Abstract
Oracle Application Express (APEX) is a declarative, database-centric application development tool that runs within the Oracle Database. APEX does not fit the classic three-tiered physical model where applications are deployed to the application tier. The definitions of applications are stored in database tables within the Oracle Database. The application server tier manages browser requests and passes page “Gets” and “Posts” to the Oracle Database. In this way, the application server tier is basically a proxy to the APEX engine installed within the Oracle Database. For non-critical applications, or running on a laptop, the XDB listener with the Embedded PL/SQL Gateway (EPG) can be used as the web listener allowing you to run with a database-only configuration. Figure 12–1 shows this configuration.
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