Saturday 30 December 2023

What are the different types of real-time data sets available in Power BI ?Power BI interview questions and answers 207

 What are the different types of real-time data sets available in Power BI ?

While Power BI doesn't have a specific dataset type labeled "real-time," it offers several ways to achieve real-time or near-real-time data experiences. Here are the key approaches:

1. DirectQuery:

  • Establishes a direct connection to a supported data source (e.g., Azure SQL Database, SSAS Tabular, SAP HANA).

  • When a report or visual is interacted with, Power BI retrieves data directly from the source instead of storing it in its own cache.

  • Offers near-real-time insights for smaller datasets with frequent updates, but may have performance limitations for large datasets or complex queries.

2. Live Connections:

  • Similar to DirectQuery, but with additional features like filtering and aggregation within Power BI.

  • May have slightly better performance than DirectQuery in some cases.

  • Not as widely supported as DirectQuery, limited to specific data sources.

3. Streaming Datasets:

  • Designed for continuous data streams (e.g., sensor readings, social media feeds, stock prices).

  • Power BI connects to a streaming data source and continuously updates visuals as new data arrives.

  • Requires specialized streaming connectors and additional setup (Azure Stream Analytics is often used).

  • Ideal for true real-time scenarios where immediate updates are crucial.

4. Push Data Sets:

  • External sources (e.g., Azure Stream Analytics, custom applications) can push data into Power BI in real-time using APIs.

  • Offers flexibility but requires technical knowledge and additional setup.

5. Scheduled Refresh with High Frequency:

  • Not strictly real-time, but can be effective for near-real-time scenarios with less frequent updates.

  • Set up automatic refreshes with very short intervals (e.g., every minute or few minutes).

  • Suitable for datasets that change quickly but not constantly, and where slight delays are acceptable.

Choosing the Right Approach:

  • Data update frequency: How often does your data change?

  • Data size and complexity: Can your infrastructure handle real-time processing?

  • Budget and technical expertise: Do you have the resources for streaming or push datasets?

  • Latency tolerance: How important is it to see updates immediately?

By carefully considering these factors, you can select the most appropriate approach to achieve real-time or near-real-time data experiences in Power BI, ensuring your reports and dashboards are always up-to-date with the latest information.

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