By Mike Morrison; Joline Morrison
ISBN-10: 0619216298
ISBN-13: 9780619216290
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Extra info for Guide to Oracle10g
Example text
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. 1, Panel A, shows the Web survey form that enables users to respond to your questions.
A key characteristic of knowledge is that “new” knowledge can be derived from “old” knowledge. Let’s summarize some key points: ¼ Data constitute the building blocks of information. ¼ Information is produced by processing data. ¼ Information is used to reveal the meaning of data. ¼ Accurate, relevant, and timely information is the key to good decision making. ¼ Good decision making is the key to organizational survival in a global environment. Timely and useful information requires accurate data.
Data storage management is also important for database performance tuning. Performance tuning relates to the activities that make the database perform more efficiently in terms of storage and access speed. Although the user sees the database as a single data storage unit, the DBMS actually stores the database in multiple physical data files. ) Such data files may even be stored on different storage media. Therefore, the DBMS doesn’t have to wait for one disk request to finish before the next one starts.
Guide to Oracle10g by Mike Morrison; Joline Morrison
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