Lecture 01 - Lecture 01 Comp355 Chapter 1: The Database...

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Lecture 01 Comp355
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Chapter 1: The Database Environment
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Definitions Data: Meaningful facts, text, graphics, images, sound, video segments Database: An organized collection of logically related data Information: Data processed to be useful in decision making Metadata: Data that describes data
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Figure 1-1a Data in Context Large volume of facts, difficult to  interpret or make decisions based  on
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Figure 1-1b Summarized data Useful information that managers can use for  decision making and interpretation
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Table 1-1 Metadata Descriptions of the properties or characteristics of the  data, including data types, field sizes, allowable values,  and documentation
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Disadvantages of File Processing Program-Data Dependence All programs maintain metadata for each file they use Data Redundancy (Duplication of data) Different systems/programs have separate copies of the same data Limited Data Sharing No centralized control of data Lengthy Development Times Programmers must design their own file formats Excessive Program Maintenance 80% of of information systems budget
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Figure 1-2 Three file processing systems at Pine Valley Furniture Duplicate Data
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Problems with Data Dependency Each application programmer must maintain their own data Each application program needs to include code for the metadata of each file Each application program must have its own
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This note was uploaded on 04/07/2008 for the course COMP 355 taught by Professor Wu during the Spring '08 term at Wentworth Institute of Technology.

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Lecture 01 - Lecture 01 Comp355 Chapter 1: The Database...

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