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  • Book Overview & Buying Creating your MySQL Database: Practical Design Tips and Techniques
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Creating your MySQL Database: Practical Design Tips and Techniques

Creating your MySQL Database: Practical Design Tips and Techniques

By : Delisle
3.5 (2)
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Creating your MySQL Database: Practical Design Tips and Techniques

Creating your MySQL Database: Practical Design Tips and Techniques

3.5 (2)
By: Delisle
Buy this Book

Overview of this book

For most of us, setting up the database for an application is often an afterthought. While you don't need to be a professional database designer to create a working application, knowing a few insider tips and techniques can make both the process easier and the end result much more effective. This book doesn't set out to make you an expert in data analysis, but it does provide a quick and easy way to raise your game in this essential part of getting your application right.
Table of Contents (12 chapters)
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Creating your MySQL Database: Practical Design Tips and Techniques
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Creating your MySQL Database: Practical Design Tips and Techniques
Credits
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Credits
About the Author
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About the Author
About the Reviewer
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About the Reviewer
Preface
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Preface
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1
Introducing MySQL Design
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Introducing MySQL Design
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MySQL's Popularity and Impact
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Data as a Resource
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Data Modeling
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Case Study
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The Tale of the Too Wide Table
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Summary
2
Data Collecting
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Data Collecting
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System Boundaries Identification
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Document Gathering
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Interviews
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Data Collected for our Case Study
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Summary
3
Data Naming
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Data Naming
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Data Cleaning
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Subdividing Data Elements
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Data that are Results
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Data as a Column's or Table's Name
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Planning for Changes
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Naming Recommendations
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Summary
4
Data Grouping
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Data Grouping
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Initial List of Tables
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Rules for Table Layout
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Improving the Structure
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Validating the Structure
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Summary
5
Data Structure Tuning
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Data Structure Tuning
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Data Access Policies
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Storage Engines
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Performance
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In-Column Data Encoding
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Case Study's Final Structure
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Summary
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Supplemental Case Study
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Supplemental Case Study
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Results from the Document Gathering Phase
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Preliminary List of Data Elements
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Tables and Sample Values
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Airline System Data Schema
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Sample Queries
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Summary
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Index
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Index

Planning for Changes

When designing a data structure, we have to think about how to manage its growth and the possible implications of the chosen technique.

Let's say an unplanned car characteristic—the weight—has to be supported. The normal way of solving this is to find the proper table and add a column. Indeed, this is the best solution; however, someone has to alter the table's structure, and probably the UI too.

The free fields technique, also called second-level data or EAV (Entity-Attribute-Value) technique is sometimes used in this case. To summarize this technique, we use a column whose value is a column name by itself.

Note

Even if this technique is shown here, I do not recommend using it, for the reasons explained in the Pitfalls of the Free Fields Technique section below.

The difference between this technique and our car_event table is that, for car_event, the various attributes can all be related to a common subject, which is the event. On the contrary, free fields can store any...

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