Middle Ware Technologies

Types Of Servers

1. File Server

Any  server access the repository for same server is called file server.

Client  ------>File Calls  -------->File Sever
          <------------Files--------->  

Examples:

Document files, Image Files, Audio Files...etc

2. Database Server

Any server used  to access Data base data is called Database server.

Client-------------->SQL Calls-------------------->DBServer
          <------------------Data--------------------->

Examples:

MS-Access
Oracle
SQLServer

3. Transaction Server

Group of SQL statements are called transaction. Transaction server is a repository of remote procedures.

They are

1. Transaction Lite
2. Transaction Heavy

Client -------------->Remote Procedure------------------>Transaction Server

4. Groupware Server

It is a repository of text

Example

Lotus Nodes

Client ------------>Group Ware Messages ------------>Group Server

5. Object Servers

It interacts with ORB(Object Request Broker).

Client ----ORB------->RMI-------ORB---->OS

Example:

1. Hp's ORB Plus

2. Express

3. Microsoft's Dcom

6. Web Server

WWW is a software it contains web servers.

Client -----------> HTTP Over TCP/IP--------> Web Server ------CGI------>Data server

1. Fat Client

Client Knows about server to access the functionalities.

*  File Server and Database server are called Fat Client

2. Fat Servers

Client doesn't know about servers.

* Groupware Server, Web Server, Transaction Server are called Fat Servers.

* Object server is combination of both fat client and server.