The answer is the Cool access tier. This is the correct choice because it provides the same millisecond-scale retrieval latency as the Hot tier, ensuring the archived customer correspondence PDFs are available for read within seconds, while offering significantly lower storage costs for data that is rarely accessed. On the Microsoft Azure Data Fundamentals DP-900 exam, this question tests your understanding of how Azure Blob Storage tiers balance cost against access frequency and latency requirements; a common trap is assuming that all archived data must go to the Cold or Archive tiers, which have higher retrieval times or costs for immediate access. The key distinction is that Cool tier is designed for data that is infrequently accessed but still needs instant availability, making it the optimal choice over Hot for minimizing storage cost without sacrificing retrieval speed. A helpful memory tip: think of "Cool" as the middle ground—it keeps your data "cool" in storage but still "hot" on retrieval.
DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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 must archive customer correspondence PDFs that are rarely accessed but must be retained for seven years. The documents must be available for read within seconds if requested. Which Azure Blob Storage access tier should be used to minimize storage cost while meeting the availability requirement?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cool
The Cool tier is optimal because it balances low storage cost with high availability for data that is infrequently accessed but must be retrievable within seconds. It offers the same low-latency retrieval as the Hot tier (milliseconds) but at a lower storage price, making it ideal for archived correspondence that still requires immediate read 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.
✗
Hot
Why it's wrong here
Hot tier is for frequently accessed data and has higher storage cost, which is not needed here.
✓
Cool
Why this is correct
Cool tier is for infrequent access with immediate availability and lower storage cost than Hot.
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.
✗
Archive
Why it's wrong here
Archive tier offers the lowest storage cost but retrieval can take hours, violating the 'within seconds' requirement.
✗
Premium
Why it's wrong here
Premium tier provides low-latency for high transaction volumes but is very expensive and not intended for archival.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'archived' and immediately choose the Archive tier, forgetting the 'within seconds' availability requirement that disqualifies it.
Detailed technical explanation
How to think about this question
Under the hood, Azure Blob Storage tiers use different physical media and replication strategies; the Cool tier leverages lower-cost HDDs while still keeping data online for immediate reads. A subtle behavior is that the Cool tier incurs a higher per-GB read cost than Hot, so for data that is accessed even occasionally, the total cost may exceed Hot—but for rarely accessed archives, the storage savings dominate. In real-world scenarios, compliance requirements like SEC Rule 17a-4 often mandate immediate retrieval of archived records, making Cool the correct choice over Archive.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-900 question in full detail.
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cool — The Cool tier is optimal because it balances low storage cost with high availability for data that is infrequently accessed but must be retrievable within seconds. It offers the same low-latency retrieval as the Hot tier (milliseconds) but at a lower storage price, making it ideal for archived correspondence that still requires immediate read access.
What should I do if I get this DP-900 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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company stores backup files in Azure Blob Storage. The backups are taken daily and must be retained for 7 years. The backup files are rarely accessed after the first month. The company wants to minimize storage costs while ensuring that backups are available for retrieval within 5 hours when needed. Which storage tier should they use after the first month?
medium
A.Archive tier
✓ B.Cool tier
C.Hot tier
D.Premium tier
Why B: Option C is correct because the Cool tier has a retrieval time of minutes to hours (typically), and is cheaper than Hot. Archive tier is the cheapest but retrieval time can be up to 15 hours, which exceeds the 5-hour requirement. Option A is wrong because Hot is more expensive. Option B is wrong because Archive retrieval time is too long. Option D is wrong because Premium is expensive and designed for low-latency access.
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Question Discussion
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