Two-Tier and Three-Tier Architecture with example

In this article, we are going to discuss the two-tier and three-tier architecture.

Two-Tier Architecture

The two-tier architecture is like a client-server application. Direct communication takes place between the client and the server. There is no intermediate between client and server.

The above figure shows the architecture of the two-tier. Here the communication is one-to-one. Let us see the concept of two tiers with real-time application. For example, now we have a need to save the employee details in the database. The two tiers of two-tier architecture are,

1. Database (Data tier)
2. Client Application (Client tier)

So, in the client application, the client writes the program for saving the record in SQL Server and thereby saving the data in the database.

Advantages

1. Understanding and maintenance are easier.

Disadvantages

1. Performance will be reduced when there are more users.

Three-Tier Architecture

Three-tier architecture has three layers. They are,

1. Client layer
2. Business layer
3. Data layer

Client layer: Here we design the form using textbox, label, etc.

Business layer: It is the intermediate layer that has the functions for the client layer and it is used to make communication faster between client and data layer. It provides the business processes logic and the data access.

Data layer: it has the database.

Advantages

1. Easy to modify without affecting other modules
2. Fast communication
3. Performance will be good in a three-tier architecture.