This document presents an overview of 3-tier architecture. It introduces software components and the different tiers of architecture. The 3 tiers are the presentation layer, application layer, and resource management layer. The presentation layer handles the user interface, the application layer contains business logic and calculations, and the resource management layer deals with different data sources and is implemented using a database management system. Advantages of 3-tier architecture include scalability and flexibility, while disadvantages include potential performance losses when distributed over the internet and costs associated with integrating different 3-tier systems.

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3-TIER
ARCHITECTURE

3. Disclaimer: This presentation is 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

4. INTRODUCTION
SOFTWARE COMPONENTS
TIERS OF ARCHITECTURE

5. INTRODUCTION
ARCHITECTURE
The style and
method of design
and construction.
SYSTEM
Group of
interrelated elements
forming a collective
entity.

6. SOFTWARE COMPONENTS
USER INTERFACE
BUSINESS LOGIC
BACKEND

7. PRESENTATION LAYER
Allows users to interact with the
system.
Implemented as GUI interface.
Defines how data should appear to
the user & how user interact with
the interface.

8. APPLICATION LAYER
Does more than information
delivery.
Performs data processing-
Business Logic & calculation.

9. RESOURCE MANAGEMENT
LAYER
Deals with and implements
different data sources of
Information System.
Referred to as Data layer
Implemented using Database
Management System.

10. TIERS OF ARCHITECTURE
1 TIER ARCHITECTURE
2 TIER ARCHITECTURE
3 TIER ARCHITECTURE

11. 1-TIER ARCHITECTURE
Presentation
layer
UI
Application
layer
BUSINESS
LOGIC
Resource
management
layer
BACKEND
Information
system
Presentation, application
logic, and resource
management are merged
into a single tier.
Monolithic Information
systems
Eg: MS Excel

12. ADVANTAGES AND DISADVANTAGES OF 1 TIER
ARCHITECTURE
ADVANTAGES:
Easy to optimise performance.
No context switching
DISADVANTAGES:
Monolithic –high maintenance.
Not scalable
Hard to modify.

13. 2-TIER ARCHITECTURE
USER
INTERFACE
BUSINESS
LOGIC DATABASE
SERVER
CLIENT CLIENT SERVER
Architecture
The business Logic either
merges with UI to form the
Client, or
The Business Logic
combines with Data layer to
form the Server.

14. SERVER
Business Logic
CLIENT
2-TIER ARCHITECTURE
USER INTERFACE

15. ADVANTAGES AND DISADVANTAGES OF 2-TIER
ARCHITECTURE
ADVANTAGES:
Easy to use
Simple compared to 3-Tier.
DISADVANTAGES:
Performance degrades when users increase.
Problems arise when client beholds most
application logic.

16. 3 –TIER ARCHITECTURE
UI
BUSINESS
LOGIC
User Interface,
Business Logic and
Database Server
are separated.

17. EXAMPLE
USER REQUESTS FOR
WITHDRAWAL
REQUESTS FOR USER’S
BALANCE
DATABASE RETURNS FOR
REQUEST
WITHDRWAL DONE
DATA STORAGE SPACE
USER INTERFACE
BUSINESS LOGICS AND
CALCULATIONS APPLIED HERE

18. ADVANTAGES AND DISADVANTAGES OF 3-TIER
ARCHITECTURE
ADVANTAGES:
SCALABILITY
FLEXIBILITY
DISADVANTAGES:
PERFORMANCE LOSS WHEN DISTRIBUTED OVER
INTERNET
COST ISSUES ON INTEGRATING DIFFERENT 3TIER
SYSTEMS

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