and process the file in chunks. This approach prevents Lambda out-of-memory errors when handling large file streaming from S3 because it processes data incrementally rather than loading the entire CSV into memory, which is the root cause of the failure. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of Lambda resource limits and efficient data handling patterns—a common trap is assuming that increasing memory or timeout will solve the problem, but those only mask the issue without addressing the memory footprint. Remember that Node.js streams are your best friend for large payloads: think "stream, don't scream" to avoid memory exhaustion.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 optimizing a Node.js Lambda function that processes CSV files from S3. The function reads the entire file into memory, processes it, and writes results to DynamoDB. For large files, the function runs out of memory. What is the MOST effective optimization?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the AWS SDK's S3 GetObject with a stream and process in chunks.
Option D is correct because streaming the file from S3 avoids loading the entire file into memory. Option A is wrong because increasing Lambda timeout does not address memory. Option B is wrong because increasing memory may help but is less efficient than streaming. Option C is wrong because S3 Select is for filtering, not streaming.
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 Lambda timeout to allow more processing time.
Why it's wrong here
Timeout does not solve memory exhaustion.
✗
Increase the Lambda function memory to 3008 MB.
Why it's wrong here
This could work but is not as efficient as streaming.
✓
Use the AWS SDK's S3 GetObject with a stream and process in chunks.
Why this is correct
Streaming prevents loading entire file into memory.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use S3 Select to retrieve only necessary columns.
Why it's wrong here
S3 Select reduces data, but still may require loading into memory.
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.
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: Use the AWS SDK's S3 GetObject with a stream and process in chunks. — Option D is correct because streaming the file from S3 avoids loading the entire file into memory. Option A is wrong because increasing Lambda timeout does not address memory. Option B is wrong because increasing memory may help but is less efficient than streaming. Option C is wrong because S3 Select is for filtering, not streaming.
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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Question Discussion
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