3 tier architecture

1. 3 Tier Architecture

2. Software Components
•We are in to building complex software applications and as you are
well aware most of the software will have a
–User interface (UI)
»Is what a user sees and interact with. Eg: GUI
–Business logic
»On which the programming logic has been build.Eg: Reports
–Backend
»Mechanism to store data permanently. Eg: Database

3. Software Architecture
•In order to achieve maintainability, Scalability and security we
may need to separate those components in to different layers and
tiers and there comes the relevance of software architecture
•Software architecture is the Process of defining a structured
solution that meets all of the technical and operational
requirements.

4. 1-Tier Architecture
•Code for all the required component to run the application are
coupled tightly together.
•Ie. User interface, business logic, and data storage are all located
without any logical and physical separation
«Eg: MS Excel,

5. •Advantages
–Simple
–Easy to design
•Disadvantages
–Difficult for multiple users ie.Not Scalable
–Because they are not part of a network, they are useless for designing
web applications.
1-Tier Architecture

6. 2-Tier Architecture
•All the required component to run the application are coupled
within client and server.
Client Applications
Database Server
Client
Presentation + Business Logic
Server
Database
Client
Presentation
Server
Database + Business Logic
OR

7. Client Applications
2-Tier Architecture
Database Server
Select * from tbl_cutomer
Some application developed
in java/c++/.NET and installed
on clients computer

8. Points to be noted
•It is possible to implementthe 2 tire architecture in a single
system as well. I.e. it’s not necessary to be in a client server model
always
•The only thing is that there should be a logical separation between
databaseand presentationwith business logic coupled with any of
the other two layers
•By doing so, software installation will also includes installation of
the database

9. •Advantages
–Simple to implement compared to 3 -tier
–Easy to use
•Disadvantages
–Performance will be degrade upon increasing the users, since the
database server has to handle the business logic
–If client beholds most of the application logic, problems arise in
controlling the software version and re-distributing of new versions.
–Any change in an application should reflect all clients. If higher number
of users exists in the system
2-Tier Architecture

10. •All the required component to run the application are logically
separated ( and hence can be physical)
3-Tier Architecture
Client Browser –eg:Chrome
Presentation
Web Server Eg:Apache,IIS
Business Logic
Database Server Eg:Mysql
Backend

11. •
Returns data
Request from
Presentation layer
Apply business logic
on the data
1
2
4
3
Connect with database
server
5
WebServer
Processed data to be
disaplyedin browser
Browser Database Server
Working of 3-Tier architecture

12. •Advantages
–Scalability –Each tier can scale horizontally
–Better Re-use
–Easy to maintain and modification is bit easy, won’t affect other
modules
•Disadvantages
–Increase Complexity/Effort
3-Tier Architecture

13. Points to be noted
•It is also possible to implementthe 3 tire architecture in a single
system as well. I.e. it’s not necessary to be in a client server model
always
•The only thing is that there should be a logical separation between
databaseand presentationand business logic

14. Questions?
“A good question deserve a good grade…”

15. Self Check !!

16. End of day

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