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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> <title>About Oracle Application Express Architecture</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1" /> <meta name="date" content="2009-04-14T16:11:24Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="About Oracle Application Express Architecture" /> <meta name="relnum" content="Release 3.2" /> <meta name="partnum" content="E11947-01" /> <link rel="copyright" href="dcommon/html/cpyr.htm" title="Copyright" type="text/html" /> <link rel="stylesheet" href="dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" /> <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> <link rel="up" href="preface.htm" title="Home" type="text/html" /> <link rel="up" href="start.htm" title="Quick Start" type="text/html" /> <link rel="up" href="start_arch.htm" title="About Oracle Application Ex..." type="text/html" /> <link rel="prev" href="start_about.htm" title="Previous" type="text/html" /> <link rel="next" href="start_users.htm" title="Next" type="text/html" /> </head> <body> <p id="BREADCRUMBING"><a href="preface.htm" title="Home">Home</a> > <a href="start.htm" title="Quick Start">Quick Start</a> > About Oracle Application Ex...</p> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr valign="bottom"> <td align="left"></td> <td align="center"><a href="start_about.htm"><img src="dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="start_users.htm"><img src="dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABEAFGB" name="BABEAFGB"></a></p> <div class="sect1"><!-- infolevel="all" infotype="General" --> <h1><a name="HTMDB25001" id="HTMDB25001"></a>About <a id="sthref27" name="sthref27"></a><a id="sthref28" name="sthref28"></a>Oracle Application Express Architecture</h1> <p>Oracle Application Express installs with your Oracle database and is comprised of data in tables and PL/SQL code.</p> <p>Whether you are running 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.</p> <p>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.</p> <a id="sthref29" name="sthref29"></a> <p class="subhead2">About Oracle HTTP Server (Apache) and the <a id="sthref30" name="sthref30"></a>Embedded PL/SQL Gateway</p> <p>The version of Oracle Database you use determines how the URL is translated:</p> <ul> <li> <p>Versions prior to Oracle Database 11.1 require Oracle HTTP Server (Apache) with <code>mod_plsql</code>. The following graphic illustrates the three-tier architecture<code>.</code></p> <img src="img/arch.gif" alt="Description of arch.gif follows" title="Description of arch.gif follows" longdesc="img_text/arch.htm" /><br /> <a id="sthref31" name="sthref31" href="img_text/arch.htm">Description of the illustration arch.gif</a><br /> <br /></li> </ul> <ul> <li> <p>With Oracle Database 11.1 or later or Oracle Database 10<span class="italic">g</span> Express Edition, you can remove Oracle HTTP Server and <code>mod_plsql</code> from the architecture and replace it with the embedded PL/SQL gateway. The following graphic illustrates the two-tier architecture using the embedded PL/SQL gateway.</p> <img src="img/arch_epg.gif" alt="Description of arch_epg.gif follows" title="Description of arch_epg.gif follows" longdesc="img_text/arch_epg.htm" /><br /> <a id="sthref32" name="sthref32" href="img_text/arch_epg.htm">Description of the illustration arch_epg.gif</a><br /> <br /></li> </ul> <p>The embedded PL/SQL gateway provides the Oracle database with a Web server and also the necessary infrastructure to create dynamic applications. The embedded PL/SQL gateway runs in the XML DB HTTP server in the Oracle database and includes the core features of <code>mod_plsql</code>, but does not require the Oracle HTTP Server powered by Apache. Inclusion of the embedded PL/SQL gateway simplifies the architecture and eliminates the middle tier entirely.</p> <a id="sthref33" name="sthref33"></a> <p class="subhead2">About the <a id="sthref34" name="sthref34"></a><a id="sthref35" name="sthref35"></a>Application Express Engine</p> <p>The Application Express engine renders and processes pages. It also performs these tasks:</p> <ul> <li> <p>session state management</p> </li> <li> <p>authentication services</p> </li> <li> <p>authorization services</p> </li> <li> <p>page flow control</p> </li> <li> <p>validations processing</p> </li> </ul> <a id="sthref36" name="sthref36"></a> <p class="subhead2">Different Oracle Application Express Environments</p> <p>When you install Oracle Application Express, you can install two different environments:</p> <ul> <li> <p>A <span class="bold"><a id="sthref37" name="sthref37"></a>runtime environment</span> is the appropriate choice for production implementations in which users can run applications that cannot be modified.</p> </li> <li> <p>A <span class="bold"><a id="sthref38" name="sthref38"></a>full development environment</span> provides complete access to the Application Builder environment to develop applications as described in this document.</p> </li> </ul> <div align="center"> <div class="inftblnotealso"><br /> <table class="NoteAlso oac_no_warn" summary="" cellpadding="3" cellspacing="0"> <tbody> <tr> <td align="left"> <p class="notep1">See Also:</p> <a href="http://www.oracle.com/pls/db112/lookup?id=HTMIG"><span class="italic">Oracle Application Express Installation Guide</span></a></td> </tr> </tbody> </table> <br /></div> <!-- class="inftblnotealso" --></div> </div> <!-- class="sect1" --> <!-- Start Footer --> <div class="footer"> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr> <td align="left"><span class="copyrightlogo">Copyright © 2003, 2009, Oracle and/or its affiliates. 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