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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>Task 5: Enqueuing Messages and Checking for Message Notification</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="Task 5: Enqueuing Messages and Checking for Message Notification" /> <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_messaging019.htm" title="Previous" type="text/html" /> <link rel="next" href="tdpii_messaging021.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_messaging019.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_messaging021.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABEGBAG" name="BABEGBAG"></a><a id="TDPII101" name="TDPII101"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>Task 5: Enqueuing Messages and Checking for Message Notification<a id="sthref641" name="sthref641"></a><a id="sthref642" name="sthref642"></a><a id="sthref643" name="sthref643"></a><a id="sthref644" name="sthref644"></a></h1> <a name="BEGIN" id="BEGIN"></a> <p>In this extended example, one application enqueues messages that are processed by a second application. For simplicity, this example enqueues messages manually. After the messages are enqueued, you can ensure that they have been dequeued automatically through message notification.</p> <p class="orderedlisttitle">To enqueue messages and check for message notification: </p> <ol> <li> <p>On a command line, open SQL*Plus and connect to the database as the Oracle Streams administrator.</p> <p>See <a href="topicid:ADMQS0361">Starting SQL*Plus and Connecting to the Database</a> for more information about starting SQL*Plus.</p> </li> <li> <p><a id="sthref646" name="sthref646"></a>Enqueue messages into the <code>strmadmin.streams_queue</code> queue:</p> <pre xml:space="preserve" class="oac_no_warn"> DECLARE msg strmadmin.app_info; BEGIN msg := strmadmin.app_info( parameter => 'THRESHOLD', value => 1000); DBMS_STREAMS_MESSAGING.ENQUEUE ( queue_name => 'strmadmin.streams_queue', payload => ANYDATA.CONVERTOBJECT(msg)); COMMIT; END; / DECLARE msg strmadmin.app_info; BEGIN msg := strmadmin.app_info( parameter => 'MIN_WAIT', value => 1); DBMS_STREAMS_MESSAGING.ENQUEUE ( queue_name => 'strmadmin.streams_queue', payload => ANYDATA.CONVERTOBJECT(msg)); COMMIT; END; / DECLARE msg strmadmin.app_info; BEGIN msg := strmadmin.app_info( parameter => 'BUFFER_SIZE', value => 30); DBMS_STREAMS_MESSAGING.ENQUEUE ( queue_name => 'strmadmin.streams_queue', payload => ANYDATA.CONVERTOBJECT(msg)); COMMIT; END; / </pre></li> <li> <p>Optionally, view the messages in the <code>streams_queue</code> queue, and check to see if they have been dequeued automatically using message notification. See <a href="tdpii_messaging025.htm#BABBAHDB">"Viewing the Messages in a Queue"</a> for instructions.</p> <p>When the message notification configured in this example is working properly, you should see one of the following on the Messages page:</p> <ul> <li> <p>One or more of the enqueued messages might appear with <code>Processed</code> in the Consumers in Different States field. A <code>Processed</code> value in this field means that the message has been dequeued by all consumers.</p> </li> <li> <p>No messages appear in the queue. Eventually, processed messages are deleted from a queue automatically. If no messages appear, then the enqueued messages were dequeued by message notification and then deleted automatically.</p> </li> </ul> </li> </ol> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="tdpii_messaging015.htm#CHDGEHCF">Tutorial: Configuring Message Notifications</a></p> <p><a href="tdpii_messaging001.htm#CHDIJFHB">About Messaging</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. All rights reserved.</span><br /> <a href="./dcommon/html/cpyr.htm"><span class="copyrightlogo">Legal Notices</span></a></td> <td align="center"><a href="tdpii_messaging019.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_messaging021.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> </div> <!-- class="footer" --> </body> </html>
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