The answer is Amazon S3 with lifecycle policies and Amazon FSx for Lustre. S3 is ideal for storing large unstructured blobs up to 5 TB each because it offers virtually unlimited scalability, high throughput, and low-latency access, while lifecycle policies automatically transition objects to colder tiers like S3 Glacier Deep Archive after 30 days, perfectly matching the frequent-then-rare access pattern. FSx for Lustre provides the high-performance, low-latency file system needed for active processing of these massive blobs. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to pair a cost-effective, tiered object store with a high-speed parallel file system for transient workloads—a common scenario for data lakes and HPC. A frequent trap is choosing only one storage type; remember that the exam often requires two complementary services. Memory tip: “S3 for the long haul, Lustre for the sprint.”
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 evaluating storage options for a new application that requires low-latency access to unstructured blobs (up to 5 TB each) with high throughput. The data will be accessed frequently for the first 30 days and then rarely. Which TWO storage solutions meet these requirements? (Choose TWO)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon S3 with lifecycle policies
Amazon S3 with lifecycle policies is correct because S3 provides low-latency access to unstructured blobs (up to 5 TB each) with high throughput, and lifecycle policies can automatically transition objects to colder storage tiers (e.g., S3 Glacier Deep Archive) after 30 days, matching the access pattern of frequent then rare access.
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.
✓
Amazon S3 with lifecycle policies
Why this is correct
S3 can handle large objects and lifecycle policies automate transitions to cost-optimized storage.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon EBS with io2 Block Express volumes
Why it's wrong here
EBS volumes are attached to a single EC2 instance and not ideal for shared access to large blobs.
✗
Amazon EFS
Why it's wrong here
EFS is a file system for Linux, but throughput may not be as high as FSx for Lustre for very large objects.
✗
Amazon RDS for PostgreSQL
Why it's wrong here
RDS is a relational database, not for unstructured blobs.
✓
Amazon FSx for Lustre
Why this is correct
FSx for Lustre provides high throughput and low latency for large files and can be integrated with S3.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse block storage (EBS) or file storage (EFS) with object storage (S3), or overlook that lifecycle policies are the key to handling the 'frequent then rare' access pattern, leading them to choose EBS or EFS for blob storage.
Detailed technical explanation
How to think about this question
Amazon S3 supports objects up to 5 TB in size via multipart upload, and its S3 Lifecycle policies use rules based on object age (e.g., 30 days) to transition to S3 Glacier Deep Archive, which offers retrieval times of 12 hours. Under the hood, S3 uses a distributed key-value store with eventual consistency, optimized for high throughput via parallel requests, making it ideal for large blobs with changing access patterns.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Amazon S3 with lifecycle policies — Amazon S3 with lifecycle policies is correct because S3 provides low-latency access to unstructured blobs (up to 5 TB each) with high throughput, and lifecycle policies can automatically transition objects to colder storage tiers (e.g., S3 Glacier Deep Archive) after 30 days, matching the access pattern of frequent then rare access.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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