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Data Import Modes

  • Explore Import, DirectQuery, and Live Connection modes in Power BI.

  • Import Mode

    What is Import Mode?

    In Import Mode, data is copied and stored inside Power BI file (.pbix).

    When you load data, Power BI stores it in its internal memory (VertiPaq engine).

    Data works offline after import.

    How It Works

    Database → Data copied → Stored in Power BI → Reports built on stored data

    Advantages

    Very Fast Performance
     Full DAX Support
     Works Offline
     Better for complex calculations
     Supports advanced modeling

    Disadvantages

    File size increases
    Needs scheduled refresh
    Not real-time (unless refreshed)

    Best Use Cases

    • Small to medium datasets

    • High-performance dashboards

    • Complex calculations

    • Training & demo projects

    👉 80% of real-world reports use Import Mode.


    DirectQuery Mode

    What is DirectQuery Mode?

    In DirectQuery Mode, data stays in the original source database.

    Power BI does NOT store data.
     It sends queries to the database every time user interacts with report.

    How It Works

    Report Interaction → Query sent to database → Database returns result → Visual updates

    Advantages

    Real-time data
     Small file size
     Suitable for very large datasets

    Disadvantages

    Slower performance
     Depends on database speed
     Limited DAX functions
     Limited modeling flexibility

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