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Difference Between Two-Tier And Three-Tier database architecture
  • Difficulty Level : Easy
  • Last Updated : 17 Jun, 2020

1. Two-Tier Database Architecture –
In two-tier, the application logic is either buried inside the User Interface on the client or within the database on the server (or both). With two-tier client/server architectures, the user system interface is usually located in the user’s desktop environment and the database management services are usually in a server that is a more powerful machine that services many clients.

2. Three-Tier Database Architecture –
In three-tier, the application logic or process lives in the middle-tier, it is separated from the data and the user interface. Three-tier systems are more scalable, robust and flexible. In addition, they can integrate data from multiple sources. In the three-tier architecture, a middle tier was added between the user system interface client environment and the database management server environment. There are a variety of ways of implementing this middle tier, such as transaction processing monitors, message servers, or application servers.


Difference Between Two-Tier And Three-Tier Database Architecture

S.NOTwo-Tier Database ArchitectureThree-Tier Database Architecture
1It is a Client-Server Architecture.It is a Web-based application.
2In two-tier, the application logic is either buried inside the user interface on the client or within the database on the server (or both).In three-tier, the application logic or process resides in the middle-tier, it is separated from the data and the user interface.
3Two-tier architecture consists of two layers : Client Tier and Database (Data Tier).Three-tier architecture consists of three layers : Client Layer, Business Layer and Data Layer.
4It is easy to build and maintain.It is complex to build and maintain.
5Two-tier architecture runs slower.Three-tier architecture runs faster.
6It is less secured as client can communicate with database directly.It is secured as client is not allowed to communicate with database directly.
7It results in performance loss whenever the users increase rapidly.It results in performance loss whenever the system is run on Internet but gives more performance than two-tier architecture.
8Example – Contact Management System created using MS-Access or Railway Reservation System, etc.Example – Designing registration form which contains text box, label, button or a large website on the Internet, etc.

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