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Information Technology
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Server typesServer types& &
DatabaseDatabase
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Server TypesServer Types
Application Servers – also known as Middleware handles all application operations between users and a database
Audio/Video Servers –Enable Websites to broadcast streaming and multimedia content
Chat Servers – enable a large number of users to exchange information in an environment similar to Internet newsgroups that offer real-time discussion
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Server Types (cont.)Server Types (cont.)
Database Servers – server that performs tasks such as data analysis and storage
Fax Servers –Enables network to control incoming and outgoing telephone resources
Groupware Servers – enables users to use the internet or intranet to collaborate regardless of location in a virtual atmosphere
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Server Types (cont.)Server Types (cont.)
IRC Servers – Internet Relay Chat enables real-time discussion capabilities
List Servers – offers a better way to manage mailing lists, whether they be interactive discussions open to the public or one-way lists that deliver announcements, newsletters, or advertising
Mail Servers – move and store mail over corporate networks and across the Internet
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Server Types (cont.)Server Types (cont.) Name Servers – also known as DNS servers—
map the human-readable names to the IP addresses
News Servers – distribution and delivery source for the thousands of public news groups accessible over the USENET news network
Telnet Servers – allows users to log on to a host computer and perform tasks as if they’re working on the remote computer itself
Print Server- shares and maintains network printers, can join the domain server.
DATABASE: : ORGANIZED COLLECTION OF LOGICALLY RELATED DATADATA: : STORED REPRESENTATIONS OF MEANINGFUL OBJECTS AND EVENTSSTRUCTURED: : NUMBERS, TEXT, DATESUNSTRUCTURED: : IMAGES, VIDEO, DOCUMENTSINFORMATION: : DATA PROCESSED TO INCREASE KNOWLEDGE IN THE PERSON USING THE DATAMETADATA: : DATA THAT DESCRIBES THE PROPERTIES AND CONTEXT OF USER DATA
Definitions
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A SOFTWARE SYSTEM THAT IS USED TO CREATE, MAINTAIN, AND PROVIDE CONTROLLED ACCESS TO USER DATABASESADVANTAGES OF THE DATABASE APPROACHADVANTAGES OF THE DATABASE APPROACH1..PROGRAM-DATA INDEPENDENCE2.PLANNED DATA REDUNDANCY3.IMPROVED DATA CONSISTENCY4.IMPROVED DATA SHARING5.INCREASED APPLICATION DEVELOPMENT 6.PRODUCTIVITY7.ENFORCEMENT OF STANDARDS8.IMPROVED DATA QUALITY9.IMPROVED DATA ACCESSIBILITY AND RESPONSIVENESS10.REDUCED PROGRAM MAINTENANCE11.IMPROVED DECISION SUPPORT
Database Management System
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Costs and Risks of the Database Approach
1.New, specialized personnel2.Installation and management cost and complexity3.Conversion costs4.Need for explicit backup and recovery5.Organizational conflict
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Components of the Database Environment
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Components of the Database Environment
1.CASE Tools–computer-aided software engineering
2.Repository–centralized storehouse of metadata
3.Database Management System (DBMS) –software for managing the database
4.Database–storehouse of the data5.Application Programs–software using the
data6.User Interface–text and graphical displays to
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7.DATA/DATABASE ADMINISTRATORS–PERSONNEL RESPONSIBLE FOR MAINTAINING THE DATABASE
8.SYSTEM DEVELOPERS–PERSONNEL RESPONSIBLE FOR DESIGNING DATABASES AND SOFTWARE9.END USERS–PEOPLE WHO USE THE APPLICATIONS AND DATABASES
Components of the Database Environment
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The Range of Database Applications
Personal databasesWorkgroup databasesDepartmental/divisional databasesEnterprise database
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