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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>Understanding Oracle Application Express Architecture</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1" /> <meta name="date" content="2009-04-14T18:17:38Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="Understanding Oracle Application Express Architecture" /> <meta name="relnum" content="Release 3.2" /> <meta name="partnum" content="E11946-01" /> <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="intro_app.htm" title="Introducing Oracle Applicat..." type="text/html" /> <link rel="up" href="td_intarch.htm" title="Understanding Oracle Applic..." type="text/html" /> <link rel="prev" href="td_intabout.htm" title="Previous" type="text/html" /> <link rel="next" href="td_intenvir.htm" title="Next" type="text/html" /> </head> <body> <p id="BREADCRUMBING"><a href="preface.htm" title="Home">Home</a> > <a href="intro_app.htm" title="Introducing Oracle Applicat...">Introducing Oracle Applicat...</a> > Understanding Oracle Applic...</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="td_intabout.htm"><img src="../dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="td_intenvir.htm"><img src="../dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="CEGFAJBI" name="CEGFAJBI"></a></p> <div class="sect1"><!-- infolevel="all" infotype="General" --> <h1><a name="TDPAX01002|explains architecture"></a>Understanding <a id="sthref9" name="sthref9"></a><a id="sthref10" name="sthref10"></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 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 request or submit a page.</p> <p>The application session state is managed in the database tables within Oracle Application Express. It does not use a dedicated database connection. Instead, each request is made through a separate database session, consuming minimal CPU resources.</p> <a id="sthref11" name="sthref11"></a> <p class="subhead2">About <a id="sthref12" name="sthref12"></a>Oracle HTTP Server (Apache) and the <a id="sthref13" name="sthref13"></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 before Oracle Database 11.1 require Oracle HTTP Server (Apache) with <code>mod_plsql</code>. The following illustration shows that architecture.</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="sthref14" name="sthref14" 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 (Apache) from the architecture and replace it with the embedded PL/SQL gateway. The following illustration shows the 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="sthref15" name="sthref15" 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 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.</p> <a id="sthref16" name="sthref16"></a> <p class="subhead2">About the <a id="sthref17" name="sthref17"></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> </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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