Book Image

Expert Data Modeling with Power BI - Second Edition

By : Soheil Bakhshi
4 (1)
Book Image

Expert Data Modeling with Power BI - Second Edition

4 (1)
By: Soheil Bakhshi

Overview of this book

This book is a comprehensive guide to understanding the ins and outs of data modeling and how to create full-fledged data models using Power BI confidently. In this new, fully updated edition, you'll learn how to connect data from multiple sources, understand data, define and manage relationships between data, and shape data models to gain deep and detailed insights about your organization. As you advance through the chapters, the book will demonstrate how to prepare efficient data models in the Power Query Editor and use simpler DAX code with new data modeling features. You'll explore how to use the various data modeling and navigation techniques and perform custom calculations using the modeling features with the help of real-world examples. Finally, you'll learn how to use some new and advanced modeling features to enhance your data models to carry out a wide variety of complex tasks. Additionally, you'll learn valuable best practices and explore common data modeling complications and the solutions to supercharge the process of creating a data model in Power BI and build better-performing data models. By the end of this Power BI book, you'll have gained the skills you need to structure data coming from multiple sources in different ways to create optimized data models that support high-performing reports and data analytics.
Table of Contents (22 chapters)
1
Section I: Data Modeling in Power BI
4
Section II: Data Preparation in Query Editor
10
Section III: Data Modeling
13
Section IV: Advanced Data Modeling
20
Other Books You May Enjoy
21
Index

Understanding dataset storage modes

As you may have already guessed, dataset storage modes refer to whether the data in a dataset is cached in memory or not. With that in mind, from a dataset perspective, there are three different modes, as outlined next:

  • Import: When the whole data is cached in memory. In this mode, all tables are in the Import storage mode setting.
  • DirectQuery: When the data is not cached in memory. In this mode, all tables are in the DirectQuery storage mode setting.
  • Composite (Mixed): When a portion of data is cached in memory, while the rest is not. In this mode, some tables are in the Import storage mode setting; other tables are in DirectQuery storage mode or the Dual storage mode setting.

To see and edit the dataset storage modes in Power BI Desktop, look at the right side of the status bar, as shown in the following image:

Graphical user interface  Description automatically generated with medium confidence

Figure 4.59: Identifying dataset storage modes in Power BI Desktop

Dataset storage mode is...