Book Image

Pentaho Data Integration Beginner's Guide - Second Edition - Second Edition

By : María Carina Roldán
Book Image

Pentaho Data Integration Beginner's Guide - Second Edition - Second Edition

By: María Carina Roldán

Overview of this book

Capturing, manipulating, cleansing, transferring, and loading data effectively are the prime requirements in every IT organization. Achieving these tasks require people devoted to developing extensive software programs, or investing in ETL or data integration tools that can simplify this work. Pentaho Data Integration is a full-featured open source ETL solution that allows you to meet these requirements. Pentaho Data Integration has an intuitive, graphical, drag-and-drop design environment and its ETL capabilities are powerful. However, getting started with Pentaho Data Integration can be difficult or confusing. "Pentaho Data Integration Beginner's Guide - Second Edition" provides the guidance needed to overcome that difficulty, covering all the possible key features of Pentaho Data Integration. "Pentaho Data Integration Beginner's Guide - Second Edition" starts with the installation of Pentaho Data Integration software and then moves on to cover all the key Pentaho Data Integration concepts. Each chapter introduces new features, allowing you to gradually get involved with the tool. First, you will learn to do all kinds of data manipulation and work with plain files. Then, the book gives you a primer on databases and teaches you how to work with databases inside Pentaho Data Integration. Moreover, you will be introduced to data warehouse concepts and you will learn how to load data in a data warehouse. After that, you will learn to implement simple and complex processes. Finally, you will have the opportunity of applying and reinforcing all the learned concepts through the implementation of a simple datamart. With "Pentaho Data Integration Beginner's Guide - Second Edition", you will learn everything you need to know in order to meet your data manipulation requirements.
Table of Contents (26 chapters)
Pentaho Data Integration Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Best Practices
Index

Extending the sales datamart model


You may, and you usually have, more than one fact table sharing some of the dimensions.

Look at the following figure:

It shows two stars sharing three dimensions: Regions, Manufacturer, and Time. The star model to the left is the SALES star model you already know. The star model to the right does not have data for accessories but has more detail for puzzles, for example, the number of pieces they have or the category or theme they belong to. When you have more than one fact table sharing dimensions as here, you have what is called a constellation.

The following table summarizes the dimensions added to the datamart:

Dimension

Description

Pieces

Number of pieces of the puzzle, grouped in the following ranges: 0-25, 26-100, and so on

Theme

Classification of the puzzle in any of the following categories: Fantasy, Castles, Landscapes, and so on

Glows in the Dark

Yes/No

3D Puzzle

Yes/No

Wooden Puzzle

Yes/No

Panoramic Puzzle

Yes/No

Packaging

Number...