The answer is to set the BufferSizeInMBs to 1 MB and the BufferIntervalInSeconds to 60 seconds. These two configurations directly control how often Kinesis Data Firehose delivers data to S3, with the buffer interval acting as a maximum time limit and the buffer size as a volume threshold—whichever is hit first triggers the delivery. For near-real-time latency under one minute, you must set the interval to 60 seconds and the size low enough (1 MB) so that small batches of logs don’t wait for a larger buffer to fill. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding that Firehose’s buffer settings are the primary levers for latency, not transformations like Parquet conversion or compression, which affect storage and query performance but not delivery frequency. A common trap is assuming compression or format conversion speeds up delivery; in reality, they happen after the buffer flush. Memory tip: think “time or size, whichever comes first”—for low latency, keep both small.
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 data engineer is designing a data ingestion pipeline for real-time user activity logs. The logs are generated by a web application and must be ingested into Amazon S3 with minimal latency (under 1 minute). The logs also need to be queried in Amazon Athena. The engineer considers using Amazon Kinesis Data Firehose. Which TWO configurations are required to achieve near-real-time delivery to S3? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the BufferIntervalInSeconds to 60 seconds.
Options A and D are correct. Set 'BufferIntervalInSeconds' to 60 seconds to flush every minute, and 'BufferSizeInMBs' to 1 MB to ensure small files are delivered quickly. Option B is wrong because enabling S3 compression does not affect delivery frequency. Option C is wrong because converting to Parquet is a transformation, not a delivery trigger. Option E is wrong because enabling error logging does not reduce latency.
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.
✓
Set the BufferIntervalInSeconds to 60 seconds.
Why this is correct
Controls how often data is delivered.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable S3 compression (e.g., GZIP) on the delivery stream.
Why it's wrong here
Compression does not affect frequency.
✗
Enable Amazon CloudWatch error logging for the delivery stream.
Why it's wrong here
Logging does not reduce latency.
✗
Enable data format conversion to Parquet using AWS Glue.
Why it's wrong here
Conversion is a transformation, not delivery trigger.
✓
Set the BufferSizeInMBs to 1 MB.
Why this is correct
Small buffer size triggers early delivery.
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 Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the BufferIntervalInSeconds to 60 seconds. — Options A and D are correct. Set 'BufferIntervalInSeconds' to 60 seconds to flush every minute, and 'BufferSizeInMBs' to 1 MB to ensure small files are delivered quickly. Option B is wrong because enabling S3 compression does not affect delivery frequency. Option C is wrong because converting to Parquet is a transformation, not a delivery trigger. Option E is wrong because enabling error logging does not reduce latency.
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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This DEA-C01 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 DEA-C01 exam.
Question Discussion
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