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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 Materialized View Refresh</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 Materialized View Refresh" /> <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_reppit002.htm" title="Previous" type="text/html" /> <link rel="next" href="tdpii_reppit004.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_reppit002.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdpii_reppit004.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BEHBEBJA" name="BEHBEBJA"></a><a id="TDPII051" name="TDPII051"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>About Materialized View Refresh<a id="sthref397" name="sthref397"></a><a id="sthref398" name="sthref398"></a><a id="sthref399" name="sthref399"></a><a id="sthref400" name="sthref400"></a><a id="sthref401" name="sthref401"></a><a id="sthref402" name="sthref402"></a><a id="sthref403" name="sthref403"></a><a id="sthref404" name="sthref404"></a></h1> <a name="BEGIN" id="BEGIN"></a> <p>Refreshing a materialized view synchronizes data in the materialized view with data in its master table. The materialized view controls when the refresh is performed, either on a fixed schedule or on demand. During a refresh, row data from the master table is pulled down and applied at the materialized view site. Oracle Database provides the following refresh methods:</p> <ul> <li> <p><span class="bold">Fast refresh</span> pulls down only the rows that have changed since the last refresh.</p> </li> <li> <p><span class="bold">Complete refresh</span> updates the entire materialized view.</p> </li> <li> <p><span class="bold">Force refresh</span> performs a fast refresh when possible. When a fast refresh is not possible, force refresh performs a complete refresh.</p> </li> </ul> <p>A fast refresh is more efficient than a complete refresh. A fast refresh of a materialized view is possible only if the master table has a <span class="bold">materialized view log</span>. A materialized view log is a table at the master site that records all of the insert, update, and delete operations performed on the master table.</p> <p>A materialized view log is associated with a single master table, and each master table has only one materialized view log, regardless of how many materialized views refresh from the master table. When a fast refresh is performed on a materialized view, entries in the materialized view log that have appeared since the materialized view was last refreshed are applied to the materialized view.</p> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="tdpii_adpit002.htm#BABEDJGH">Refreshing Materialized Views</a></p> <p><a href="tdpii_reppit004.htm#BEHBGDFD">About Refresh Groups</a></p> <p><a href="tdpii_adpit011.htm#BABBBICG">Determining Which Materialized Views Are Currently Refreshing</a></p> <p><a href="tdpii_reppit001.htm#BEHHAHHA">About Materialized View Replication</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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