Quick Answer
The Cool tier is the correct choice because it is specifically designed as a cost-effective storage tier for infrequent access data, offering low storage costs while supporting retrieval within seconds to hours, which fully satisfies the 24-hour requirement for compliance reports. This tier is optimized for data that remains stored for at least 30 days and is accessed rarely, making it ideal for append-only historical sales data where minimizing cost is critical but immediate access is not needed. On the Microsoft Azure Data Engineer Associate DP-203 exam, this scenario tests your understanding of Azure Blob Storage access tiers and the trade-offs between cost and latency, often appearing as a trap where candidates mistakenly choose Archive tier for its lower storage cost, forgetting the 24-hour retrieval constraint. A common memory tip is to remember that “Cool is for compliance” — it keeps costs low without the long rehydration delays of Archive, so if you need data back within a day, always pick Cool over Archive.
This DP-203 practice question tests your understanding of design and implement data storage. 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 designing a solution to store historical sales data for a retail company. The data is append-only and accessed infrequently for compliance reports. The solution must minimize storage costs while allowing retrieval within 24 hours. Which storage tier should be used for the data?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Hot tier
Why wrong: More expensive; for frequently accessed data.
Archive tier
Why wrong: Retrieval time is hours, but can exceed 24 hours.
Cool tier
Cost-effective for infrequently accessed data with retrieval within hours.
Premium tier
Why wrong: High cost; for low-latency access.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cool tier
The Cool tier is the correct choice because it is optimized for data that is infrequently accessed and stored for at least 30 days, offering low storage costs with retrieval times in the range of seconds to hours, which meets the 24-hour retrieval requirement. The data is append-only and used for compliance, so the Cool tier balances cost and accessibility without the high retrieval costs or long rehydration delays of the Archive tier.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Hot tier
Why it's wrong here
More expensive; for frequently accessed data.
Archive tier
Why it's wrong here
Retrieval time is hours, but can exceed 24 hours.
Cool tier
Why this is correct
Cost-effective for infrequently accessed data with retrieval within hours.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Premium tier
Why it's wrong here
High cost; for low-latency access.
Common exam traps
The trap here is that candidates often choose the Archive tier because it has the lowest storage cost, overlooking the rehydration latency and the fact that retrieval within 24 hours is not guaranteed with standard priority rehydration, especially under heavy demand.
Detailed technical explanation
In Azure Blob Storage, the Cool tier has a 30-day minimum storage duration and a higher per-GB read cost than Hot, but for append-only compliance data that is rarely accessed, the trade-off is acceptable. The Archive tier uses offline storage (blobs are in an 'archived' state) and requires a rehydration operation (changing the tier to Hot or Cool) before reading, which can take up to 15 hours for standard priority; this latency and the associated rehydration costs (both per GB and per operation) make it risky for a 24-hour SLA. The Premium tier uses SSDs and is optimized for consistent low-latency (single-digit milliseconds) but at a significantly higher price point, which is wasteful for cold data.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Design and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
The correct answer is: Cool tier — The Cool tier is the correct choice because it is optimized for data that is infrequently accessed and stored for at least 30 days, offering low storage costs with retrieval times in the range of seconds to hours, which meets the 24-hour retrieval requirement. The data is append-only and used for compliance, so the Cool tier balances cost and accessibility without the high retrieval costs or long rehydration delays of the Archive tier.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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