Oracle Architecture - 2

Oracle Server

The Oracle server can run on a number of different computers in one of the following ways:
• Client-Application Server-Server
• Client-Server
• Host-Based

Client-Application Server-Server:

(Three-tier) Users access the database from their personal computers (clients) through an application server, which is used for the application’s processing requirements.

Client-Server: 

(Two-tier) Users access the database from their personal computer (client) over a network, and the database sits on a separate computer (server).

Host-Based: 

Users are connected directly to the same computer on which the database resides.