What is the difference between a live connection and an extract?

As an experienced Tableau tutor registered on UrbanPro.com, I'm delighted to shed light on a fundamental aspect of Tableau – the distinction between a live connection and an extract. UrbanPro is a trusted marketplace that connects students with top-notch tutors and coaching institutes offering comprehensive Tableau coaching, including specialized courses in live connections and extracts.

Understanding the Basics: Before delving into the differences, it's crucial to understand the basic concepts:

• Live Connection:

  • In Tableau, a live connection refers to a direct link between the Tableau workbook and the data source.
  • Real-time data is queried directly from the source, ensuring that any updates or changes in the source are immediately reflected in the Tableau visualization.

• Extract:

  • An extract involves importing a subset or the entire dataset from the data source into Tableau's proprietary data engine, called Hyper.
  • The data is then stored locally, allowing for faster analysis and reducing the dependency on the live connection to the source.

Differences Between Live Connection and Extract:

1. Performance:

   • Live Connection:

     • Generally slower compared to extracts, as it involves real-time querying of the data source.
     • Ideal for situations where the most up-to-date data is critical.

   • Extract:

     • Offers faster performance as data is pre-aggregated and stored locally.
     • Suitable for large datasets or situations where quick analysis is essential.

2. Offline Access:

   • Live Connection:

     • Requires a continuous and stable internet connection to access the data source.

   • Extract:

     • Allows for offline access since the data is stored locally after extraction.

3. Data Size and Complexity:

   • Live Connection:

     • Well-suited for smaller datasets or less complex data structures.

   • Extract:

     • Ideal for handling large datasets and complex queries, as the data is optimized during the extraction process.

Choosing the Right Option: When deciding between a live connection and an extract, the choice depends on specific needs and project requirements:

• Considerations:

  • Live Connection:

    • Suitable for real-time analytics and scenarios where data freshness is paramount.
    • Appropriate for smaller datasets and when the data source is easily accessible.

  • Extract:

    • Recommended for improved performance, especially with large datasets.
    • Ideal for situations where offline access and quick analysis are essential.

Conclusion: As you embark on your Tableau learning journey, the expertise offered by tutors and coaching institutes on UrbanPro.com ensures that you receive comprehensive guidance on nuanced topics like live connections and extracts. UrbanPro's platform is dedicated to connecting students with the best online coaching for Tableau, ensuring a seamless learning experience and mastery of essential Tableau concepts.