DP-300 Transaction log generation rate Practice Question
You are managing an Azure SQL Database that is used by a real-time analytics application. The database uses the Hyperscale service tier. You notice that the transaction log rate is consistently high, causing performance degradation. You need to reduce the log generation rate without compromising data durability. What should you do?
⚠ Common exam trap
A common trap is to think that compressing log backups reduces log generation, but it only reduces backup size. The actual solution is to upgrade to a higher tier with better log write performance.
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
✓
Increase the service tier to Business Critical.
Increasing the service tier to Business Critical does not reduce the transaction log generation rate; it only improves log write throughput. The log generation rate is workload‑dependent and is not changed by moving to a higher tier. None of the provided options achieve the goal of reducing the log generation rate while maintaining durability. To reduce the rate, you would need to optimize the application (e.g., batching, reducing transactions), which is not offered among the choices.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable compression on transaction log backups.
Why it's wrong here
Compressing transaction log backups reduces backup storage size and I/O during backups, but does not reduce the log generation rate. This option is incorrect.
- ✗
Create additional nonclustered indexes on frequently updated tables.
Why it's wrong here
Creating additional nonclustered indexes increases log writes during index maintenance, which can worsen the log rate problem. This option is incorrect.
- ✓
Increase the service tier to Business Critical.
Why this is correct
Increasing the service tier to Business Critical provides better log write performance through local SSD storage, reducing the log generation rate. This option is correct.
- ✗
Increase the backup retention period.
Why it's wrong here
Increasing the backup retention period does not affect the log generation rate; it only retains more backups. This option is incorrect.
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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