Technical data

Enterprise Data Center Topology: J2EE Applications

Enterprise Topology Overview 1-3

Figure 1–1 Enterprise Data Center Topology: J2EE Applications

Single Sign On Middle Tier (Web Server Tier DMZ)

This tier is located just inside the outermost firewall. The load balancer gets requests

from external users and forwards them to the two sets of computers in this tier. For

each set of computers, you should have at least two computers, to serve as a backup

and also to improve performance. You can add more computers to each set as

necessary.

Internal users also access the Web servers running in this tier.

The computers in this tier run the following components:

■ One set of computers runs OracleAS Web Cache and Oracle HTTP Server.

This tier runs all the Web servers. Oracle HTTP Server and OracleAS Web Cache

handle requests for static objects and J2EE applications. They send the requests to

Load Balancer

J2EE (without Web Cache)

External Clients

Web Cache

Oracle HTTP Server,

including mod_oc4j

Customer

Database

Business Data

Web Server Tier DMZ

Oracle HTTP Server

for Single Sign-On and

Delegated Administration

Services

OC4J for Single Sign-On

and Delegated

Administration Services

Infrastructure DMZ

J2EE Business Logic DMZ

Intranet

J2EE

Firewall

Oracle Internet