Book Image

The Data Warehouse Toolkit - Third Edition

By : Ralph Kimball, Margy Ross
5 (1)
Book Image

The Data Warehouse Toolkit - Third Edition

5 (1)
By: Ralph Kimball, Margy Ross

Overview of this book

The volume of data continues to grow as warehouses are populated with increasingly atomic data and updated with greater frequency. Dimensional modeling has become the most widely accepted approach for presenting information in data warehouse and business intelligence (DW/BI) systems. The goal of this book is to provide a one-stop shop for dimensional modeling techniques. The book is authored by Ralph Kimball and Margy Ross, known worldwide as educators, consultants, and influential thought leaders in data warehousing and business intelligence. The book begins with a primer on data warehousing, business intelligence, and dimensional modeling, and you’ll explore more than 75-dimensional modeling techniques and patterns. Then you’ll understand dimension tables in-depth to get a good grip on retailing and moved towards the topics of inventory. Moving ahead, you’ll learn how to use this book for procurement, order management, accounting, customer relationship management, and many more business sectors. By the end of this book, you’ll be able to gather all the essential knowledge, practices, and patterns for designing dimensional models.
Table of Contents (31 chapters)
Free Chapter
1
Cover
2
Title Page
3
Copyright
4
About the Authors
5
Credits
6
Acknowledgements
29
Index
30
Advertisement
31
End User License Agreement

Employee Profile Tracking

Thus far the dimensional models we have designed closely resemble each other; the fact tables contain key performance metrics that typically can be added across all the dimensions. It is easy for dimensional modelers to get lulled into a kind of additive complacency. In most cases, this is exactly how it is supposed to work. However, with HR employee data, a robust employee dimension supports numerous metrics required by the business on its own.

To frame the problem with a business vignette, let’s assume you work in the HR department of a large enterprise. Each employee has a detailed HR profile with at least 100 attributes, including hire date, job grade, salary, review dates, review outcomes, vacation entitlement, organization, education, address, insurance plan, and many others. Employees are constantly hired, transferred, and promoted, as well as adjusting their profiles in a variety of ways.

A high-priority business requirement is to accurately track...