DP-300 Practice Question: Monitor, configure, and optimize database resources
Your Azure SQL Database is hitting the DTU limit frequently during business hours. You need to identify which queries are consuming the most DTU. What should you do?
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 sys.dm_exec_query_stats and correlate with sys.dm_db_resource_stats.
Querying sys.dm_exec_query_stats and correlating with sys.dm_db_resource_stats allows you to identify which specific queries are consuming the most DTU. sys.dm_db_resource_stats provides DTU consumption data at the database level, while sys.dm_exec_query_stats gives query-level performance metrics. By joining these two DMVs, you can pinpoint the top DTU-consuming queries during business hours.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Query sys.dm_db_resource_stats to see DTU usage per minute.
Why it's wrong here
Sys.dm_db_resource_stats shows DTU usage per minute, but it does not provide per-query granularity.
- ✗
Use Azure Metrics for SQL Database to view DTU consumption per database.
Why it's wrong here
Azure Metrics for SQL Database shows aggregate DTU consumption per database, not per query.
- ✗
Enable Query Store and review the Wait Statistics report.
Why it's wrong here
Query Store's Wait Statistics report shows wait types and durations, but it does not directly correlate to DTU consumption by query.
- ✓
Query sys.dm_exec_query_stats and correlate with sys.dm_db_resource_stats.
Why this is correct
Querying sys.dm_exec_query_stats and correlating with sys.dm_db_resource_stats enables per-query DTU analysis.
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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