AZ-204 Develop for Azure storage Practice Question
You are designing a solution to store large amounts of unstructured data that is accessed infrequently (once a quarter). You need to minimize storage costs. Which Azure storage tier should you use?
⚠ Common exam trap
Many candidates confuse 'Cold' with 'Cool' or assume 'Archive' is always the cheapest option without considering retrieval latency and minimum storage duration penalties.
Answer choices
Why each option matters
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 designed for data that is accessed infrequently (about once a quarter) and stored for at least 30 days, offering lower storage costs than Hot while still providing low-latency access. Since the data is unstructured and accessed only quarterly, Cool balances cost and availability without the long retrieval time or minimum storage duration of Archive.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cold
Why it's wrong here
The 'Cold' tier is not a recognized access tier within Azure Blob Storage. Azure provides Hot, Cool, and Archive tiers, each designed for different access patterns and cost optimizations. Selecting 'Cold' would be incorrect as it does not correspond to any available storage option in Azure, making it an invalid choice for designing a storage solution.
- ✗
Hot
Why it's wrong here
The Hot access tier is optimized for frequently accessed data, offering the lowest access costs and highest performance for read/write operations. While it provides immediate availability, its storage costs are the highest among the Azure Blob Storage tiers. Therefore, it would be an inefficient and overly expensive choice for data that is only accessed infrequently, as implied by the problem statement.
- ✗
Archive
Why it's wrong here
The Archive access tier is designed for long-term data retention, offering the lowest storage costs but with significantly higher data retrieval costs and latency, typically taking hours to rehydrate data. This tier is suitable for data accessed less than once a year, such as compliance archives or backups that are rarely needed. For data that might be accessed every 30 days or more, the retrieval time and cost associated with Archive would be prohibitive and impractical.
- ✓
Cool
Why this is correct
The Cool access tier is ideal for infrequently accessed data that still requires quick retrieval, typically accessed every 30 days or more. It offers a balance between storage costs and access costs, being cheaper to store than Hot but more expensive to access. This tier is well-suited for scenarios like short-term backups, older media content, or data that is not actively used but may be needed on demand, aligning with the requirement for infrequently accessed data.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
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