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.
Exhibit
Refer to the exhibit.
```kql
AzureDiagnostics
| where ResourceProvider == "MICROSOFT.SQL"
| where Category == "QueryStoreRuntimeStatistics"
| summarize avg(avg_duration) by query_id
| top 10 by avg_duration desc
```
You run the KQL query shown in the exhibit. The query returns a list of query IDs. What is the purpose of this query?
Exhibit
Refer to the exhibit.
```kql
AzureDiagnostics
| where ResourceProvider == "MICROSOFT.SQL"
| where Category == "QueryStoreRuntimeStatistics"
| summarize avg(avg_duration) by query_id
| top 10 by avg_duration desc
```
A
Identify queries consuming the most CPU.
Why wrong: No CPU metric in the query.
B
Identify the top 10 queries by average duration.
Averages avg_duration per query and returns top 10.
C
Identify queries with the highest total wait time.
Why wrong: Measures duration, not wait time.
D
Identify queries with the highest execution count.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Identify the top 10 queries by average duration.
The KQL query in the exhibit uses `summarize` with `avg(duration)` and then `top 10 by avg_duration`, which explicitly calculates the average duration per query_id and returns the top 10 queries with the highest average duration. This directly matches the purpose of identifying the top 10 queries by average duration.
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.
Averages avg_duration per query and returns top 10.
Related concept
Read the scenario before looking for a memorised answer.
✗
Identify queries with the highest total wait time.
Why it's wrong here
Measures duration, not wait time.
✗
Identify queries with the highest execution count.
Why it's wrong here
No aggregation on count.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'average duration' with 'total CPU consumption' or 'total wait time,' but the query explicitly uses `avg(duration)` and not `sum(cpu_time)` or `sum(wait_time)`, making the correct answer solely about average duration.
Detailed technical explanation
How to think about this question
The `duration` column in KQL typically represents the elapsed time of a query execution, which includes both CPU and wait components. By averaging this value per query_id, the query identifies queries that consistently take a long time to complete, which is a common starting point for performance tuning. In Azure Data Explorer or Azure Monitor Logs, this pattern helps distinguish between queries that are slow due to resource contention versus those that are inherently expensive in processing.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-300 question in full detail.
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: Identify the top 10 queries by average duration. — The KQL query in the exhibit uses `summarize` with `avg(duration)` and then `top 10 by avg_duration`, which explicitly calculates the average duration per query_id and returns the top 10 queries with the highest average duration. This directly matches the purpose of identifying the top 10 queries by average duration.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.