Three tier architecture separates an application into three logical tiers - the presentation tier, logic tier, and data tier. It evolved from single tier architectures with all components on one machine to dual tier client-server models and finally three tier architecture. Three tier architecture offers advantages like scalability, reusability, improved security and data integrity by separating the user interface, business logic, and data access functions across multiple servers. It allows for more flexibility and growth than earlier architectures. While more complex to implement, it provides performance, manageability and security benefits over two tier architectures.

2. 3 Tier architecture
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3. MAIN POINTS
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•
•
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What is 3 tier architecture?
Evolution of 3 tier architecture
What does 3 tier architecture offers you
- advantages and disadvantages
Comparison with MVC

4. What is 3 tier architecture?
•
A three way interaction in a client server architecture
- The user interface stored in the client.
- The bulk of the business application logic stored in one or more
servers.
- The data stored in the database server.

6. Evolution to the 3 tier architecture
 Single tier
 Dual tier environments
 3 tier architecture

7. Single tier
 Time for huge main frames
 All processing in a single computer
 All resources attached to the same
computer
 Access via dumb terminals

8. Single tier…




Advantages
Simple
Efficient
Uncomplicated
 Disadvantages
 The cost of the central machine very expensive

9. Dual Tier environment
 Personal computers
 Necessity of providing
personal software
 The client server model was
born…

10. Dual tier environment..
 Logical system components –
Most which are on the client
 Advantages
• Easy to maintain and modification is bit
easy
• Communication is faster
 Disadvantages
• In two tier architecture application
performance will be degrade upon
increasing the users.
• Cost-ineffective

11. 3 tier architecture
 Involves one more layer called
business logic/middle layer.
 The client only displays GUI and
data, but has no part in producing
results.
• Less resources needed for client
workstation
• No client modification if database
location changes
• Less code to distribute to client
workstations
 One server handles many client
requests
• More resources available for server
program
• Reduces data traffic on the network

12. Benefits..

•
•


•
Scalability
The application servers can be deployed on many servers
The database no longer require a connection from every client.
Better Re-use
Improve data integrity
The middle tier can ensure that only valid data is allowed to be updated in the
database
 Improve security
• Since client doesn’t have direct access to the database
• Business logic is more secure since it placed on a more secure central layer
 Hidden database structure

13. Drawbacks
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Increased complexity/effort
Comparison with MVC
- In 3 tier; client tier never communicates directly with the data tier;
- In a three-tier model all communication must pass through the middle tier
- 3 tier is linear.
- MVC Architecture is triangular.
- The view sends updates to the controller,
the controller updates the model,
and the view gets updated directly from the model.

14. Thank you..

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