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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 2: Configuring a Queue and a Messaging Client</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 2: Configuring a Queue and a Messaging Client" /> <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_messaging016.htm" title="Previous" type="text/html" /> <link rel="next" href="tdpii_messaging018.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_messaging016.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_messaging018.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABGHHDA" name="BABGHHDA"></a><a id="TDPII098" name="TDPII098"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>Task 2: Configuring a Queue and a Messaging Client<a id="sthref627" name="sthref627"></a><a id="sthref628" name="sthref628"></a><a id="sthref629" name="sthref629"></a></h1> <a name="BEGIN" id="BEGIN"></a> <p>Create a queue table and a queue to store the messages that the first application will generate for the second application. After the queue is created, message notification requires a consumer who can dequeue messages from the queue. In this example, a messaging client is the consumer who can dequeue messages from the <code>streams_queue</code> queue.</p> <p class="orderedlisttitle">To configure a queue and a messaging client: </p> <ol> <li> <p>Create a queue named <code>streams_queue</code> in the schema of the Oracle Streams administrator. See <a href="tdpii_common_ii005.htm#CHDJHCAI">"Creating an ANYDATA Queue"</a> for instructions.</p> </li> <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="sthref631" name="sthref631"></a>Create a messaging client to enable the Oracle Streams administrator to dequeue messages from the <code>streams_queue</code> queue:</p> <pre xml:space="preserve" class="oac_no_warn"> BEGIN DBMS_STREAMS_ADM.ADD_MESSAGE_RULE ( message_type => 'strmadmin.app_info', rule_condition => ':MSG.VALUE >= 0', streams_type => 'DEQUEUE', streams_name => 'strmadmin', queue_name => 'strmadmin.streams_queue'); END; / </pre> <p>The user name for the Oracle Streams administrator must be specified for the <code>streams_name</code> parameter. In this example, the user name for the Oracle Streams administrator is <code>strmadmin</code>. The name of the new messaging client is also <code>strmadmin</code>.</p> <p>A messaging client uses rules to determine which messages to dequeue. In this example, the rule for the messaging client specifies that all messages with a <code>value</code> greater than zero should be dequeued. So, with this rule, the messaging client will dequeue all new messages of type <code>strmadmin.app_info</code> that appear in <code>strmadmin.streams_queue</code> because all parameter values are greater than or equal to zero.</p> </li> <li> <p>Complete the steps in <a href="tdpii_messaging018.htm#BABFGHCC">"Task 3: Configuring a Mechanism for Dequeuing Messages"</a> to continue this extended example.</p> </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" --> <!-- 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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