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Oracle® Application Express Application Builder User's Guide
Release 4.2

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1.2 About Oracle Application Express

Oracle Application Express installs with your Oracle database and consists of data in tables and PL/SQL code.

Whether you run the Oracle Application Express development environment or an application you built using Oracle Application Express, the process is the same. Your browser sends a URL request that is translated into the appropriate Oracle Application Express PL/SQL call. After the database processes the PL/SQL, the results are relayed back to your browser as HTML. This cycle happens each time you either request or submit a page.

The application session state is managed in the database tables within Application Express. It does not use a dedicated database connection. Instead, each request is made through a new database session, consuming minimal CPU resources.

About the Application Express Engine

The Application Express engine renders and processes pages. It also performs these tasks:

Different Oracle Application Express Environments

When you install Oracle Application Express, you can install two different environments: