By Scott W. Ambler
Refactoring has confirmed its price in quite a lot of improvement projects-helping software program pros enhance process designs, maintainability, extensibility, and function. Now, for the 1st time, prime agile methodologist Scott Ambler and well known advisor Pramodkumar Sadalage introduce strong refactoring strategies particularly designed for database systems.Ambler and Sadalage show how small adjustments to desk buildings, facts, saved techniques, and triggers can considerably improve nearly any database design-without altering semantics. you will how one can evolve database schemas consistent with resource code-and turn into way more powerful in tasks counting on iterative, agile methodologies.This complete advisor and reference is helping you triumph over the sensible hindrances to refactoring real-world databases through protecting each basic thought underlying database refactoring. utilizing start-to-finish examples, the authors stroll you thru refactoring basic standalone database functions in addition to refined multi-application eventualities. you are going to grasp each job taken with refactoring database schemas, and realize most sensible practices for deploying refactorings in even the main complicated creation environments.The moment half this booklet systematically covers 5 significant different types of database refactorings. you will the way to use refactoring to reinforce database constitution, information caliber, and referential integrity; and the way to refactor either architectures and techniques. This bookprovides an in depth set of examples outfitted with Oracle and Java and simply adaptable for different languages, resembling C#, C++, or VB.NET, and different databases, reminiscent of DB2, SQL Server, MySQL, and Sybase.Using this book's concepts and examples, you could lessen waste, remodel, danger, and cost-and construct database platforms able to evolving easily, a ways into the long run.
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Additional info for Refactoring Databases: Evolutionary Database Design
For example, it is time-consuming to search a table with millions of rows. You may want to split the table vertically by moving some columns into another table, or split it horizontally by moving some rows into another table. Both strategies reduce the size of the table, potentially improving performance. "Smart" columns. A smart column is one in which different positions within the data represent different concepts. For example, if the first four digits of the client ID indicate the client's home branch, then client ID is a smart column because you can parse it to discover more granular information (for example, home branch ID).
Although a lot of effort has been put into the development of object/relational (O/R) mapping tools, and some into database testing tools, there is still a lot of work to be done. Just like it took several years for programming tool vendors to implement refactoring functionality within their toolsin fact, now you would be hard pressed to find a modern integrated development environment (IDE) that does not offer such featuresit will take several years for database tool vendors to do the same. Clearly, a need exists for usable, flexible tools that enable evolutionary development of a database schemathe open source community is clearly starting to fill that gap, and we suspect that the commercial tool vendors will eventually do the same.
Columns often have default values defined for them. Are the default values actually being assigned? ) Data invariants. Columns often have invariants, implemented in the forms of constraints, defined for them. For example, a number column may be restricted to containing the values 1 through 7. These invariants should be tested. Database testing is new to many people, and as a result you are likely to face several challenges when adopting database refactoring as a development technique: Insufficient testing skills.