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3 tier architecture
This document discusses 3-tier architectures. It begins by defining a 3-tier architecture as one with a client, middle, and database tier. The client tier handles the user interface, the middle tier contains most of the logic and communication, and the database tier manages the database. It then discusses thin-client and thick-client 3-tier models and provides examples of each. The rest of the document explains the roles and examples of the presentation, application logic, and database tiers. It concludes by listing some advantages of 3-tier architectures such as independence of layers, easier maintenance, reusability, and faster development.
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3 tier architecture
- 2. Disclaimer: This presentationis prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
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- 6. 3-Tier Architectures • A3-tier architecture is one which has a client tier, a middle tier, and a database tier. – The database tier manages the database – The middle tier contains most of the logic and communicates between the other tiers – The client tier is the interface between the user and the system • An n-tier architecture is one which has n tiers, usually including a database tier, a client tier, and n-2 tiers in between. 6
- 8. Thin-Client 3-Tier Models •The thin-client 3-tier model has these tiers: – The database management system (DBMS) – The main application software – A web browser • Examples – http://ebay.com* 8
- 9. Thick-Client 3-Tier Models •The thick-client 3-tier model has these tiers: – The database management system (DBMS) – The main application software – Some sort of interface software which must be installed on each client machine • Examples: – Desktop applets that display weather, etc. 9
- 10. Tiers of anarchitecture Client browser <html> ... </html> Application logic tier information system Presentation tier Visualise Calculate Store Database tier 10
- 11. Presentation Tier • Providesuser interface • Handles the interaction with the user • Sometimes called the GUI or client view or front-end • Should not contain business logic or data access code • Example: – Systems accessed by web browsers using plain HTML documents 11
- 12. Application Logic Tier •The set of rules for processing information • Should not contain presentation or data access code • This tier is often referred to as – – – – Services Business logic Business rules Server 12
- 13. Database tier • • • • The physicalstorage layer for data Manages access to DB or file system Sometimes called back-end Should not contain presentation or business logic code
- 15. Advantages • • • • Independence of Layers Easierto maintain Components are reusable Faster development (division of work) Web designer does presentation Software engineer does logic DB admin does data model
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