The answer is to use Amazon Kinesis Data Firehose to buffer the small JSON files into larger, optimized batches in S3, then load those with a scheduled COPY command. This approach solves the core inefficiency of the original design: calling the COPY command for each individual 1-10 KB file creates excessive API calls, leading to throttling and high latency. By buffering the files in Firehose, you aggregate them into multi-megabyte objects that align with Redshift’s strength in bulk, columnar ingestion, dramatically reducing the number of COPY operations and improving throughput. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of Redshift’s batch-oriented architecture and the cost implications of event-driven micro-batching versus streaming or single-file processing. A common trap is choosing a Lambda-per-file approach (Option A) because it seems simple, but it ignores Redshift’s per-query overhead and S3 event scaling limits. Memory tip: think “Firehose fills the bucket, then COPY takes the plunge”—batch first, load second.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 pipeline that ingests millions of small JSON files (1-10 KB each) from an S3 bucket into Amazon Redshift. The current approach uses a Lambda function triggered by S3 events to call the Redshift COPY command for each file. This is causing high latency and throttling. Which alternative is MOST cost-effective and efficient?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon Kinesis Data Firehose to buffer and write larger files to S3, then use a scheduled COPY command
Option D is correct because Kinesis Firehose can buffer the small files and write larger batches to S3, then use a scheduled COPY or Redshift Spectrum. Option A still processes each file individually. Option B is for streaming, not batch. Option C adds complexity and cost.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 Amazon Kinesis Data Streams and a consumer to batch files before COPY
Why it's wrong here
Kinesis Data Streams is for real-time, not optimal for small file aggregation.
✓
Use Amazon Kinesis Data Firehose to buffer and write larger files to S3, then use a scheduled COPY command
Why this is correct
Firehose buffers small files into larger ones, reducing COPY frequency and cost.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the Lambda concurrency limit and memory
Why it's wrong here
This increases cost and may still throttle.
✗
Use AWS Glue to merge files into larger Parquet files before loading
Why it's wrong here
Glue adds overhead and cost; merging can be done more simply.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Operations and Support — This question tests Data Operations and Support — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use Amazon Kinesis Data Firehose to buffer and write larger files to S3, then use a scheduled COPY command — Option D is correct because Kinesis Firehose can buffer the small files and write larger batches to S3, then use a scheduled COPY or Redshift Spectrum. Option A still processes each file individually. Option B is for streaming, not batch. Option C adds complexity and cost.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.