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Oracle Application Architecture

Tata Consultancy Services -May 2000

Release 11 Architecture -NCA

? Uses Java based interface
? Graphical client -server software without installing
oracle applications in each Java enabled desktop

? NCA vs Smart Client
In SC model application software installed on
desktop and servers
In NCA application software is downloaded
through a JAVA applet.

05/22/12 Tata Consultancy Services

Different Layers-3 tier Architecture

Tata Consultancy Services

Desktop Client Tier


Desktop Client Tier

? Runs a Java Applet using a Java enabled web browser or
applet viewer
? Sends request to the Forms Server and handles responses
such as screen updates ,pop-up lists ,cursor movements etc
? The desktop clients Java applet is a component of Oracle
D2K development tool and is called the Forms client applet

? Utilities
? Can display any Oracle application Screen
? Support field level validation
? Multiple co-ordinated windows
? Data entry aids like LOV��S


JAVA ARCHIVES

? To ensure rapid startup and keep network traffic light , the
forms client applet is packaged as few java archive files or
JAR files.
? JAR files contain all the JAVA classes that are typically
required.
? JAR files for the forms clients applet use a digital signature
to guarantee their authenticity to the desktop client.


Application Tier


Application Tier
The Application server forms the middle tier between the
desktop client and the database server.
Provides
? Load Balancing
? Business Logic
? Other Functionalities

Mainly consists of
�� Forms Server
�� Web Server


Forms Server
? Specific type of Application server that hosts the Oracle
Forms server Engine.
? Displays client screens and causes changes to the database
according to user request.
? Data is also cached in the forms server and is provided when
needed. e,g Scrolling through a multiple orders line
Load Balancing Server
? Release 11 automatically provides a load balancing among
multiple application servers.
? Metrics Server on one application server co ordinates the
load balancing among application servers.


Web Server

? Runs the HTTP listeners.
? Accepts incoming HTTP requests (or URLs) from desktop
clients.

How does the Forms server and the Web server work?
Submit a request to the Web server for the initial
signon HTML.The page is returned along with Forms client
applet which in turn connects the forms server using TCP/IP.
From this point on the client applet is connected directly with
the forms server.


Web Server Architecture

1 2 3

n Listeners ORB ORB
n Dispatchers WRB Cartridge
VPM Factory
Auth wrbfac Universal
Broker Oracle
Provider n Cartridges Server
Logger ORB

Client

ORB APP
Dispatcher WRB API
Adapter WRBX
Listener ICX


Web Server Architecture

The Web Application Server Consists of the following
components:
? HTTP Daemons (Unix) or Listeners
? Web Request Broker
? Cartridge or Server-Side Applications


Listeners

? Listens to request from clients
? Uses HTTP to communicate with the clients
? Can accept connections from one or more IP address/port
combinations.
? Web servers from Netscape or Microsoft can also be used
as the listener component.


Web Request Broker (WRB)

WRB keeps track of the execution of the entire system.
Tasks performed are
* Load balancing tasks.
* Tracking of global resources.
* Obtains address of the required cartridge
resource.


System Services provided by WRB

?Virtual Path Manager (VPM) - Maps virtual paths with
cartridge types.
? Authentication Server - Authenticates Clients.
? Logger Service - Logs requests and messages in a file or
database.
? Configuration provider - Reads and stores information from
the configuration file.
? Intercartridge Exchange (ICX) -allows application to
communicate with each other.


? Transaction Service - enables to perform transaction
that spans request on a database.
? Content Services - enables to save documents in
repositories.


Cartridges or server side applications

Cartridges are server side applications that handle cartridge
specific requests from clients.
Some examples are :
? PL/SQL
? JAVA
? LiveHTML
? PERL
? ODBC
? VRML


Database Tier


Release 11 Database Server

The Release 11 database server contains the data
associated with Oracle Applications.

Installation process for Oracle Applications begins
here ,by creating a database and configuring Net8 to
accept connection for other servers.


Administration Server

The administration server is the machine used to maintain data
in the application database.
Three types of operation are carried out from here:
? Installing and upgrading the database.
? Applying Applications database updates.
? Maintaining applications data


Concurrent Processing server

To ensure that the long running ,data intensive
programs do not interfere with each other ,they are
configured to run on a separate machine called the
concurrent processing server.


THANK YOU


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Oracle apps architecture

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