By Rod Stephens
Nearly all of software program purposes use relational databases that almost each program developer needs to paintings with. This e-book introduces you to database layout, no matter if you're a DBA or database developer. You'll realize what databases are, their pursuits, and why right layout is important to accomplish these targets. also, you'll grasp find out how to constitution the database so it provides reliable functionality whereas minimizing the opportunity for errors. you'll find out how to make a decision what may be in a database to fulfill the application's standards.
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Perhaps you decide that you need to track customers’ dining habits so you know what restaurant gift certificate to give them on special occasions. In this case, it would be nice if you could extend the database design to hold this extra information. Good database design can make this kind of extension possible. Ease of Use Notebooks and filing cabinets have simple user interfaces so almost anyone can use them effectively. (Although sometimes even they get messed up pretty badly. ’’) A computer application’s user interface determines how usable it is by average users.
Building a useful database can be a lot of work but there’s no reason it can’t be interesting and useful to you when you’re finished. Early in your reading, pick some sort of database that you would find useful (see the previous section for a few ideas) and think about it as you read through the text. When the book talks about creating an initial design, sketch out a design for your database. tex V3 - 10/01/2008 3:41am Introduction how to normalize a database, normalize yours. As you work through the exercises, think about how they would apply to your dream database.
Consistency ensures that the transaction will not complete if it would leave the database in a state that violates the database’s rules. Durability means that the database will not later decide that the transaction caused such a state and retroactively remove the transaction. Once the transaction is committed, it is final. A high-end database might provide durability through continuous shadowing. Every time a database operation occurs, it is shadowed to another system. If the main system crashes, the shadow database can spring instantly into service.
Beginning Database Design Solutions by Rod Stephens