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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 Message Modes</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 005" /> <meta name="date" content="2009-06-04T17:1:2Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="About Message Modes" /> <meta name="relnum" content="11g Release 2 (11.2)" /> <meta name="partnum" content="E10703-01" /> <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="prev" href="tdpii_messaging002.htm" title="Previous" type="text/html" /> <link rel="next" href="tdpii_messaging004.htm" title="Next" type="text/html" /> <script src="./callback.js" type="text/javascript"></script> <noscript>Your browser does not support JavaScript. This help page requires JavaScript to render correctly.</noscript> </head> <body> <div class="zz-skip-header"><a href="#BEGIN">Skip Headers</a></div> <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="tdpii_messaging002.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_messaging004.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="CHDCFHBF" name="CHDCFHBF"></a><a id="TDPII029" name="TDPII029"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>About Message Modes<a id="sthref562" name="sthref562"></a><a id="sthref563" name="sthref563"></a><a id="sthref564" name="sthref564"></a><a id="sthref565" name="sthref565"></a><a id="sthref566" name="sthref566"></a><a id="sthref567" name="sthref567"></a><a id="sthref568" name="sthref568"></a><a id="sthref569" name="sthref569"></a></h1> <a name="BEGIN" id="BEGIN"></a> <p>Oracle Streams Advanced Queuing (AQ) supports the following <span class="bold">message modes</span>:</p> <ul> <li> <p><span class="bold">Persistent messaging:</span> Messages are always stored on disk in a database table called a <span class="bold">queue table</span>. This type of storage is sometimes called <span class="bold">persistent queue</span> storage.</p> </li> <li> <p><span class="bold">Buffered messaging:</span> Messages are stored in memory but can spill to a queue table under certain conditions. This type of storage is sometimes called <span class="bold">buffered queue</span> storage.</p> </li> </ul> <p>Buffered messaging provides better performance, but it does not support some messaging features, such as message retention. Message retention lets you specify the amount of time a message is retained in the queue table after being dequeued. In addition, when a database goes down unexpectedly, persistent messages are retained on disk, but buffered messages can be lost because they are stored in memory.</p> <p>Message retention provides an audit trail, which might be required for some organizations. For example, while messages are stored in the queue table, users and applications can run queries to gather information about the messages. For example, a sales application might gather this information to generate a report on orders.</p> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="tdpii_messaging007.htm#CHDGIEEC">Preparing for Messaging</a></p> <p><a href="tdpii_messaging008.htm#CHDBACBE">Tutorial: Sending Messages Between Oracle Databases</a></p> <p><a href="tdpii_messaging015.htm#CHDGEHCF">Tutorial: Configuring Message Notifications</a></p> <p><a href="tdpii_messaging024.htm#CHDDICBF">Monitoring a Messaging Environment</a></p> <p><a href="tdpii_messaging028.htm#CHDDGAFD">Troubleshooting a Messaging Environment</a></p> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=ADQUE','newWindow').focus()"><span class="italic">Oracle Streams Advanced Queuing User's Guide</span></a> for information about the differences between persistent messaging and buffered messaging</p> </div> </div> <!-- class="sect2" --> <!-- 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 © 2007, 2009, Oracle and/or its affiliates. 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