internet

Three - tier architecture builds on the traditional two-tier approach. The first tier is the client, the second tier is the web server and the third tier consists of the application s and their associated databases that supply non HTML information to the server on request. From software perspective three tiers are client processes, web services and data services. Interactions between the server and client operate in the same way as they do in the two-tier architecture. The third tier provides comprehensive data services including database operations supported by database software, enterprise resource planning software services and other services needed to support a robust e-commerce The client request is formulated into an HTTP message ,sent over the internet to the server and examined by the server. If analysis of the request reveals that the help of server’s database is required, then the server sends a request to the database to search and retrieve the required information. Database information flows back to the server and the server formats the response into properly formed HTML page and sends a message back to the client over the Internet

Hi Ponnamma: The use of the term "3-Tier architecture" can sometimes be confusing as it may mean different things to different people. I have come across two different meanings - one hardware oriented (physical), the other software oriented (logical). Go to this page and it will explain it more. It is too long to explain in this response. http://www.marston-home.demon.co.uk/Tony/uniface/3tierhardsoft.html Best of luck!