IT Architecture

Contents:- IT Architecture Types

1^st Tier Architecture

In 1st-tier architecture there is only one database server and others are clients.

Business logic and database are into the database server.

All clients are thin client means they have only harware i.e CPU,motherboard,memory,mouse etc.. here to access business logic all clients have to connect to database server.

Problem:- whenever client encreases then we have to increase server also because of work-load.

2nd Tier Architecture

In 2-tier architecture client is not thin client. here business logic(software) is located in client computer and database is located into the database server.

Problem:- change-management-system not supported in 2-tier architecture. means business logic(software) needs to update oftenly so whenever we make change into business logic(software) then we have to install or update business logic(software) into all client computer. so here this is the problem.

3^rd Tier Architecture  

In this

Client computer             -        Contain only browser

Application server         -        Contain business logic

Database server             -        Contain Database

Change-management-system supported in 3-tier architecture because for making change we have to change only in application server..

Note:- Oracle's first application server is 9

Nth Tier Architecture

In this architecture there are multiple application server and database server for load-balancing.