DP-300 Plan and implement data platform resources Practice Question
You are designing a solution for storing audit logs from Azure SQL Database. The logs must be retained for 7 years and must be immutable to prevent tampering. Which Azure service should you use?
⚠ Common exam trap
Many exam-takers confuse 'immutable' with 'read-only permissions' (Option A) or assume that a database table (Option C) can be made immutable by restricting permissions, but true immutability requires storage-level WORM enforcement that cannot be bypassed by any user or process.
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
✓
Azure Blob Storage with immutable storage policy
Azure Blob Storage with an immutable storage policy (WORM – Write Once, Read Many) is the correct choice because it ensures that audit logs cannot be modified or deleted for a specified retention period (7 years). This meets the immutability and retention requirements for compliance with regulations such as SOX or HIPAA. Azure SQL Database audit logs can be directly streamed to Azure Blob Storage, making it a seamless and secure storage solution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Azure Files share with read-only permissions
Why it's wrong here
Azure Files does not provide immutable storage.
- ✗
Send logs to Azure Log Analytics workspace
Why it's wrong here
Log Analytics has a maximum retention of 2 years and no immutability.
- ✗
Store logs in an audit table in Azure SQL Database
Why it's wrong here
Database tables can be altered or deleted.
- ✓
Azure Blob Storage with immutable storage policy
Why this is correct
Immutable blob storage prevents deletion and modification.
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
Overview of Azure Data Platform Options
Key term
Azure SQL Performance Tuning
Azure SQL Performance Tuning is the process of optimizing the speed and efficiency of queries and database operations in Microsoft Azure SQL Database or SQL Managed Instance to reduce latency and improve throughput.
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