DP-300 Practice Question: Monitor, configure, and optimize database resources
You have an Azure SQL Database with automatic tuning enabled. You notice that a query that previously ran quickly is now running slower. Automatic tuning has implemented a plan correction. However, the new plan is performing worse. What should you do to revert to the previous behavior?
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
✓
Revert the automatic tuning plan correction using the Azure portal or T-SQL
When automatic tuning implements a plan correction that performs worse, you can manually revert the plan correction using the Azure portal or T-SQL commands (e.g., `ALTER DATABASE ... SET AUTOMATIC_TUNING ...` or querying `sys.dm_db_tuning_recommendations` and using the `revert` action). Option A is incorrect because dropping and recreating the index does not revert the plan correction; it may force a new plan but is not the direct revert method. Option B is incorrect because automatic tuning does not automatically revert a plan correction that is performing worse; it may later adjust, but manual intervention is the reliable way. Option C is incorrect because disabling automatic tuning would only prevent future corrections but not revert the current one; the plan would remain until manually reverted or statistics change.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Drop and recreate the index used by the query
Why it's wrong here
Index recreation may not revert the plan correction.
- ✗
Wait for automatic tuning to revert the plan automatically
Why it's wrong here
Automatic tuning does not automatically revert; it may create another correction.
- ✗
Disable automatic tuning for the database
Why it's wrong here
Disabling stops new corrections but does not revert the current one.
- ✓
Revert the automatic tuning plan correction using the Azure portal or T-SQL
Why this is correct
You can revert the plan to the previous one manually.
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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