The answer is that some DAX functions are not supported. This is correct because DirectQuery mode does not import data into Power BI; instead, it translates report interactions into native queries sent directly to the source system, such as SQL Server or Oracle, each time a visual is rendered. Since the engine cannot rely on an in-memory cache, many time-intelligence functions and complex iterator patterns that require multiple passes over data are simply unavailable or behave differently. On the PL-300 exam, this topic tests your understanding of when to choose DirectQuery over Import mode, and a common trap is assuming all DAX works identically across both modes. Remember that DirectQuery prioritizes real-time data freshness over performance and function richness. A helpful memory tip: if a DAX function needs to “see” the entire table in memory (like DATESBETWEEN or TOTALYTD), it likely won’t work in DirectQuery—think “no cache, no complex time travel.”
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.
Which THREE of the following are valid considerations when using Power BI DirectQuery mode?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Queries are sent to the underlying data source in real time.
Option C is correct because in DirectQuery mode, Power BI does not import data; instead, it sends native queries to the underlying data source (e.g., SQL Server, Oracle) each time a visual is rendered or a filter is applied. This ensures that the data displayed is always current, as the query is executed in real time against the source system.
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.
✗
Data is imported into the Power BI dataset.
Why it's wrong here
Import mode imports data; DirectQuery does not.
✗
You cannot create relationships between tables.
Why it's wrong here
Relationships can be created, but they rely on the source.
✓
Queries are sent to the underlying data source in real time.
Why this is correct
DirectQuery does not import data; it queries the source.
Related concept
Read the scenario before looking for a memorised answer.
✓
Row-level security (RLS) can be applied.
Why this is correct
RLS is supported in DirectQuery mode.
Related concept
Read the scenario before looking for a memorised answer.
✓
Some DAX functions are not supported.
Why this is correct
Time intelligence functions are often not supported.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse DirectQuery with Import mode, assuming data is still cached locally, or mistakenly think relationships cannot be created because they are not enforced at the dataset level, when in fact they are supported but with limitations.
Detailed technical explanation
How to think about this question
Under the hood, DirectQuery translates Power BI DAX and report interactions into native SQL queries (or equivalent for other sources) and sends them to the source via the appropriate provider (e.g., ADO.NET for SQL Server). A subtle behavior is that certain DAX functions, like time intelligence functions (e.g., TOTALYTD), may not be supported because they require a date table with a continuous date range, which DirectQuery cannot guarantee without additional configuration. In a real-world scenario, a financial dashboard needing up-to-the-minute sales data would use DirectQuery to avoid stale data, but must carefully design measures to avoid performance degradation from complex queries.
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.
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: Queries are sent to the underlying data source in real time. — Option C is correct because in DirectQuery mode, Power BI does not import data; instead, it sends native queries to the underlying data source (e.g., SQL Server, Oracle) each time a visual is rendered or a filter is applied. This ensures that the data displayed is always current, as the query is executed in real time against the source system.
What should I do if I get this PL-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 PL-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 PL-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.