3tier architecture

2. 3 Tier architecture
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3. MAIN POINTS
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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…
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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..
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•
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
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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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