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Saturday, January 26, 2008

Oracle 11i Applications Architecture




The Oracle Applications Architecture is a framework for multi-tiered, distributed computing that supports Oracle Applications products. In this model, various servers are distributed among multiple levels, or tiers.


Oracle Applications Architecture


The Desktop Tier


The client interface is provided through HTML for the newer HTML-based applications, and via a Java applet in a Web browser for the traditional Forms-based interface.


Forms-based Desktop Tier Architecture


In Oracle Applications Release 11i, each user logs in to Oracle Applications through the E-Business Suite Home Page on a desktop client web browser.


Forms Client Applet


The Forms client applet is a general-purpose presentation applet that supports all Oracle Applications Forms-based products, including those with customizations and extensions. The Forms client applet is packaged as a collection of Java Archive (JAR) files. The JAR files contain all Java classes required to run the presentation layer of Oracle Applications forms.


Oracle Jinitiator


The Forms client applet must run within a Java Virtual Machine (JVM) on the desktop client. The Oracle JInitiator component allows use of the Oracle JVM on web clients instead of the browser’s own JVM. JInitiator is implemented as a plug-in (Netscape) or ActiveX component (Microsoft Internet Explorer).


The Forms client applet and commonly used JAR files are downloaded from the Web server at the beginning of the client’s first session. Less commonly used JAR files are downloaded as needed.


The Application Tier


The Application tier has a dual role: hosting the various servers that process the business logic, and managing communication between the desktop tier and the database tier. This tier is sometimes referred to as the middle tier. Oracle9i Application Server (9iAS) provides the technology used on the application tier. Six servers comprise the application tier for Oracle Applications:


Web server

Forms server

Reports server

Discoverer server (optional)

Concurrent Processing server

Admin server


Try to avoid using a mixture of different platforms on your application tier. This makes maintenance easier, since only one set of patches needs to be downloaded.


Load Balancing


The application tier supports load balancing among many of its servers to provide higher availability, fault tolerance, reliability, and optimal scalability. If you have more than one of any of the following types of server, load balancing can be employed:


Web server

Forms server

Reports server

Discoverer server

Concurrent Processing server


Typically, load balancing is most commonly used to spread the load across multiple Web servers, where the load may vary significantly.

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