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Import VS direct mode in Power BI

Capability

Import

DirectQuery

Size

Size limitation  Up to 1 GB per dataset

No limitation

Data Source

Combining Data from different sources

Cannot combine data from multiple sources

Performance

High-performance query engine

Depends on the data source response for each query

Data Change in the underlying data

Not Reflected. Required to do a Manual refresh in Power BI Desktop and republish the report or Schedule Refresh

Power BI caches the data for better performance. So, it is necessary to Refresh to ensure the latest data

Schedule Refresh

Maximum 8 schedules per day

Schedule often as every 15 mins

Power BI Gateway

Only required to get latest data from On-premise data sources

Must require to get data from On-premise data sources

Data Transformations

Supports all transformations

Supports many data transformations with some limitations

Data Modelling

No limitation

Some limitations

Built-in Date Hierarchy

Available

Not available

DAX expressions

Supports all DAX functions

Restricted to use complex DAX functions such as Time Intelligence functions.

Clustering

Available

Not available

Calculated Tables

Available

Not supported

Quick Insights

Available

Not available

Q&A

Available

Not available

Change Data Connectivity mode

Not possible to change Import to DirectQuery

Possible to change DirectQuery to Import

 

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