DirectQuery vs Import mode in Power BI - Formula Comparison Trace

Sample Data

Comparison table showing key differences between Import and DirectQuery modes in Power BI.

Cell	Value
A1	Mode
B1	Data Storage
C1	Data Refresh
D1	Performance
E1	Data Size Limit
F1	Use Case
A2	Import
B2	Data is loaded and stored in Power BI
C2	Manual or scheduled refresh
D2	Fast, uses in-memory engine
E2	Limited by Power BI capacity
F2	When fast report response is needed
A3	DirectQuery
B3	Data stays in the source system
C3	Real-time or near real-time queries
D3	Depends on source system speed
E3	Limited by source system
F3	When data freshness is critical

Formula Trace

IF([Mode] = "Import", "Data is loaded and stored in Power BI", "Data stays in the source system")

Step 1: [Mode] = "Import"

Step 2: IF(TRUE, "Data is loaded and stored in Power BI", "Data stays in the source system")

Cell Reference Map

    A           B                              C                      D                  E                      F
1 | Mode      | Data Storage                 | Data Refresh          | Performance       | Data Size Limit       | Use Case
2 | Import    | Data is loaded and stored   | Manual or scheduled   | Fast, in-memory    | Limited by Power BI    | Fast report response
3 | DirectQuery| Data stays in the source   | Real-time queries     | Depends on source  | Limited by source      | Data freshness critical

Formula references cell A2 for Mode value.

The formula checks the Mode column in cell A2 to decide which description to show.

Result

    A           B
1 | Mode      | Data Storage
2 | Import    | Data is loaded and stored in Power BI
3 | DirectQuery| Data stays in the source system

The formula result in row 2 shows the description for Import mode based on the Mode value.

The result shows the data storage description for the Import mode in the table.

Sheet Trace Quiz - 3 Questions

What does the formula return when the Mode is 'Import'?

A Manual or scheduled refresh

B Data is loaded and stored in Power BI

C Data stays in the source system

D Real-time or near real-time queries

Key Result

IF(condition, value_if_true, value_if_false) chooses output based on a condition.

Practice

1. Which Power BI mode loads data into memory for faster report performance?

easy

A. Streaming mode

B. DirectQuery mode

C. Live Connection mode

D. Import mode

Solution

1. Step 1: Understand Import mode behavior

   Import mode loads data into Power BI's memory, enabling fast offline access.

2. Step 2: Compare with DirectQuery mode

   DirectQuery queries data live from the source, which can be slower due to network calls.

3. Final Answer:

   Import mode -> Option D

4. Quick Check:

   Import mode = loads data into memory [OK]

Hint: Import mode = data in memory for speed [OK]

Common Mistakes:

• Confusing DirectQuery as loading data into memory
• Thinking Live Connection is same as Import mode
• Assuming Streaming mode stores data in memory

2. Which of the following is the correct way to switch to DirectQuery mode when connecting to a SQL Server in Power BI?

easy

A. Choose 'DirectQuery' option during data source connection

B. Select 'Import' in the data source settings

C. Enable 'Live Connection' after loading data

D. Use 'Get Data' and then select 'Streaming dataset'

Solution

1. Step 1: Identify how to select connection mode

   When connecting to SQL Server, Power BI prompts to choose Import or DirectQuery mode.

2. Step 2: Confirm correct selection for DirectQuery

   Choosing 'DirectQuery' during connection enables live queries to the database.

3. Final Answer:

   Choose 'DirectQuery' option during data source connection -> Option A

4. Quick Check:

   DirectQuery selected at connection time [OK]

Hint: Pick DirectQuery option when connecting to data source [OK]

Common Mistakes:

• Selecting Import mode instead of DirectQuery
• Trying to enable DirectQuery after data load
• Confusing Live Connection with DirectQuery

3. Consider a Power BI report connected to a large sales database using DirectQuery mode. What is the expected behavior when a user filters the report by a specific product category?

medium

A. Power BI sends a live query to the database to fetch filtered data

B. The filter applies instantly using cached data in Power BI

C. The report crashes due to large data size

D. The filter does not work because DirectQuery does not support filtering

Solution

1. Step 1: Recall DirectQuery behavior on filtering

   DirectQuery mode sends queries live to the source database when filters change.

2. Step 2: Understand filtering effect

   Filtering triggers a new query to fetch only relevant data from the database.

3. Final Answer:

   Power BI sends a live query to the database to fetch filtered data -> Option A

4. Quick Check:

   DirectQuery filters trigger live queries [OK]

Hint: DirectQuery queries live on filter changes [OK]

Common Mistakes:

• Assuming filters use cached data in DirectQuery
• Believing DirectQuery disables filtering
• Thinking report crashes due to filtering

4. You created a Power BI report using Import mode but notice the data is outdated. What is the most likely cause and how to fix it?

medium

A. Data source is offline; switch to DirectQuery mode

B. Import mode does not support data refresh; use Live Connection

C. Data refresh is not scheduled; set up a refresh schedule

D. Report is corrupted; recreate the report

Solution

1. Step 1: Identify Import mode data update method

   Import mode loads data once and requires scheduled refresh to update data.

2. Step 2: Determine fix for outdated data

   Setting up a refresh schedule updates the imported data regularly.

3. Final Answer:

   Data refresh is not scheduled; set up a refresh schedule -> Option C

4. Quick Check:

   Import mode needs refresh schedule [OK]

Hint: Schedule refresh to update Import mode data [OK]

Common Mistakes:

• Thinking Import mode updates data automatically
• Confusing Import mode with DirectQuery refresh
• Assuming report corruption causes outdated data

5. A company has a very large dataset updated every minute and needs near real-time reports. Which Power BI mode should they choose and why?

hard

A. Import mode, because it provides the fastest report performance

B. DirectQuery mode, because it queries live data for up-to-date reports

C. Import mode, because it supports incremental refresh every minute

D. DirectQuery mode, because it caches data locally for faster access

Solution

1. Step 1: Analyze data size and update frequency

   Very large data updated every minute requires live querying to stay current.

2. Step 2: Match mode to requirements

   DirectQuery mode queries data live, providing near real-time updates without importing all data.

3. Final Answer:

   DirectQuery mode, because it queries live data for up-to-date reports -> Option B

4. Quick Check:

   Large, frequently updated data = DirectQuery [OK]

Hint: Use DirectQuery for large, frequently updated data [OK]

Common Mistakes:

• Choosing Import mode despite frequent updates
• Thinking incremental refresh updates every minute
• Believing DirectQuery caches data locally