Systems analysis and development CIS210 ch 14

CIS 210
Systems Analysis
and Development
Week 8 Part II
Designing Distributed
and Internet Systems


Objectives
• Upon completion of part II you will be able to:
– Understand and be able to explain the concepts related to
client server architecture, local area networking, distributed
databases and middleware
– Understand and be able to explain the concepts related to file
server and client server environments
– Understand and be able to explain the concepts related to
distributed systems and their trade-offs
– Understand and be able to explain the concepts related to web
site management and customer loyalty and trustworthiness
– Understand and be able to explain the concepts related to
online data, transaction processing, analytical processing and
data warehousing


Overview
• Advances in Technology
– GUIs
– Networking
– Internet

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Opportunities
Competitive Pressures
Technologies Being Used
Capabilities and Issues


Designing Distributed
and Internet Systems
• The Process of Designing Distributed and
Internet Systems
– More design issues
– More components

• Deliverables and Outcomes
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Description
Data usage
Business processes
Contrasts of alternative IS architectures


Designing

Distributed Systems
• Designing Systems for LANs
– Local area network
– File servers
• Manages file operations
• Limitations
– Excessive data movement
– The need for a powerful client workstation
– Decentralized data control


Designing
Distributed Systems
• Designing Systems for Client/Server Architecture
– Client
• Managing the user interface

– Server
• Database storage
• Access

– Benefits
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Benefits leverage
Reduced response time and network traffic
GUI techniques

Open systems


Designing
Distributed Systems
• Choosing Between File Server and Client/Server
– Client/server
• Supports distribution of data
• Supports distribution of processing

• Advanced Forms of Client/Server Architectures
– Functions
• Data management
• Data presentation
• Data analysis

– Three tiered client/server
– Middleware


Designing
Internet Systems
• Internet Design Fundamentals
– Standards drive the Internet
• BIND
• HTTP
• HTML

– Separating content and display
• XML

– Future evolution
• Thin client
• Wireless
– WAP
– WML


Designing
Internet Systems
• Site Consistency
– Cascading style sheets
• Simplify site maintenance
• Ensure consistency

– Extensible style language
• Separating style from content
• Methods for transforming
• Methods for formatting

– Other consistency issues
• Page and link titles
– Unique titles
– Choose words carefully


Designing
Internet Systems
• Design Issues Related to Site Management
– Customer loyalty and trustworthiness

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Design quality
Disclosure
Comprehensive, correct, current
Connected to the Web

– Personalization
– Customization
– Web pages must live forever
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Bookmarks
Links from other sites
Search engines
Added value

– System security
• Striking a balance


Designing
Internet Systems
• Managing Online Data

– Context development
• Integration depth
• Organizational breadth

– Online transaction processing
– Online analytical processing
– Data warehousing
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Subject oriented
Integrated
Time-variant
Non-volatile

– Enterprise data warehouse
– Data marts


Summary
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Process of designing distributed and Internet systems
Designing systems for LANs
Designing systems for client/server architecture
Choosing between file/server and client/server
architecture
Internet design fundamentals
Providing site consistency
Internet system design issues
Managing online data