DP-300 Practice Question: Monitor, configure, and optimize database resources
You are managing an Azure SQL Database that has Automatic Tuning enabled. You receive an alert that a query plan regression was detected and a plan correction was automatically applied. You want to verify the performance improvement. What should you use?
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
✓
Query the Query Store to compare query performance before and after the plan change.
Query Store provides detailed query performance data, including plan regressions and improvements. Option A is wrong because sys.dm_exec_query_stats gives current performance metrics but does not provide historical comparison. Option B is wrong because Azure Monitor alert details only notify that a regression occurred, not the performance improvement. Option D is wrong because the automatic tuning log shows actions taken but not detailed performance metrics for comparison.
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 sys.dm_exec_query_stats to view current performance.
Why it's wrong here
Only shows current stats, not historical.
- ✗
Review the Azure Monitor alert details.
Why it's wrong here
Alert only indicates regression occurred, not improvement.
- ✓
Query the Query Store to compare query performance before and after the plan change.
Why this is correct
Query Store tracks performance over time, allowing comparison.
- ✗
Check the automatic tuning log in the Azure portal.
Why it's wrong here
Log shows actions but not performance metrics.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Query Store
Query Store is a built-in SQL Server feature that captures and stores a history of query execution plans and performance data for easy monitoring and troubleshooting.
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
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