Tier II and Tier III Architectures–Efficient way to build web applications

This article will deal with some introduction to web application and extensive knowledge on the working of two and three tier web applications to retain your site at the top.

Before starting with this article, I want to you to know the purpose of this article. This is not written to give you some piece of general information about web application developers. There have been many articles written to serve you with the importance of web application development. However, my research says that there have been very few to bring you the awareness about the type of web application you must use to retain that top position in the search engines and to retain your viewers to you site.

Introduction to Web applications

Web applications are a computer based software hosted on a browser-controlled environment. The reason for popularity of a web application development company is because we you don’t need to install software on thousands of computers, however, without installation thousands of computers can run the particular software via internet/intranet through their web-browsers. Custom web application development has been around since the web gained mainstream popularity. Larry Wall developed Perl, a popular server-side scripting language, in 1987.

However, the actual pick of web applications started after the adoption of internet world over in the fields other than academic and technology. Web Application Developers, India gained fast-track attention in late 90’s.

Web application types: Tier II and Tier III Architecture

Keeping in mind the business needs, web applications have been divided in tier II and tier III architectures.

Tier II architecture actually consists of:

  • Data server: The database serves the data based on SQL queries submitted by the application.
  • Client application: The application on the client computer that consumes the data and presents it in the readable format.

Tier II architecture is very simple to implement. In fact most of the applications are developed using tier II architecture. A client application is simply binded with the data server to submit and retrieve data from the database and show it on the client to the user. This can be better understood by an example.

For example, suppose a small scale restaurant wants to keep track of about 100 customers eating at their place. In this case the software that will be build would be simply using tier II architecture of a client and a data server where in when a manager fires a database query using client as user interface, the query would be processed at the data server and would be returned to client to show the results.

This operation takes hardly few seconds or rather fraction of seconds if you have an effective technology used for development.

Performance: Because of tight-coupling a two tier would run faster. There is not as much configuration required thereby making code deployment and server maintenance slightly easier.

Tier III:

Clearly, Tier III architecture is suitable for large organization, why and how? You will need to buy servers that should be powerful enough to run both the web and the application incase you have a huge increase in your user base. However in the three tiered system, you can scale your architecture based on what your system does and on where your check point is.

Again, all of this can be simplified with an example, tier III consists of:

Client: front-end Business logic: Middle layer Database: backend

For Example, In case you have a bigger hotel now that serves around 1000’s of people in a day, obviously you need a bigger architecture. Imagine using the same old 2 tier system, it will take longer time to process your data as database has become larger now. And if during that time other users hit your site, they will receive extremely poor response, due to which, you site can come down tremendously. Therefore, we use three-tier architecture. Now, if a manager fires query, it works simply works from client to application server, application server to data server, back to application and to client.

Performance: Although, it looks like a lengthy process, it takes hardly some seconds to actually display the result. Instead of serving up an entire recordset, which has to be passed over a network, the server application is serving up a tiny amount of network traffic.


This article will deal with some introduction to web application and extensive knowledge on the working of two and three tier web applications to retain your site at the top.

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