Quick Answer
The answer is sys.dm_os_wait_stats because it provides cumulative, server-wide wait statistics that allow you to identify top resource waits across all sessions in Azure SQL Managed Instance. This dynamic management view aggregates wait types and their durations, making it the ideal tool for pinpointing the most significant bottlenecks when average query wait time spikes. On the Microsoft Azure Database Administrator Associate DP-300 exam, this question tests your ability to distinguish between system-level wait analysis and query-specific or index-focused views. A common trap is choosing Query Store Wait Stats, which tracks waits per individual query rather than the overall resource contention you need here. Remember that sys.dm_os_wait_stats is your go-to for a high-level, cumulative picture of where the instance is waiting, while other views serve more granular purposes. A helpful memory tip: “OS waits for the whole system” — the “os” in the view name reminds you it covers the operating system’s perspective on all waits.
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?
sys.dm_exec_query_stats
Why wrong: Shows execution statistics, not wait types.
Query Store Wait Stats in SSMS
Why wrong: Tracks waits per query but not aggregate top resource waits.
sys.dm_os_wait_stats
Provides cumulative wait statistics for all sessions.
sys.dm_db_index_usage_stats
Why wrong: Shows index usage, not wait statistics.
Answer choices
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
Option C is correct because sys.dm_os_wait_stats provides cumulative wait statistics across all sessions, which can be used to identify top waits. Option A is wrong because sys.dm_db_index_usage_stats shows index usage, not waits. Option B is wrong because Query Store Wait Stats tracks waits per query, but the question asks for top resource waits overall. Option D is wrong because sys.dm_exec_query_stats shows execution statistics, not waits.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Shows execution statistics, not wait types.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which DP-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Monitor, configure, and optimize database resources — This question tests Monitor, configure, and optimize database resources — Read the scenario before looking for a memorised answer..
The correct answer is: sys.dm_os_wait_stats — Option C is correct because sys.dm_os_wait_stats provides cumulative wait statistics across all sessions, which can be used to identify top waits. Option A is wrong because sys.dm_db_index_usage_stats shows index usage, not waits. Option B is wrong because Query Store Wait Stats tracks waits per query, but the question asks for top resource waits overall. Option D is wrong because sys.dm_exec_query_stats shows execution statistics, not waits.
Identify which DP-300 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This DP-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-300 exam.
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