Gerald V Post's Database Management Systems Designing & Building Business PDF

By Gerald V Post

In today’s more and more decentralized and insecure enterprise enviornment, powerful database administration has taken on an entire new urgency. Database administration platforms, 3rd Edition, introduces and explains center strategies of database layout, improvement, and management. certain sections display the way to first review protection threats after which layout very important defense elements and combine them into every one software. utilized routines and circumstances carry proof and knowledge into the genuine world.

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Extra resources for Database Management Systems Designing & Building Business Applications

Sample text

Codd originated the relational database approach in the 1970s, and within several years three elements came together to make the relational database the predominant method for storing data. First, theoreticians defined the basic concepts and illustrated the advantages. Second, programmers who built database management system software created efficient components. Third, hardware performance improved to handle the increased demands of the system. 18 illustrates how the four basic tables in the example are represented in a relational database.

There are exceptions to this idealistic portrayal. Obviously, if you delete entire chunks of the database structure, some of your applications are not going to work properly. Similarly, if you make radical changes to the data definitions—such as changing phone number data storage from a numeric to a text data type—you will probably have to alter your reports and forms. However, a properly designed database rarely needs these radical changes. Consider the problem of adding cell phone numbers to an Employee table.

However, if you need to share a database with dozens of other students, you might be denied the ability to perform some tasks, such as deleting data or tables. The challenge is even greater in Chapter 10. If you are serious about learning database administration tasks, you will need to install your own copy of the DBMS so that you have complete access and the ability to alter detailed elements. Advantages of the Database Management System Approach What are the advantages of using a database management system?

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Database Management Systems Designing & Building Business Applications by Gerald V Post

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