Single-Tier Architecture

Early we have discussed about the application architecture .On the basis of that we can explain what is single tier architecture?.In case of Single-tier architecture a single executable file handles all the functions relating to the user,business and data service layers.This is also called Monolithic application.

Some of early COBOL programs using this architecture.

Types of Application architectures

Applications are developed to support the organisations in their business operations.Application receives input and accept it and process the data based on business rules and provides data as output.The functions performed by an application can be classified into three types

1. User Service
2. Business Service
3. Data Service

• User Service

This is regarded as the front end of the solution.This is also called presentation layer because it provides interactive user interface.

• Business Service

It controls the enforcement of business rules of the data of an organisation. Business rules encircle those practices and activities that define the behaviour of an organisation. Eg: an organisation decides that the credit limit of all client cannot exceed $200000. Business service layer sets rules or validations to pertain these functions.This means the back end does not receive incorrect data

• Data Service

It comprises the data and functions for manipulating this data.

These three layer form the base of models or architecture used in application development in an organisation.Applications can be

• Single-tier architecture

• Two-tier architecture

• Three-tier architecture