1 tier, 2 tier & 3 tier architecture

1 tier, 2 tier & 3 tier architecture

In multitier architecture (i.e. client server architecture) , presentation, application processing and information management(i.e. Data management) are logically different processes.

3 Tier Architecture

In 3 tier architecture, application is divided into three parts which resides on three different machines.

First tier will be user interface i.e. the presentation tier. It communicates with other tiers in order to display information to client.

Second will be business logic tier known as middle tier, it will control the application by processing the business logic.

And third will be the database tier.

This tier consists of database servers where info is stored and retrieved.

this tier will be handling database related queries .

2 Tier Architecture

In this architecture an application is broken down in two roles which are played by two different machines commonly a client and a server. In this architecture, business logic can reside on either client machine or server machine. If Business logic resides on server than server is called Fat server because it will be managing database related and business logic related queries and in other case if business logic resides on client machine then machine is called Fat Client because in this case client machine has to deal with client related and Business logic related queries.

1 Tier Architecture

In this architecture, all the processing is done on single machine i.e. every tier resides on single machine.which can be a mainframe and are accessed by dumb terminals.