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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>Monitoring I/O by Function</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 005" /> <meta name="date" content="2009-05-27T15:13:1Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="Monitoring I/O by Function" /> <meta name="relnum" content="11g Release 2 (11.2)" /> <meta name="partnum" content="E10822-01" /> <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="tdppt_realtime013.htm" title="Previous" type="text/html" /> <link rel="next" href="tdppt_realtime015.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="tdppt_realtime013.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdppt_realtime015.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="CBBEFAAC" name="CBBEFAAC"></a><a id="TDPPT329" name="TDPPT329"></a></p> <div class="sect3"><!-- infolevel="all" infotype="General" --> <h1>Monitoring I/O by Function</h1> <a name="BEGIN" id="BEGIN"></a> <p>The I/O Function charts determine I/O usage level by application or job. The component-level statistics give a detailed view of the I/O bandwidth usage, which you can then use in scheduling jobs and I/O provisioning. The component-level statistics fall in the following categories:</p> <ul> <li> <p>Background type</p> <p>This category includes ARCH, LGWR, and DBWR.</p> </li> <li> <p>Activity</p> <p>This category includes XML DB, Streams AQ, Data Pump, Recovery, and RMAN.</p> </li> <li> <p>I/O type</p> <p>The category includes the following:</p> <ul> <li> <p>Direct Write</p> <p>This write is made by a foreground process and is not from the buffer cache.</p> </li> <li> <p>Direct Read</p> <p>This read is physical I/O from a datafile that bypasses the buffer cache and reads the data block directly into process-private memory.</p> </li> <li> <p>Buffer Cache Read</p> </li> </ul> </li> <li> <p>Others</p> <p>This category includes I/Os such as control file I/Os.</p> </li> </ul> <p class="orderedlisttitle">To monitor I/O by function: </p> <ol> <li> <p>From the Database Home page, click <span class="bold">Performance</span>.</p> <p>The Performance page appears.</p> </li> <li> <p>In the instance activity chart, click <span class="bold">I/O</span>.</p> <p>The I/O Megabytes per Second and I/O Requests per Second charts appear.</p> </li> <li> <p>For <span class="bold">I/O Breakdown</span>, select <span class="bold">I/O Function</span>.</p> <p>The I/O Megabytes per Second by I/O Function and I/O Requests per Second by I/O Function charts appear.</p> </li> <li> <p>Click the largest block on the chart or its corresponding function in the legend to drill down to the function with the highest I/O rate.</p> <p>The I/O Details page appears.</p> <p>You can view real-time or historical data for details on I/O megabytes or I/O requests.</p> </li> </ol> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=CNCPT1249','newWindow').focus()"><span class="italic">Oracle Database Concepts</span></a> to learn about database background processes such as ARCH, LGWR, and DBWR</p> <p><a href="tdppt_realtime013.htm#CBBIFFJE">Monitoring I/O</a></p> </div> </div> <!-- class="sect3" --> <!-- 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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