Describe considerations for working with non-relational data on Azure →hardMultiple ChoiceObjective-mapped
Azure Blob Lifecycle Management for Cost Optimization
A company uses Azure Blob Storage to store video files for a streaming service. The files are accessed frequently for the first 30 days after upload, then rarely after. The company wants to minimize storage costs while maintaining fast access for frequently accessed files. What should they implement?
Quick Answer
The answer is Blob lifecycle management policies. This is the correct choice because these policies automate the transition of blobs to cooler, more cost-effective access tiers—such as moving from Hot to Cool or Archive—based on age or last modification time, directly aligning with the need to reduce costs for rarely accessed video files after 30 days while preserving fast Hot-tier access for the initial high-demand period. On the Microsoft Azure Data Fundamentals DP-900 exam, this scenario tests your understanding of Azure Blob Storage lifecycle management for cost optimization, often appearing as a scenario-based question where you must choose the most efficient automation tool over manual tier changes or retention policies. A common trap is selecting Azure Backup or a retention policy, but those focus on data protection, not tier transitions. Memory tip: think of lifecycle policies as a “moving escalator” that automatically shifts data from expensive to cheap storage as it ages.
⚠ Common exam trap
Test-takers frequently confuse cost optimization with performance acceleration, mistakenly choosing Azure CDN (Option A) because it improves access speed, when the question explicitly asks for minimizing storage costs while maintaining fast access for frequently accessed files.
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
✓
Blob lifecycle management policies
Blob lifecycle management policies allow you to automatically transition blobs to cooler, cheaper access tiers (e.g., from Hot to Cool or Archive) based on age. This directly addresses the requirement: after 30 days of frequent access, the policy moves the video files to a lower-cost tier, reducing storage costs while keeping the Hot tier available for the initial high-access period.
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 Content Delivery Network (CDN)
Why it's wrong here
CDN caches content at edge locations for faster delivery, but does not reduce storage costs or change tiering.
- ✗
Azure Files shares
Why it's wrong here
Azure Files is a fully managed file share in the cloud, not designed for cost tiering of blobs.
- ✓
Blob lifecycle management policies
Why this is correct
Lifecycle management automates moving blobs between tiers (Hot, Cool, Archive) based on age, optimizing cost while keeping frequently accessed data in Hot tier.
- ✗
Geo-redundant storage (GRS)
Why it's wrong here
GRS provides geographic replication for durability, not cost savings related to access patterns.
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 |
Go deeper
Related to this question
Learn chapter
Azure SQL Services
Key term
Blob storage
Blob storage is a cloud service for storing large amounts of unstructured data, such as text or binary data, like documents, images, and videos.
Key term
Service
A service is a software component or system that performs a specific function and is available to be used by other programs or users over a network.
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Same concept, more angles
1 more way this is tested on DP-900
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 large video files in Azure Blob Storage. The files are accessed frequently for the first 30 days after upload, then rarely for the next 180 days, and after that they are only needed for compliance but never accessed. The company wants to minimize storage costs while ensuring the files remain durable and accessible. Which strategy should they implement?
medium- A.Store all files in the Cool access tier and apply lifecycle management to move files to the Archive tier after 30 days.
- ✓ B.Store files initially in the Hot tier, then use lifecycle management to move files to Cool after 30 days and to Archive after 210 days.
- C.Store files in the Archive tier from the beginning to maximize cost savings.
- D.Store files in the Premium tier for fast access, then manually delete files after 30 days.
Why B: It aligns the access patterns with the appropriate Azure Blob Storage access tiers: Hot for frequent initial access, Cool for reduced-cost infrequent access after 30 days, and Archive for the lowest-cost long-term retention after 210 days. Azure lifecycle management policies automate these transitions, ensuring durability and accessibility while minimizing costs.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.