Post on 16-Nov-2014
description
Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
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3-Tier Architectures
SUHAIL K.Psuhailkp007@gmail.comwww.facebook.com/
suhilkp007twitter.com/suhilkp007in.linkedin.com/in/
suhailpallimalil+919633333583
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3-Tier Architectures• A 3-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.
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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*
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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.
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Tiers of an architecture
<html>...</html>
browser
Presentation tier
Application logic tier
Database tier
Client
info
rmat
ion
sys
tem
Visualise
Calculate
Store
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Presentation Tier
• Provides user 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
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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
Database tier
• The physical storage layer for data • Manages access to DB or file system • Sometimes called back-end • Should not contain presentation or business
logic code
Advantages
• Independence of Layers • Easier to 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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