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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 Ordering</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 Ordering" /> <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_messaging001.htm" title="Previous" type="text/html" /> <link rel="next" href="tdpii_messaging003.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_messaging001.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_messaging003.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="CHDDACEF" name="CHDDACEF"></a><a id="TDPII028" name="TDPII028"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>About Message Ordering<a id="sthref559" name="sthref559"></a><a id="sthref560" name="sthref560"></a><a id="sthref561" name="sthref561"></a></h1> <a name="BEGIN" id="BEGIN"></a> <p><span class="bold">Message ordering</span> determines the order in which messages are dequeued. Oracle Streams Advanced Queuing (AQ) provides the following options for message ordering:</p> <ul> <li> <p><span class="bold">Enqueue time:</span> Messages are dequeued in the same order that they were enqueued. This option is sometimes called first in first out (FIFO) ordering. For example, banking applications often use this ordering so that financial transactions are always ordered according to the time when they occurred.</p> </li> <li> <p><span class="bold">Priority:</span> A priority is specified for messages during enqueuing, and messages are dequeued based on their priority. For example, shipping companies might use this ordering for messages because some packages have higher priority than others.</p> </li> <li> <p><span class="bold">Commit time:</span> Messages are dequeued based on when the transaction that enqueued the messages committed. Commit-time ordering is typically used when the messages result in database changes with transaction dependencies. For example, an application that handles sales for a company might use commit-time ordering when the messages result in changes to a number of database tables that have dependencies.</p> </li> </ul> <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> </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. 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_messaging001.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_messaging003.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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