Chapter10 - Discovering Computers 2009 Chapter 10 Database...

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Unformatted text preview: Discovering Computers 2009 Chapter 10 Database Management Chapter 10 Objectives Discuss the functions common to most DBMSs Identify the qualities of valuable information Explain why data is important to an organization Discuss the terms character, field, record, and file Identify file maintenance techniques Differentiate between a file processing system approach and the database approach Describe characteristics of relational, object-oriented, and multidimensional databases Explain how to interact with Web databases Discuss the responsibilities of database analysts and administrators Next Define the term, database Add, change, and delete data Create databas e Sort and retrieve data Create forms and reports Data and Information What is a database ? p. 514 - 515 Next Database software allows you to Collection of data organized so you can access, retrieve, and use it Database software also called database management system (DBMS) Data and Information How are data and information related? p. 514 - 515 Fig. 10-1 Next Ø Data is a collection of unprocessed items Ø Information is data that is organized and meaningful Ø Computers process data into information Data and Information What is data integrity? p. 516 Next Ø Degree to which data is correct § Garbage in, garbage out (GIGO) —computer phrase that means you cannot create correct information from incorrect data Garbage out Garbage in Data integrity is lost Click to view Web Link, click Chapter 10, Click Web Link from left navigation, then click Data Security below Chapter 10 Data and Information What are the qualities of valuable information? p. 516 - 517 Next { 8 7 E 1 F A 9 -E 4 D A -4 9 C 9 -9 F 8-E 4 6 7 C 9 3 1 7 1 7 } Accurate { F C A B 8 9 6 0 -3 5 9 A -4 C E 2 -8 A C 4 -6 A 3 8 7 A 4 B 0 2 9 } Verifiable { E 6 C 0 9 8 E -A 0 3 8 -4 6 B 9 -9 7 9 7 -7 3 9 A 0 7 C 7 9 2 } Timely { A 8 E 6 5 F -C 8 0 D -4 E 7 8 -9 6 4 B -F 5 8 A 4 6 D 2 E 0 7 } Organized { 7 0 8 3 4 D 4 A -2 D 9 8 -4 8 7 B -8 E 1 4 -B 6 A 5 E 7 6 8 B 6 D B } Accessible { 2 F 7 6 2 E 6 D -4 E F E -4 A E D -8 9 A 0 -8 7 2 8 4 5 0 6 8 E 9 8 } Useful { C A D 8 D B 1 A -7 6 4 D -4 2 A 6 -A E 6-E F D 8 5 2 9 4 9 F 9 5 } Cost-effective The Hierarchy of Data What is a hierarchy? p. 517 Fig. 10-2 Next Ø Database contains files, file contains records, record contains fields, field contains characters The Hierarchy of Data What is a field ? p. 518 Fig. 10-3 Next Ø Combination of one or more characters Ø Smallest unit of data user accesses § Field name uniquely identifies each field § Field size defines the maximum number of characters a field can contain § Data type specifies kind of data field contains Yes/No (also called Boolean)— only the values Yes or No (or True or False) Hyperlink Web address that links to document or Web page Object (also called BLOB for binary large object)—photograph, audio, video, or document created in other application such as word processing or spreadsheet The Hierarchy of Data What are common data types?What are common data types?...
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This note was uploaded on 11/29/2009 for the course CSC CSC106 taught by Professor Cordle during the Spring '09 term at Sullivan.

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Chapter10 - Discovering Computers 2009 Chapter 10 Database...

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