The correct answer is immutable storage with a time-based retention policy. This feature, also known as WORM (Write Once, Read Many), enforces a retention interval during which blobs cannot be deleted or overwritten, directly satisfying the 90-day compliance requirement for the user profile images. On the Microsoft Azure Data Fundamentals DP-900 exam, this concept tests your understanding of how Azure Blob Storage supports regulatory compliance through data immutability, often appearing in scenarios involving legal holds or audit retention. A common trap is confusing immutable storage with soft delete—while soft delete recovers accidentally deleted data, it does not prevent deletion or modification during a set period. Remember the key distinction: immutable storage locks data for a fixed duration, whereas soft delete merely provides a recovery window. For a memory tip, think "WORM locks the data in time" to recall that time-based retention policies create a write-once, read-many state that regulators demand.
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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 media company stores user profile images in Azure Blob Storage. Regulators require that the images cannot be deleted or overwritten for a period of 90 days after upload. Which Azure Blob Storage feature should the company enable to meet this requirement?
Why wrong: Soft delete protects against accidental deletion by enabling recovery, but it does not prevent deletion itself; blobs can still be deleted and then restored within a retention period.
B
B: Immutable storage with a time-based retention policy
Immutable storage enforces a write-once-read-many (WORM) state, preventing any modification or deletion during the retention period, exactly as required.
C
C: Access tiers (Hot, Cool, Archive)
Why wrong: Access tiers optimize storage costs based on access frequency but do not provide any delete protection.
D
D: Lifecycle management rules
Why wrong: Lifecycle management automates moving blobs between tiers or deleting them; it does not prevent deletion or overwrites.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
B: Immutable storage with a time-based retention policy
Immutable storage with a time-based retention policy (also known as WORM – Write Once, Read Many) prevents blobs from being deleted or overwritten for a specified retention interval. By setting a 90-day policy, the company ensures that user profile images remain unmodifiable and undeletable during that period, directly satisfying the regulatory 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.
✗
A: Soft delete
Why it's wrong here
Soft delete protects against accidental deletion by enabling recovery, but it does not prevent deletion itself; blobs can still be deleted and then restored within a retention period.
✓
B: Immutable storage with a time-based retention policy
Why this is correct
Immutable storage enforces a write-once-read-many (WORM) state, preventing any modification or deletion during the retention period, exactly as required.
Related concept
Read the scenario before looking for a memorised answer.
✗
C: Access tiers (Hot, Cool, Archive)
Why it's wrong here
Access tiers optimize storage costs based on access frequency but do not provide any delete protection.
✗
D: Lifecycle management rules
Why it's wrong here
Lifecycle management automates moving blobs between tiers or deleting them; it does not prevent deletion or overwrites.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse soft delete (which only recovers deleted blobs) with immutable storage (which prevents both deletion and overwrite during the retention period), leading them to choose soft delete when the requirement explicitly prohibits overwrites as well.
Detailed technical explanation
How to think about this question
Immutable storage leverages a time-based retention policy that sets a legal hold or retention interval at the container or blob level, enforced by Azure Storage's internal WORM engine. Once applied, any attempt to delete or overwrite the blob returns a 409 (Conflict) error, and the policy cannot be shortened or removed until the retention period expires. This feature is critical for compliance with regulations like SEC 17a-4(f) or FINRA, which require data to be stored in a non-erasable, non-rewritable format.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: B: Immutable storage with a time-based retention policy — Immutable storage with a time-based retention policy (also known as WORM – Write Once, Read Many) prevents blobs from being deleted or overwritten for a specified retention interval. By setting a 90-day policy, the company ensures that user profile images remain unmodifiable and undeletable during that period, directly satisfying the regulatory requirement.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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