Quick Answer
The answer is the Cool storage tier. This is correct because Cool tier is specifically engineered for infrequently accessed data that must be retained long-term, offering significantly lower storage costs than the Hot tier while still providing low-latency retrieval when needed. For a 7-year retention of historical sales data, Cool tier balances cost efficiency with accessibility, as it has a 30-day minimum storage duration and is optimized for rare reads rather than frequent writes. On the Microsoft Azure Data Fundamentals DP-900 exam, this scenario tests your understanding of Azure storage tier selection for cost optimization, often appearing as a scenario where you must match data access patterns to the correct tier. A common trap is choosing Archive tier for data that still requires occasional access, but remember: Archive is for offline, rarely accessed data with hours-long retrieval, while Cool is for data accessed infrequently but still needing quick availability. Memory tip: "Cool for quarterly, Archive for yearly" — if you need to access it a few times a year, choose Cool.
This DP-900 practice question tests your understanding of describe core data concepts. 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 company wants to store historical sales data for long-term analysis. The data is accessed infrequently but must be retained for 7 years. Which Azure storage tier minimizes cost while meeting these requirements?
Archive storage tier
Why wrong: Archive tier is for rarely accessed data with long retention, but requires at least 180 days.
Premium storage tier
Why wrong: Premium tier is for high-performance, high-cost scenarios.
Cool storage tier
Cool tier is for infrequently accessed data, lower cost.
Hot storage tier
Why wrong: Hot tier is for frequently accessed data, higher cost.
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 storage tier
The Cool storage tier is designed for data that is accessed infrequently but must be retained for extended periods, offering lower storage costs than Hot tier while still providing low-latency access when needed. With a 30-day minimum storage duration and a cost structure optimized for infrequent reads, it balances cost and accessibility for 7-year retention of historical sales data.
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.
Archive storage tier
Why it's wrong here
Archive tier is for rarely accessed data with long retention, but requires at least 180 days.
Premium storage tier
Why it's wrong here
Premium tier is for high-performance, high-cost scenarios.
Cool storage tier
Why this is correct
Cool tier is for infrequently accessed data, lower cost.
Related concept
Read the scenario before looking for a memorised answer.
Hot storage tier
Why it's wrong here
Hot tier is for frequently accessed data, higher cost.
Common exam traps
The trap here is that candidates often choose the Archive tier because it has the lowest storage cost, forgetting that retrieval latency and higher access costs make it unsuitable for data that may need to be accessed even occasionally during the retention period.
Trap categories for this question
Scenario analysis trap
Premium tier is for high-performance, high-cost scenarios.
Detailed technical explanation
Azure Blob Storage tiers use different pricing models: Cool tier charges lower per-GB storage fees but has a 30-day minimum billing period and a higher per-operation cost for reads compared to Hot tier. For long-term retention, the Archive tier could be considered, but it requires rehydration (which can take up to 15 hours) before data can be read, making it impractical if occasional queries are needed. A real-world scenario might involve a company that needs to run quarterly reports on 7-year-old sales data, where Cool tier provides the right balance of cost and access speed.
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
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Cool storage tier — The Cool storage tier is designed for data that is accessed infrequently but must be retained for extended periods, offering lower storage costs than Hot tier while still providing low-latency access when needed. With a 30-day minimum storage duration and a cost structure optimized for infrequent reads, it balances cost and accessibility for 7-year retention of historical sales data.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DP-900 practice question is part of Courseiva's free Microsoft 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 DP-900 exam.
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