The answer is DirectQuery mode, which is the correct choice for achieving near real-time data refresh in Power BI when you need updates every 30 minutes. DirectQuery works by sending live queries to the source database each time a report is opened or a visual is interacted with, rather than importing and storing a static copy of the data. This eliminates the latency inherent in import mode, where data is only refreshed on a scheduled basis, making DirectQuery ideal for scenarios requiring near real-time refresh without duplicating data. On the PL-300 exam, this question tests your understanding of connectivity modes and their refresh behaviors—a common trap is choosing Import mode with a 30-minute scheduled refresh, but that still relies on a pre-loaded snapshot, not true live access. Remember the tip: if the data must stay in the source and refresh every 30 minutes, think "DirectQuery for direct access."
PL-300 Prepare the data Practice Question
This PL-300 practice question tests your understanding of prepare 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 preparing data for a report that needs to be refreshed every 30 minutes to meet near real-time requirements. Which Power BI feature should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use DirectQuery mode to connect to the source database.
DirectQuery mode allows Power BI to query the source database directly without importing data, enabling near real-time refreshes by executing queries against the source every time a report is interacted with or when the dataset is refreshed. This meets the 30-minute refresh requirement without the latency of data import, as the data remains in the source and is not copied into Power BI.
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.
✓
Use DirectQuery mode to connect to the source database.
Why this is correct
DirectQuery queries the source on each interaction, providing near real-time data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Import data and schedule refresh every 30 minutes.
Why it's wrong here
Pro license only allows 8 daily refreshes; Premium allows 48, but still not true real-time.
✗
Use a streaming dataset with real-time data.
Why it's wrong here
Streaming is for sensor data, not for database queries.
✗
Use a push dataset to send data from the source.
Why it's wrong here
Push datasets require an external process to push data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'near real-time' with 'real-time' and choose streaming or push datasets, but the question specifies a 30-minute refresh interval, which aligns with DirectQuery's scheduled refresh capability rather than continuous data ingestion.
Detailed technical explanation
How to think about this question
DirectQuery translates Power BI DAX queries into native SQL queries sent to the source database, leveraging the database's indexing and query optimization for performance. However, it imposes limitations such as no support for calculated tables, time intelligence functions, or data transformations in Power Query, and it requires the source to handle query load efficiently. In a real-world scenario, if the source database is a SQL Server with high concurrency, DirectQuery can provide near real-time data without duplicating storage, but it may degrade performance if complex measures are used.
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.
Prepare the data — This question tests Prepare the data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use DirectQuery mode to connect to the source database. — DirectQuery mode allows Power BI to query the source database directly without importing data, enabling near real-time refreshes by executing queries against the source every time a report is interacted with or when the dataset is refreshed. This meets the 30-minute refresh requirement without the latency of data import, as the data remains in the source and is not copied into Power BI.
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.
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Question Discussion
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