The answer is Azure Blob Storage with the cool tier. This is the most appropriate solution because it is specifically designed to store large amounts of unstructured log data at low cost, with the cool tier offering significantly reduced storage fees compared to the hot tier for infrequently accessed data like logs, while maintaining high durability and scalability. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of how Azure storage tiers align with access patterns and cost optimization, often appearing as a scenario where you must differentiate between Blob Storage, Azure Files, and Azure SQL Database. A common trap is choosing the hot tier due to its faster access, but logs are rarely read immediately after being written, making the cool tier the cost-efficient choice. Remember the memory tip: “Cool logs, hot apps”—use the cool tier for archival or infrequent data like logs, and the hot tier for frequently accessed application data.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 needs to store and analyze large amounts of unstructured log data at low cost. Which Azure storage solution is MOST appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Blob Storage with cool tier
Azure Blob Storage with cool tier is the most appropriate solution because it is optimized for storing large amounts of unstructured log data at low cost. The cool tier offers lower storage costs than the hot tier, making it ideal for infrequently accessed data like logs, while still providing high durability and scalability. Blob Storage natively supports unstructured data such as text logs, binary files, and streaming data, which aligns perfectly with the requirement.
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.
✗
Azure SQL Database
Why it's wrong here
SQL Database is for structured relational data with ACID transactions — not cost-optimized for large unstructured log storage.
✗
Azure Table Storage
Why it's wrong here
Table Storage is for semi-structured data with simple key-value access, not optimized for large-scale analytics.
✓
Azure Blob Storage with cool tier
Why this is correct
Blob Storage with Cool or Archive tier provides low-cost storage for large volumes of unstructured data like logs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Files
Why it's wrong here
Azure Files is a managed file share service — not optimized for cost-effective large-scale unstructured data storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Table Storage (a NoSQL key-value store) with a cost-effective solution for unstructured data, but it is actually designed for semi-structured data and lacks the low-cost tiering and append capabilities of Blob Storage for log analytics.
Detailed technical explanation
How to think about this question
Under the hood, Azure Blob Storage uses a flat namespace with containers and blobs, supporting block blobs for log data that can be appended incrementally. The cool tier has a lower storage cost (approximately $0.01/GB/month) but higher access costs and a 30-day minimum storage duration, making it a trade-off that suits infrequent read patterns. In real-world scenarios, companies often use Blob Storage with lifecycle management policies to automatically transition logs from hot to cool to archive tiers, optimizing costs over time.
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 AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Blob Storage with cool tier — Azure Blob Storage with cool tier is the most appropriate solution because it is optimized for storing large amounts of unstructured log data at low cost. The cool tier offers lower storage costs than the hot tier, making it ideal for infrequently accessed data like logs, while still providing high durability and scalability. Blob Storage natively supports unstructured data such as text logs, binary files, and streaming data, which aligns perfectly with the requirement.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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