DP-300 Practice Question: Monitor, configure, and optimize database resources
You manage an Azure SQL Database that is experiencing higher than expected DTU consumption. You need to identify which queries are consuming the most resources. Which dynamic management view should you query?
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
sys.dm_exec_query_stats returns aggregate performance statistics for cached query plans, including CPU time, logical reads, and duration, making it ideal for identifying queries that consume the most resources in Azure SQL Database. Option A (sys.dm_exec_requests) shows only currently executing requests, not historical data. Option B (sys.dm_os_wait_stats) provides server-level wait statistics, not per-query resource usage. Option D (sys.dm_db_resource_stats) shows database-level DTU consumption per minute, not per-query details.
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_exec_requests
Why it's wrong here
Incorrect. sys.dm_exec_requests shows only currently executing requests, which does not help identify historical high-resource queries.
- ✗
Query sys.dm_os_wait_stats
Why it's wrong here
Incorrect. sys.dm_os_wait_stats provides server-level wait statistics, not per-query resource consumption.
- ✓
Query sys.dm_exec_query_stats
Why this is correct
Correct. sys.dm_exec_query_stats returns aggregate performance statistics for cached query plans, allowing identification of queries with high CPU, I/O, or duration.
- ✗
Query sys.dm_db_resource_stats
Why it's wrong here
Incorrect. sys.dm_db_resource_stats shows database-level DTU consumption over time, not per-query resource usage.
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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