The answer is Azure Blob Storage immutability policy with time-based retention. This is the correct choice because it enforces write-once-read-many (WORM) protection at the container level, ensuring that transaction data cannot be modified or deleted for a specified period—in this case, seven years—directly meeting the audit compliance requirement for immutable storage with time-based retention. On the Microsoft Azure Data Engineer Associate DP-203 exam, this concept tests your understanding of data protection and compliance features within Azure Storage, often appearing in scenario-based questions where you must distinguish between time-based retention and legal hold policies. A common trap is confusing immutability policies with soft delete or versioning, which do not guarantee true immutability against deletion. Remember the memory tip: “Time locks the data, legal holds the case”—time-based retention sets a fixed expiration, while legal hold is indefinite.
DP-203 Design and implement data storage Practice Question
This DP-203 practice question tests your understanding of design and implement data storage. 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 financial services company needs to store transaction data for audit purposes. The data must be immutable and cannot be modified or deleted for 7 years. Which Azure storage feature should be used?
Azure Blob Storage immutability policy with time-based retention ensures that blobs cannot be modified or deleted for a specified retention period (e.g., 7 years). This meets the audit requirement for immutable storage by locking the data at the storage level, preventing any writes or deletes until the retention interval expires. The policy is enforced at the container level and applies to all blobs within, making it the correct choice for regulatory compliance.
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.
Immutability policies enforce WORM (Write Once, Read Many) for a specified duration.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Blob Storage soft delete.
Why it's wrong here
Soft delete only retains deleted blobs for a period; it does not prevent modification.
✗
Azure Blob Storage versioning.
Why it's wrong here
Versioning retains history but does not prevent deletion of current version.
✗
Azure Files share snapshots.
Why it's wrong here
Share snapshots provide point-in-time copies but can be deleted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse soft delete or versioning with immutability, not realizing that only a locked time-based retention policy provides the strict write-once, read-many guarantee required for audit data that cannot be modified or deleted for a fixed duration.
Detailed technical explanation
How to think about this question
Time-based retention policies in Azure Blob Storage are enforced via a WORM (Write Once, Read Many) model, where the policy is set at the container level and can be locked to prevent removal. Once locked, even storage account administrators cannot shorten the retention period or delete blobs until the interval expires. This is critical for SEC Rule 17a-4(f) compliance, which requires immutable storage for financial records, and the policy supports granularity down to seconds for the retention period.
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-203 question in full detail.
Design and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Blob Storage immutability policy (time-based retention). — Azure Blob Storage immutability policy with time-based retention ensures that blobs cannot be modified or deleted for a specified retention period (e.g., 7 years). This meets the audit requirement for immutable storage by locking the data at the storage level, preventing any writes or deletes until the retention interval expires. The policy is enforced at the container level and applies to all blobs within, making it the correct choice for regulatory compliance.
What should I do if I get this DP-203 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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