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Steve Hoberman - Data Model Scorecard: Applying the Industry Standard on Data Model Quality

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Steve Hoberman Data Model Scorecard: Applying the Industry Standard on Data Model Quality
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Data models are the main medium used to communicate data requirements from business to IT, and within IT from analysts, modelers, and architects, to database designers and developers. Therefore its essential to get the data model right. But how do you determine right? Thats where the Data Model Scorecard comes in.
The Data Model Scorecard is a data model quality scoring tool containing ten categories aimed at improving the quality of your organizations data models. Many of my consulting assignments are dedicated to applying the Data Model Scorecard to my clients data models - I will show you how to apply the Scorecard in this book.
This book, written for people who build, use, or review data models, contains the Data Model Scorecard template and an explanation along with many examples of each of the ten Scorecard categories. There are three sections: In Section I, Data Modeling and the Need for Validation, receive a short data modeling primer in Chapter 1, understand why it is important to get the data model right in Chapter 2, and learn about the Data Model Scorecard in Chapter 3. In Section II, Data Model Scorecard Categories, we will explain each of the ten categories of the Data Model Scorecard. There are ten chapters in this section, each chapter dedicated to a specific Scorecard category:
  • Chapter 4: Correctness
  • Chapter 5: Completeness
  • Chapter 6: Scheme
  • Chapter 7: Structure
  • Chapter 8: Abstraction
  • Chapter 9: Standards
  • Chapter 10: Readability
  • Chapter 11: Definitions
  • Chapter 12: Consistency
  • Chapter 13: Data
In Section III, Validating Data Models, we will prepare for the model review (Chapter 14), cover tips to help during the model review (Chapter 15), and then review a data model based upon an actual project (Chapter 16).

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Applying the Industry Standard on Data Model Quality first edition - photo 1

Applying the

Industry Standard on

Data Model Quality

first edition

Steve Hoberman

Published by:

2 Lindsley Road Basking Ridge NJ 07920 USA httpswwwTechnicsPubcom Cover - photo 2

2 Lindsley Road

Basking Ridge, NJ 07920 USA

https://www.TechnicsPub.com

Cover design by Mark Brye

Technical reviews by Clifford Heath and R. Raymond McGirt

Edited by Erin Elizabeth Long

All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without written permission from the publisher, except for the inclusion of brief quotations in a review.

The author and publisher have taken care in the preparation of this book, but make no expressed or implied warranty of any kind and assume no responsibility for errors or omissions. No liability is assumed for incidental or consequential damages in connection with or arising out of the use of the information or programs contained herein.

All of the data models that appear in this book were created using the Embarcadero ER/Studio Data Architect tool, for more information on ER/Studio visit http://www.embarcadero.com/data-modeling.

Embarcadero, the Embarcadero Technologies logos, and all other Embarcadero Technologies product or service names are trademarks or registered trademarks of Embarcadero Technologies, Inc. Data Model Scorecard is a registered trademark of Steve Hoberman & Associates, LLC. All other trademarks are property of their respective owners and should be treated as such.

Copyright 2015 by Technics Publications, LLC

ISBN, print ed. 9781634620826

ISBN, Kindle ed. 9781634620833

ISBN, ePub ed. 9781634620840

ISBN, PDF ed. 9781634620857

First Printing 2015

Library of Congress Control Number: 2015910688

Contents at a Glance - photo 3

Contents at a Glance Table of Contents - photo 4

Contents at a Glance

Table of Contents Introduction Data modeling is the - photo 5

Table of Contents

Introduction Data modeling is the process of discovering analyzing - photo 6

Introduction

Data modeling is the process of discovering, analyzing, and scoping data requirements and then representing these data requirements in a visual format called the data model. A data model is a set of symbols and text used for communicating a precise representation of an information landscape. As with a model of any landscape, such as a map that models a geographic landscape, certain content is included and certain content excluded to facilitate understanding.

Discovering involves determining what information the business needs in its business processes and/or applications such as learning that Customer and Account are important concepts. Analyzing involves clarifying requirements such as coming up with clear definitions for Customer and Account and understanding the relationship between customers and their accounts. Scoping involves working with the business to determine what is most important for a particular project phase such as whether we need both Savings and Checking Accounts or just Checking Accounts for Phase 1. Representing means displaying what the information landscape looks like using an unambiguous precise language such as in the following data model:

Each Customer may own one or many Accounts Each Account must be owned by one - photo 7

  • Each Customer may own one or many Accounts .
  • Each Account must be owned by one or many Customers .

Once we document these requirements on the data model, we can then communicate them to business and information technology (IT) players involved in application development such as business users, business analysts, data modelers, data architects, database administrators, developers, testers, and managers.

Data models are the main medium used to communicate data requirements from business to IT, and within IT from analysts, modelers, and architects to database designers and developers. Regardless of whether the underlying database technology is a Relational Database Management System (RDBMS) such as Oracle or Teradata, or a NoSQL database such as MongoDB or Hadoop, we still need a way to communicate data requirements. Therefore, we need data models!

Our data models need to be of high quality to support current requirements yet also gracefully accommodate future requirements. The Data Model Scorecard is a tool you can use to improve the quality of your organizations data models.

Many of my consulting assignments are dedicated to applying the Data Model Scorecard to my clients data models and making recommendations to improve the design. This book will show you how to apply the Data Model Scorecard. This book is written for people who build, use, or review data models. There are three sections.

In .

In , we will explore each of the ten categories of the Data Model Scorecard. There are ten chapters in this section, each chapter dedicated to a specific Scorecard category:

  • Chapter 4: Correctness
  • Chapter 5: Completeness
  • Chapter 6: Scheme
  • Chapter 7: Structure
  • Chapter 8: Abstraction
  • Chapter 9: Standards
  • Chapter 10: Readability
  • Chapter 11: Definitions
  • Chapter 12: Consistency
  • Chapter 13: Data

Each of these chapters ends with a summary of that categorys checks.

In ).

All of the data models that appear in this book were created using the Embarcadero ER/Studio Data Architect tool. For more information on ER/Studio, visit http://www.embarcadero.com/data-modeling. You can download a free trial of the tool at http://www.embarcadero.com/downloads.

Section I Data Modeling and the Need for Validation In this - photo 8

Section I
Data Modeling and the Need for Validation

In this section you will receive a short data modeling primer in - photo 9

In this section you will receive a short data modeling primer in .

Chapter 1 Data Modeling Primer This chapter will provide a brief - photo 10

Chapter 1
Data Modeling Primer

This chapter will provide a brief overview of data model components including how to read a data model. For more content, please refer to my book Data Modeling Made Simple .

Entities

An entity represents a collection of information about something that the business deems important and worthy of capture. Each entity is identified by a noun or noun phrase, and it fits into one of six categories: who, what, when, where, why, or how. Here is a definition of each of these entity categories along with examples:

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