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By Carlos Coronel, Steven Morris, Peter Rob
DATABASE structures: layout, IMPLEMENTATION, AND administration, 9th variation, a market-leader for database texts, supplies readers a superb origin in functional database layout and implementation. The ebook presents in-depth insurance of database layout, demonstrating that the main to winning database implementation is in right layout of databases to slot inside of a bigger strategic view of the information surroundings. -Updated insurance of knowledge versions. -Improved assurance of normalization with an information modeling list. -Enhanced assurance of of database layout and lifestyles cycle. -New assessment questions, challenge units, and situations during the booklet. With a robust hands-on part that incorporates real-world examples and routines, this ebook might help scholars enhance database layout abilities that experience useful and significant program within the actual global.
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Thus, it is important that you know the difference between data and information. 2 DATA VS. INFORMATION To understand what drives database design, you must understand the difference between data and information. Data are raw facts. The word raw indicates that the facts have not yet been processed to reveal their meaning. For example, suppose that you want to know what the users of a computer lab think of its services. Typically, you would begin by surveying users to assess the computer lab’s performance.
They graciously accepted the fact that during more than a year’s worth of rewriting, there would be no free weekends, rare free nights, and even rarer free days. We owe you much, and the dedication we wrote to you is but a small reflection of the important space you occupy in our hearts. Yet, until the late 1970s, databases stored large amounts of data in a hierarchical structure that was difficult to navigate and inflexible. Programmers needed to know what clients wanted to do with the data before the database was designed.
2 DBMS Functions A DBMS performs several important functions that guarantee the integrity and consistency of the data in the database. Most of those functions are transparent to end users, and most can be achieved only through the use of a DBMS. They include data dictionary management, data storage management, data transformation and presentation, security management, multiuser access control, backup and recovery management, data integrity management, database access languages and application programming interfaces, and database communication interfaces.