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3 tier architecture
This document discusses different software architecture tiers - 1-tier, 2-tier, and 3-tier architectures. 1-tier architecture has all components tightly coupled together with no separation. 2-tier architecture separates components into client and server but business logic remains coupled to either presentation or data. 3-tier architecture fully separates presentation, business logic, and data layers, allowing each tier to scale independently for improved performance, reusability, and maintainability compared to 1-tier and 2-tier architectures.
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3 tier architecture
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- 2. Software Components • Weare 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 • Inorder 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 • Codefor 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 • Allthe 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 DatabaseServer Select * from tbl_cutomer Some application developed in java/c++/.NET and installed on clients computer
- 8. Points to benoted • It is possible to implement the 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 database and presentation with business logic coupled with any of the other two layers • By doing so, software installation will also includes installation of the database
- 9. • Advantages – Simpleto 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 therequired 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 Presentationlayer Apply business logic on the data 1 2 4 3 Connect with database server 5 WebServer Processed data to be disaplyed in 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 benoted • It is also possible to implement the 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 database and presentation and business logic
- 14. Questions? “A good questiondeserve a good grade…”
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