Book Image

Oracle Warehouse Builder 11g: Getting Started

By : Bob Griesemer
Book Image

Oracle Warehouse Builder 11g: Getting Started

By: Bob Griesemer

Overview of this book

In today's economy, businesses and IT professionals cannot afford to lag behind the latest technologies. Data warehousing is a critical area to the success of many enterprises, and Oracle Warehouse Builder is a powerful tool for building data warehouses. It comes free with the latest version of the Oracle database. Written in an accessible, informative, and focused manner, this book will teach you to use Oracle Warehouse Builder to build your data warehouse. Covering warehouse design, the import of source data, the ETL cycle and more, this book will have you up and running in next to no time. This book will walk you through the complete process of planning, building, and deploying a data warehouse using Oracle Warehouse Builder. By the book's end, you will have built your own data warehouse from scratch. Starting with the installation of the Oracle Database and Warehouse Builder software, this book then covers the analysis of source data, designing a data warehouse, and extracting, transforming, and loading data from the source system into the data warehouse. You'll follow the whole process with detailed screenshots of key steps along the way, alongside numerous tips and hints not covered by the official documentation.
Table of Contents (15 chapters)
Oracle Warehouse Builder 11 Getting Started
About the Author
About the Reviewers

Chapter 5. Extract, Transform, and Load Basics

We're moving along nicely into the process of designing and building a data warehouse. If you've been reading all the way through to here, you'll recall how we've introduced the Warehouse Builder software (how to install it along with the Oracle Database), looked at its architecture, and covered a short overview of the analysis and design phases for implementing a data warehouse project. We've defined our data sources and imported the metadata for them. We've designed our target structure into which we'll load the data. Congratulations for having read this far—don't give up now because we're not done yet. We still have to get data from our sources into our target. We will do that by:

  1. Designing mappings in OWB.

  2. Deploying the mappings to the database.

  3. Running the mappings.

This chapter will expose ETL (Extract, Transform, and Load) for the first time in this book. ETL is the first step in building the mappings from source to target. We have sources...