The correct answer is that the Lambda function’s timeout is too short for the processing required. This is confirmed by the CloudWatch log showing a duration of 30001.23 ms, which is just over the default 30-second timeout, while memory usage sits at only 64 MB of the allocated 128 MB—proving memory pressure is not the culprit. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your ability to distinguish between timeout and memory-related failures when troubleshooting Lambda functions processing SQS messages; a common trap is to assume high memory consumption causes timeouts, but the log’s low memory usage points squarely to an insufficient timeout setting. Remember the memory tip: “Duration over default, memory under max—timeout, not memory, is the tax.”
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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.
Exhibit
Refer to the exhibit.
CloudWatch Logs Log Group: /aws/lambda/my-data-processor
Log Stream: 2025/01/15/[$LATEST]123456789abc
Log event:
2025-01-15T10:00:00.000Z 123456789abc ERROR Task timed out after 30.00 seconds
2025-01-15T10:00:00.000Z 123456789abc END RequestId: f1234567
2025-01-15T10:00:00.000Z 123456789abc REPORT RequestId: f1234567 Duration: 30001.23 ms Billed Duration: 30000 ms Memory Size: 128 MB Max Memory Used: 64 MB
A data engineer sees the CloudWatch log entry in the exhibit for a Lambda function that processes data from an Amazon SQS queue. What is the MOST likely cause of the timeout?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Lambda function's timeout is too short for the processing required.
Option B is correct because the log shows the function used only 64 MB of the allocated 128 MB memory, indicating that memory is not the issue. The function timed out after 30 seconds, and the duration is 30001.23 ms, which is just over the default timeout of 30 seconds. Therefore, increasing the timeout will resolve the issue. Option A is incorrect because memory usage is low. Option C is incorrect because the function is not hitting memory limits. Option D is incorrect because SQS visibility timeout does not affect Lambda execution timeout directly; the Lambda timeout is separate.
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.
✗
The Lambda function's reserved concurrency is set too low.
Why it's wrong here
Concurrency limits cause throttling, not timeouts.
✗
The Lambda function is running out of memory.
Why it's wrong here
Max Memory Used is 64 MB, well below the 128 MB limit.
✓
The Lambda function's timeout is too short for the processing required.
Why this is correct
The function timed out at exactly the 30-second limit.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The SQS queue's visibility timeout is set too low.
Why it's wrong here
Visibility timeout affects message re-delivery, not Lambda execution duration.
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 DEA-C01 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.
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Lambda function's timeout is too short for the processing required. — Option B is correct because the log shows the function used only 64 MB of the allocated 128 MB memory, indicating that memory is not the issue. The function timed out after 30 seconds, and the duration is 30001.23 ms, which is just over the default timeout of 30 seconds. Therefore, increasing the timeout will resolve the issue. Option A is incorrect because memory usage is low. Option C is incorrect because the function is not hitting memory limits. Option D is incorrect because SQS visibility timeout does not affect Lambda execution timeout directly; the Lambda timeout is separate.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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