The correct answer is immutable storage with a time-based retention policy, because it enforces a Write Once, Read Many (WORM) state that prevents any modification or deletion of blobs until the specified retention period expires. For a healthcare organization storing patient records, this directly satisfies the dual requirement of locking data against premature changes while automatically enforcing a 7-year deletion timeline. On the DP-900 exam, this scenario tests your understanding of how Azure immutable storage supports compliance and data governance, often appearing in questions about regulatory requirements like HIPAA or SEC rules. A common trap is confusing immutable storage with soft delete or versioning—soft delete only protects against accidental deletion but allows modifications, while immutable storage blocks both. Remember the mnemonic: “WORM locks the clock” to recall that time-based retention locks data for a fixed duration, unlike legal hold which is indefinite.
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. 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 healthcare organization stores patient records in Azure Blob Storage and must comply with data retention policies that require deleting records after 7 years. They also need to prevent any modification or deletion of records before the retention period ends. Which Azure feature should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Immutable storage with time-based retention policy
Immutable storage with a time-based retention policy (WORM – Write Once, Read Many) ensures that blobs cannot be modified or deleted until the retention period expires. This directly meets the dual requirement of preventing premature deletion while enforcing a 7-year retention, as the policy locks the data for the specified duration.
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.
✓
Immutable storage with time-based retention policy
Why this is correct
Immutable storage ensures blobs cannot be modified or deleted until the retention period ends.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Backup for Blob Storage
Why it's wrong here
Backup provides restore capability but does not prevent deletion.
✗
Soft delete for Blob Storage
Why it's wrong here
Soft delete recovers deleted blobs but does not prevent deletion in the first place.
✗
Azure Blob Storage lifecycle management
Why it's wrong here
Lifecycle management automates tiering/deletion but does not enforce immutability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse soft delete (which only protects against accidental deletion) or lifecycle management (which automates tiering/expiry) with the strict WORM guarantee required for regulatory compliance, where no modification or deletion is allowed before the retention period ends.
Detailed technical explanation
How to think about this question
Immutable storage uses a time-based retention policy that applies a legal hold or retention interval at the container or blob level, enforced by the Azure Storage service via a WORM lock. Once the policy is set, any attempt to overwrite or delete the blob returns an HTTP 409 (Conflict) error until the retention period elapses. This feature is critical for compliance with regulations like SEC 17a-4 or HIPAA, where data must be preserved in its original state for a fixed duration.
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 core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Immutable storage with time-based retention policy — Immutable storage with a time-based retention policy (WORM – Write Once, Read Many) ensures that blobs cannot be modified or deleted until the retention period expires. This directly meets the dual requirement of preventing premature deletion while enforcing a 7-year retention, as the policy locks the data for the specified duration.
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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Question Discussion
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