CLIENT SERVER ARCHITECTURE

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CLIENT SERVER ARCHITECTURE

• CSE 8343
• Prof. Dr. Mohamed Khalil
• By
• Anita Kanuganti
• Hemanth Raparthi

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Topics

• Introduction
• Overview Of Different Architectures
• Client/Server Architecture
• File Sharing Architecture
• Mainframe Architecture
• Examples of Client Server Architectures
• Two-tier Architecture
• Three-tier/Multi-tier Architecture
• Three-tier architecture with transaction
  processing monitor technology
• Three tier with an application server
• Three tier with message server
• Distributed /collaborative enterprise
  architecture
• Conclusions

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Main Frame architecture

• With Mainframe software architectures all
  intelligence is within the central host computer
• A limitation of mainframe software architectures
  is that they do not easily support graphical user
  interfaces or access to multiple databases from
  geographically dispersed sites

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File Sharing Architecture

• The original PC networks were based on file
  sharing architectures
• File sharing architectures work if shared usage
  is low, update contention is low, and the volume
  of data to be transferred is low

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Client/Server Architecture

• As a result of the limitations of file sharing
  architectures, the client/server architecture
  emerged
• A Database server replaced the File server
• Network traffic was reduced, because user queries
  could be answered directly.

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Types of Client/Server Architectures

• Two Tier Architecture
• Three Tier Architecture

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Two Tier Architecture

• Architecture
• User Interface (requester of services)
• Server Interface (provider of services)
• Advantages
• Improves Scalability

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Two-Tier Architecture cont.

• Non-Complex
• Non-time Critical information processing system
• User Interface in User side, database management
  in the server side

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Two Tier Architecture Cont.

• Disadvantages
• Performance Detoriats if more than 100 users are
  involved
• Interoperability is limited
• System Administration is difficult

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Usage of Two Tier Architecture

• Two tier software architectures are used
  extensively in non-time critical information
  processing
• This design is used frequently in decision
  support systems where the transaction load is
  light.
• The two tier architecture works well in
  relatively homogeneous environments with
  processing rules (business rules) that do not
  change very often and when workgroup size is
  expected to be fewer than 100 users, such as in
  small businesses.

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Three Tier Architecture

• Architecture
• Advantages
• It overcomes all the disadvantages of Two Tier
  Architecture, by providing a middle layer

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Three Tier Architecture cont.

• Disadvantages
• The development environment is more difficult to
  use, than the Two Tier development environment
• The cost involved is much more than the Two tier
  Architecture

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Three Tier Architecture cont.

• Usage of Three tier Architecture
• Used in distributed Client/Server Architecture.
  That provides flexibility,etc.
• Used in Internet applications
• Used in net-centric applications

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Different Implementations

• Three-tier architecture with transaction
  processing monitor technology
• The basic type of Three Tier Architecture
• The middle layer consists of Transaction
  Processing TP monitor technology.
• This focuses on the intelligence in the monitor

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Different Implementations cont.

• Three Tier with Message Server
• This consists of headers
• This focuses on Intelligent messages
• Good solutions for wire less infrastructure

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Different implementations cont

• Three tier with an Application Server
• Application Oriented
• Application runs on a shared environment
• Hence less security to worry about
• This architecture can be used, when Security,
  Scalability, Cost are the major considerations

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Different Implementations cont.

• Distributed /collaborative enterprise
  architecture
• An enterprise is defined , as a system comprised
  of multiple business systems or subsystems

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Conclusion

• Usage Considerations
• Cost Limitations
• Dependencies
• Alternatives
• Complementary Technologies

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Bibliography

• "Client/Server Computing--Architecture,
  Applications and Distributed Systems
  Management by Bruce Elbert, Bobby Martyna
• "Client/Server Architecture by Alex Berson
•   Dickman, A. "Two-Tier Versus Three-Tier Apps."
  InformationWeek 553 (November 13,
  1995) 74-80.
• Gallaugher, J. Ramanathan, S. "Choosing a
  Client/Server Architecture. A Comparison of
  Two-Tier and Three-Tier Systems." Information
  Systems Management Magazine 13, 2 (Spring 1996)
  7-13. 
• Edelstein, Herb. "Unraveling Client/Server
  Architecture." DBMS 7, 5 (May 1994) 34(7). 
• Newell, D. Jones, O. Machura, M.
  "Interoperable Object Models for Large Scale
  Distributed Systems," 30-31. Proceedings.
  International Seminar on Client/Server Computing.
  La Hulpe, Belgium, October 30-31, 1995. London,
  England IEE, 1995