Question 141 of 919
DP-300 Practice Question: Monitor, configure, and optimize database resources
You are monitoring an Azure SQL Managed Instance using dynamic management views. You want to identify which queries are consuming the most IOPS. Which DMV 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
✓
sys.dm_exec_query_stats
Sys.dm_exec_query_stats provides per-query execution statistics, including I/O metrics such as total_logical_reads and total_logical_writes, which can be used to identify queries consuming the most IOPS. Option A is incorrect because sys.dm_db_io_stats is not a valid DMV in Azure SQL Managed Instance and does not provide per-query I/O information. Option B is incorrect because sys.dm_os_performance_counters provides OS-level performance counters, not per-query I/O. Option D is incorrect because sys.dm_db_index_usage_stats tracks index usage statistics, not query I/O.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
sys.dm_db_io_stats
Why it's wrong here
sys.dm_db_io_stats is not a valid DMV in Azure SQL Managed Instance and does not provide per-query I/O information.
- ✗
sys.dm_os_performance_counters
Why it's wrong here
Provides OS-level performance counters, not per-query I/O.
- ✓
sys.dm_exec_query_stats
Why this is correct
Provides per-query execution statistics including I/O metrics like total_logical_reads and total_logical_writes, which can be used to identify queries consuming the most IOPS.
- ✗
sys.dm_db_index_usage_stats
Why it's wrong here
Tracks index usage statistics, not query I/O.
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Last reviewed: Jun 21, 2026
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