DP-300 Practice Question: Monitor, configure, and optimize database resources
You manage an Azure SQL Database that uses automatic tuning. The database has the FORCE_LAST_GOOD_PLAN option enabled. A critical query suddenly starts performing poorly after a plan change. What is the expected behavior?
⚠ Common exam trap
Watch out — candidates often confuse FORCE_LAST_GOOD_PLAN with the default automatic tuning recommendation mode, which only suggests changes without automatic reversion, leading them to pick Option B or D.
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
✓
The database will automatically revert to the last good plan and log the event in sys.dm_db_tuning_recommendations.
When FORCE_LAST_GOOD_PLAN is enabled and automatic tuning detects a plan regression, Azure SQL Database automatically reverts to the last known good plan. The event is logged in sys.dm_db_tuning_recommendations for audit and analysis. This behavior is part of the automatic plan correction feature, which does not require manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The query will continue with the poor plan until you manually force a plan.
Why it's wrong here
Automatic tuning reverts automatically.
- ✗
You will receive a recommendation to revert the plan change.
Why it's wrong here
The system will auto-revert, not just recommend.
- ✓
The database will automatically revert to the last good plan and log the event in sys.dm_db_tuning_recommendations.
Why this is correct
Auto-revert occurs and is logged in the tuning recommendations DMV.
- ✗
The database will automatically revert to the last good plan without notification.
Why it's wrong here
It will revert automatically, but Azure provides notifications.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DP-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-300 exam.