- A
sys.dm_exec_query_stats
Why wrong: Shows execution statistics, not wait types.
- B
Query Store Wait Stats in SSMS
Why wrong: Tracks waits per query but not aggregate top resource waits.
- C
sys.dm_os_wait_stats
Provides cumulative wait statistics for all sessions.
- D
sys.dm_db_index_usage_stats
Why wrong: Shows index usage, not wait statistics.
Question 476 of 963
DP-300 Practice Question: Monitor, configure, and optimize database resources
This DP-300 practice question tests your understanding of monitor, configure, and optimize database resources. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You have a SQL Managed Instance that hosts a critical OLTP database. You notice that the average query wait time has increased significantly over the past hour. You need to identify the top resource waits. 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
✓
sys.dm_os_wait_stats
C is correct because sys.dm_os_wait_stats is the dynamic management view that aggregates wait statistics across all sessions in the SQL Server instance, including SQL Managed Instance. It provides cumulative wait times categorized by wait type (e.g., PAGEIOLATCH, LCK_M_S), making it the appropriate tool to identify top resource waits when average query wait time increases.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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_exec_query_stats
Why it's wrong here
Shows execution statistics, not wait types.
- ✗
Query Store Wait Stats in SSMS
Why it's wrong here
Tracks waits per query but not aggregate top resource waits.
- ✓
sys.dm_os_wait_stats
Why this is correct
Provides cumulative wait statistics for all sessions.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
sys.dm_db_index_usage_stats
Why it's wrong here
Shows index usage, not wait statistics.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse performance metrics DMVs (like sys.dm_exec_query_stats) with wait statistics DMVs, or they assume Query Store Wait Stats is the primary diagnostic tool for real-time wait analysis, when sys.dm_os_wait_stats is the direct and authoritative source for identifying top resource waits.
Trap categories for this question
Command / output trap
Shows execution statistics, not wait types.
Detailed technical explanation
How to think about this question
sys.dm_os_wait_stats resets when the instance restarts or when DBCC SQLPERF('sys.dm_os_wait_stats', CLEAR) is executed, so it reflects cumulative waits since last reset. In a SQL Managed Instance, this DMV includes cloud-specific wait types like WAITFOR and THREADPOOL, and analyzing the top wait types (e.g., by wait_time_ms descending) helps pinpoint whether the bottleneck is I/O, locking, CPU, or network latency.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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Monitor, configure, and optimize database resources — study guide chapter
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FAQ
Questions learners often ask
What does this DP-300 question test?
Monitor, configure, and optimize database resources — This question tests Monitor, configure, and optimize database resources — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: sys.dm_os_wait_stats — C is correct because sys.dm_os_wait_stats is the dynamic management view that aggregates wait statistics across all sessions in the SQL Server instance, including SQL Managed Instance. It provides cumulative wait times categorized by wait type (e.g., PAGEIOLATCH, LCK_M_S), making it the appropriate tool to identify top resource waits when average query wait time increases.
What should I do if I get this DP-300 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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