The correct answer is to use S3 Select to filter and retrieve only necessary data, reducing file size. This resolves the Lambda timeout for large S3 files because S3 Select allows you to run SQL-like queries directly on objects stored in S3, returning only the subset of data you need instead of downloading the entire file to /tmp. By drastically reducing the payload, the Lambda function can process within the 15-minute maximum execution time without altering the existing event-driven architecture. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of Lambda’s hard timeout limit and S3’s server-side filtering capabilities—a common trap is assuming you can extend the timeout by increasing memory or switching runtimes, but neither changes the 15-minute ceiling. Memory tip: “Select, don’t collect”—S3 Select lets you query in place, so your Lambda only sees the relevant rows, not the whole file.
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 for processing events from Amazon S3. Recently, the Lambda function started timing out after the 15-minute limit for some large files. The function downloads the entire file to /tmp before processing. What should a DevOps engineer do to resolve this issue with minimal code changes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use S3 Select to filter and retrieve only necessary data, reducing file size
Splitting the file into smaller parts using S3 Select allows processing within the Lambda timeout without changing the overall architecture. Option A is wrong because increasing memory does not increase timeout beyond 15 minutes. Option C is wrong because reading the file in chunks from S3 still requires processing within the Lambda timeout. Option D is wrong because moving to a different runtime does not remove the timeout limit.
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 S3 Select to filter and retrieve only necessary data, reducing file size
Why this is correct
S3 Select allows retrieving only required columns, reducing data transfer and processing time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Switch the Lambda runtime from Python to Node.js for faster execution
Why it's wrong here
Runtime change does not affect the timeout limit.
✗
Increase the Lambda function memory to 10,240 MB to improve CPU performance
Why it's wrong here
Increasing memory does not extend the 15-minute timeout.
✗
Modify the function to read the file in streaming chunks from S3
Why it's wrong here
Streaming still must complete within the 15-minute timeout.
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 DOP-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.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use S3 Select to filter and retrieve only necessary data, reducing file size — Splitting the file into smaller parts using S3 Select allows processing within the Lambda timeout without changing the overall architecture. Option A is wrong because increasing memory does not increase timeout beyond 15 minutes. Option C is wrong because reading the file in chunks from S3 still requires processing within the Lambda timeout. Option D is wrong because moving to a different runtime does not remove the timeout limit.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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 DOP-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 DOP-C02 exam.
Question Discussion
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