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Refactoring has proven its value in a wide range of development projects–helping software professionals improve system designs, maintainability, extensibility, and performance. Now, for the first time, leading agile methodologist Scott Ambler and renowned consultant Pramodkumar Sadalage introduce powerful refactoring techniques specifically designed for database systems.
Ambler and Sadalage demonstrate how small changes to table structures, data, stored procedures, and triggers can significantly enhance virtually any database design–without changing semantics. You’ll learn how to evolve database schemas in step with source code–and become far more effective in projects relying on iterative, agile methodologies.
This comprehensive guide and reference helps you overcome the practical obstacles to refactoring real-world databases by covering every fundamental concept underlying database refactoring. Using start-to-finish examples, the authors walk you through refactoring simple standalone database applications as well as sophisticated multi-application scenarios. You’ll master every task involved in refactoring database schemas, and discover best practices for deploying refactorings in even the most complex production environments.
The second half of this book systematically covers five major categories of database refactorings. You’ll learn how to use refactoring to enhance database structure, data quality, and referential integrity; and how to refactor both architectures and methods. This book provides an extensive set of examples built with Oracle and Java and easily adaptable for other languages, such as C#, C++, or VB.NET, and other databases, such as DB2, SQL Server, MySQL, and Sybase.
Using this book’s techniques and examples, you can reduce waste, rework, risk, and cost–and build database systems capable of evolving smoothly, far into the future.
About the Authors xv
Chapter 1: Evolutionary Database Development 1
Chapter 2: Database Refactoring 13
Chapter 3: The Process of Database Refactoring 29
Chapter 4: Deploying into Production 49
Chapter 5: Database Refactoring Strategies 59
Chapter 6: Structural Refactorings 69
Chapter 7: Data Quality Refactorings 151
Chapter 8: Referential Integrity Refactorings 203
Chapter 9: Architectural Refactorings 231
Chapter 10: Method Refactorings 277
Chapter 11: Transformations 295
Appendix: The UML Data Modeling Notation 315
References and Recommended Reading 327