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

Chapter 5, Controlling the Flow of Data


Pop quiz – deciding between a Number range step and a Switch/Case step

Q1

3

The answer is 3, as both 1 and 2 solve the situation. You can use a Number range step that maps the number of people that speak the language to the number of interpreters. Then you can Switch/Case based on the number of interpreters. This would be option 1. Alternatively, you can use just a Switch/Case step based not on the number of interpreters but on the number of people. This would be option 2.

Pop quiz – understanding the difference between copying and distributing

Q1

3

In the second transformation the rows are copied, so all the unassigned rows reach the dummy step. In the first transformation, the rows are distributed, half of the rows arrive at the filter step. When you do the preview, you see only the unassigned tasks for this half; you don't see the unassigned tasks that went to the other stream.

Option 3 may be true depending in the data and depending on how the data is distributed