The answer is to use Power BI Performance Analyzer to capture query performance for each user role and analyze the generated DAX queries in DAX Studio. This is the correct first step because RLS performance troubleshooting requires isolating whether the static role filters are causing query slowdowns; Performance Analyzer records the exact DAX queries sent to the model per user, and DAX Studio reveals how those queries are executed, including filter propagation and storage engine bottlenecks. On the PL-300 exam, this scenario tests your understanding that RLS performance issues are diagnosed at the query level, not by blindly switching to dynamic roles or rebuilding the model—a common trap is assuming dynamic RLS is always faster when in fact static roles can be optimized once the slow queries are identified. Remember the memory tip: "Profile first, optimize second"—always capture the actual query behavior before making structural changes.
PL-300 Model the data Practice Question
This PL-300 practice question tests your understanding of model the data. 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 are a Power BI administrator for a large enterprise. You have a Power BI semantic model that uses a single large fact table named Sales (100 million rows) and several dimension tables. The model is used by multiple departments, each with different row-level security (RLS) rules based on the SalesRegion column. You have implemented RLS using static roles. However, you notice that when users from different departments view the same report page, the query performance varies significantly. You suspect that the RLS filters are causing the performance difference. You need to investigate and optimize the RLS performance. What should you do first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Power BI Performance Analyzer to capture query performance for each user role and analyze the generated DAX queries in DAX Studio.
Option A is correct: using Performance Analyzer and DAX Studio can identify which queries are slow and whether RLS is the cause. Option B would not help directly. Option C is a possible optimization but not the first step. Option D is wrong because dynamic RLS is not necessarily faster.
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.
✗
Increase the data model's memory limit in Premium capacity.
Why it's wrong here
This might help but does not address the root cause.
✓
Use Power BI Performance Analyzer to capture query performance for each user role and analyze the generated DAX queries in DAX Studio.
Why this is correct
This identifies the specific queries and their performance, helping pinpoint RLS impact.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Convert all RLS roles to use dynamic RLS with USERPRINCIPALNAME.
Why it's wrong here
Dynamic RLS may not necessarily be faster; it depends on implementation.
✗
Remove all RLS roles and implement security at the report level using bookmarks.
Why it's wrong here
This bypasses RLS entirely and is not a proper solution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which PL-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.
Model the data — This question tests Model the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Power BI Performance Analyzer to capture query performance for each user role and analyze the generated DAX queries in DAX Studio. — Option A is correct: using Performance Analyzer and DAX Studio can identify which queries are slow and whether RLS is the cause. Option B would not help directly. Option C is a possible optimization but not the first step. Option D is wrong because dynamic RLS is not necessarily faster.
What should I do if I get this PL-300 question wrong?
Identify which PL-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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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