DP-300 Practice Question: Monitor, configure, and optimize database resources
You manage an Azure SQL Managed Instance that hosts a critical OLTP database. You notice that the average CPU usage is consistently above 90% during business hours. You have enabled Intelligent Insights, which recommends creating a missing index. What should you do first to validate the recommendation before implementing it?
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
✓
Use Query Store to review query performance and missing index details.
Use Query Store to review query performance and missing index details. Intelligent Insights provides recommendations, but you should validate them using Query Store, which shows actual query performance and missing index details. This helps confirm the index will reduce CPU usage without negative side effects. B is wrong because scaling up increases resources but doesn't address the root cause; it may be unnecessary. C is wrong because automatic index tuning would implement changes without validation, which could be risky. D is wrong because creating the index immediately without validation might cause performance issues or be unnecessary.
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 Query Store to review query performance and missing index details.
Why this is correct
Using Query Store allows you to review query performance and missing index details to validate the recommendation before implementation.
- ✗
Scale up the managed instance to a higher tier.
Why it's wrong here
Scaling up the managed instance increases resources but does not address the root cause and may be unnecessary if the index resolves the issue.
- ✗
Enable automatic index tuning.
Why it's wrong here
Enabling automatic index tuning would implement changes without validation, which could be risky without first confirming the index's impact.
- ✗
Create the recommended index immediately.
Why it's wrong here
Creating the index immediately without validation might cause performance issues or be unnecessary; validation is needed first.
Go deeper
Related to this question
Learn chapter
Overview of Azure Data Platform Options
Key term
Azure SQL Managed Instance
Azure SQL Managed Instance is a fully managed cloud database service that gives you nearly all the features of Microsoft SQL Server on your own server, without you having to manage the hardware or operating system.
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.
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