This DEA-C01 practice question tests your understanding of data store management. 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 media company stores video files in an S3 bucket. The files are processed by a fleet of EC2 instances that read the files, add watermarks, and write the output back to the same bucket. Recently, the processing jobs have been failing with '500 Internal Server Error' and '503 Slow Down' errors. The data engineer checks the S3 bucket metrics and sees that the PUT/GET request rate is consistently above 5,500 requests per second for a single prefix. The engineer needs to resolve the errors with minimal changes to the application code. Which course of action should the engineer take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the application to add a random hash prefix to the object keys to distribute load across multiple prefixes.
Option A is correct. Distributing objects across multiple prefixes (e.g., by adding a hash prefix) increases the request rate limit because S3 supports up to 5,500 requests per second per prefix. Option B is wrong because S3 Transfer Acceleration improves speed over distance but does not increase request rate limits. Option C is wrong because increasing EC2 instances would increase request rate, worsening the issue. Option D is wrong because S3 Batch Operations is for large-scale batch operations, not for real-time processing.
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 Batch Operations to process the files.
Why it's wrong here
Batch Operations is for large-scale batch jobs, not for real-time watermarking.
✗
Increase the number of EC2 instances to process files in parallel.
Why it's wrong here
More instances would increase request rate, likely worsening the 503 errors.
✗
Enable S3 Transfer Acceleration on the bucket to improve throughput.
Why it's wrong here
Transfer Acceleration improves latency over distance, not request rate limits.
✓
Modify the application to add a random hash prefix to the object keys to distribute load across multiple prefixes.
Why this is correct
Spreading requests across many prefixes increases the aggregate request rate limit.
Related concept
Read the scenario before looking for a memorised answer.
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 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 Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the application to add a random hash prefix to the object keys to distribute load across multiple prefixes. — Option A is correct. Distributing objects across multiple prefixes (e.g., by adding a hash prefix) increases the request rate limit because S3 supports up to 5,500 requests per second per prefix. Option B is wrong because S3 Transfer Acceleration improves speed over distance but does not increase request rate limits. Option C is wrong because increasing EC2 instances would increase request rate, worsening the issue. Option D is wrong because S3 Batch Operations is for large-scale batch operations, not for real-time processing.
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.
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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