Question 1

When should you prefer Import Mode over DirectQuery in Power BI?

Accepted Answer

When your data fits into memory and you want high performance for analytics.

Answer

When you only want a real-time connection to an on-premises server.

Answer

When the data comes from a flat file source.

Answer

When your data is too large to fit in memory but needs real-time updates.

Question 2

A company needs to analyze large datasets without performance concerns. Which storage mode is most appropriate?

Accepted Answer

DirectQuery Mode because it queries data directly from the source in real-time.

Answer

Import Mode because it provides faster querying performance for large datasets.

Answer

Import Mode because it always works with datasets of any size.

Answer

Live Connection because it imports the data into memory before analysis.

Question 3

Which limitation would you encounter while using DirectQuery Mode in Power BI?

Accepted Answer

Slower performance due to real-time querying of data from the source.

Answer

Data is not refreshed in real-time, limiting dynamic reporting.

Answer

Unable to access SQL Server Analysis Services for real-time data connections.

Answer

Requires all data to be stored in memory before it can be accessed or queried.

Question 4

Your organization needs to use SQL Server Analysis Services (SSAS) for real-time analytics. Which mode is best?

Accepted Answer

Live Connection Mode because it allows real-time connections to SSAS.

Answer

Import Mode because it enables the highest performance for SSAS connections.

Answer

DirectQuery Mode because it queries SSAS data without importing it.

Answer

DirectQuery Mode because it automatically refreshes data from SSAS in Power BI.

Question 5

A business user notices slower performance in reports using DirectQuery. What could be causing this issue?

Accepted Answer

Queries are being run in real-time, which can slow down response times.

Answer

The dataset is too large to fit in memory, causing Power BI to slow down.

Answer

The report is connected via Import Mode, causing too many data loads.

Answer

Power BI is trying to store all the data in memory for faster access.

Question 6

How does Live Connection Mode differ from DirectQuery Mode in Power BI?

Accepted Answer

Live Connection is used for SSAS or Azure Analysis Services, offering real-time updates.

Answer

DirectQuery Mode loads the entire dataset into memory for fast reporting performance.

Answer

Live Connection is only used for importing flat files, not real-time connections.

Answer

DirectQuery Mode requires data to be preloaded into memory before querying.

Question 7

A team needs real-time analytics but also wants to avoid loading large datasets into memory. Which mode to use?

Accepted Answer

DirectQuery Mode because it doesn’t require data to be loaded into memory.

Answer

Import Mode because it loads the entire dataset into memory for fast performance.

Answer

Import Mode because it supports real-time analytics without memory limitations.

Answer

Live Connection because it only works for preloaded datasets in memory.

Question 8

What is a major disadvantage of using Import Mode in Power BI for large datasets?

Accepted Answer

It can consume significant memory and lead to performance issues with very large datasets.

Answer

Queries are run in real-time, causing delays in reporting for large datasets.

Answer

Data updates are always real-time, slowing down large dataset analysis.

Answer

It requires continuous connections to the data source for real-time analysis.

Question 9

You are working with on-premises SQL Server Analysis Services. Which mode is ideal?

Accepted Answer

Live Connection Mode because it directly connects to SSAS without importing data.

Answer

DirectQuery Mode because it provides real-time querying from SQL Server.

Answer

Import Mode because it supports on-premises SSAS with memory-based queries.

Answer

Import Mode because it allows fast querying for SSAS data in Power BI reports.

Question 10

How can you improve performance in Power BI when using DirectQuery Mode with slow queries?

Accepted Answer

Optimize the underlying data source for faster query execution.

Answer

Increase the size of memory in Power BI to speed up the real-time queries.

Answer

Switch to Import Mode to avoid real-time querying delays.

Answer

Enable Live Connection Mode to reduce the number of queries being executed.

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