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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 Why Dequeued Messages Remain in a Queue</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 005" /> <meta name="date" content="2009-06-04T17:1:3Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="Understanding Why Dequeued Messages Remain in a Queue" /> <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_messaging031.htm" title="Previous" type="text/html" /> <link rel="next" href="tdpii_diverge.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_messaging031.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_diverge.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABDJJDB" name="BABDJJDB"></a><a id="TDPII186" name="TDPII186"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>Understanding Why Dequeued Messages Remain in a Queue<a id="sthref692" name="sthref692"></a><a id="sthref693" name="sthref693"></a><a id="sthref694" name="sthref694"></a><a id="sthref695" name="sthref695"></a></h1> <a name="BEGIN" id="BEGIN"></a> <p>A message can remain in a queue after it has been dequeued for the following reasons:</p> <ul> <li> <p>One or more consumers of the message have not yet dequeued it. A message is not removed from a queue until all of its consumers have dequeued it.</p> </li> <li> <p>The message has not been cleaned up by a background process. After all of the consumers of a message have dequeued it, the message remains in the queue until a background process removes it automatically.</p> </li> </ul> <p>If you see messages in a queue that were dequeued by a consumer, then you can use Enterprise Manager to check on the consumers for a message and to determine whether all of the consumers for a message have dequeued it.</p> <p class="orderedlisttitle">To check on messages in a queue: </p> <ol> <li> <p>Follow the instructions in <a href="tdpii_messaging027.htm#BABBJDHF">"Viewing the Consumers Who Can Dequeue Messages"</a> to view the consumers who can dequeue the messages. If there are multiple consumers for a message, then some consumers might not have dequeued the message yet.</p> </li> <li> <p>Follow the instructions in <a href="tdpii_messaging025.htm#BABBAHDB">"Viewing the Messages in a Queue"</a>. If the Consumers in Different States field shows <code>PROCESSED</code> for a message, then all of the consumers of the message have dequeued it. In this case, the message remains in the queue until the background process removes it automatically.</p> </li> </ol> <div class="helpinfonotealso"> <h2>Related Topics</h2> <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></p> <p><a href="tdpii_messaging028.htm#CHDDGAFD">Troubleshooting a Messaging Environment</a></p> <p><a href="tdpii_messaging001.htm#CHDIJFHB">About 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> </div> </div> <!-- class="sect2" --> <!-- 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 © 2007, 2009, Oracle and/or its affiliates. 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