PL-900 Demonstrate the capabilities of Power BI Practice Question
This PL-900 practice question tests your understanding of demonstrate the capabilities of power bi. 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.
A data analyst notices that a Power BI report takes a long time to load when filtering by a specific date range. The data source is a SQL Server view that contains millions of rows. What is the most effective way to improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use DirectQuery and optimize the SQL view with indexes and filters
Option B is correct because the performance bottleneck is at the data source level—millions of rows in a SQL Server view. Using DirectQuery with optimized indexes and filters pushes query execution back to SQL Server, allowing it to leverage database-level performance features like index seeks and query plan caching. This reduces the amount of data transferred and processed in Power BI, directly addressing the root cause of slow filtering.
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.
✗
Create a calculated column for the date range filter
Why it's wrong here
Calculated columns are computed during load and do not help with filtering performance.
✓
Use DirectQuery and optimize the SQL view with indexes and filters
Why this is correct
DirectQuery with query folding pushes processing to the source, and indexes improve performance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Switch from DirectQuery to Import mode
Why it's wrong here
Import mode loads all data into memory, which may still be slow for millions of rows.
✗
Hide unnecessary columns in the report
Why it's wrong here
Hiding columns does not reduce data volume or query time.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Import mode is always faster for large datasets, but they overlook that DirectQuery with source-side optimization avoids transferring all data and leverages the database's native query processing power.
Detailed technical explanation
How to think about this question
Under the hood, DirectQuery translates Power BI filter operations into T-SQL queries sent to SQL Server. By optimizing the SQL view with appropriate indexes (e.g., covering indexes on date columns) and pushing filters into the view definition, the database engine can perform index seeks and reduce the number of rows scanned. In real-world scenarios, this approach is critical when dealing with large, frequently updated datasets where Import mode would cause long refresh times and memory pressure.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Demonstrate the capabilities of Power BI — This question tests Demonstrate the capabilities of Power BI — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use DirectQuery and optimize the SQL view with indexes and filters — Option B is correct because the performance bottleneck is at the data source level—millions of rows in a SQL Server view. Using DirectQuery with optimized indexes and filters pushes query execution back to SQL Server, allowing it to leverage database-level performance features like index seeks and query plan caching. This reduces the amount of data transferred and processed in Power BI, directly addressing the root cause of slow filtering.
What should I do if I get this PL-900 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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Question Discussion
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