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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>Setting Metric Thresholds for Performance Alerts</title> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 005" /> <meta name="date" content="2009-05-27T15:13:2Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="Setting Metric Thresholds for Performance Alerts" /> <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_alerts.htm" title="Previous" type="text/html" /> <link rel="next" href="tdppt_alerts002.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_alerts.htm"><img src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdppt_alerts002.htm"><img src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BEIJHEAI" name="BEIJHEAI"></a><a id="TDPPT046" name="TDPPT046"></a></p> <div class="sect1"><!-- infolevel="all" infotype="General" --> <h1>Setting Metric Thresholds for Performance Alerts</h1> <a name="BEGIN" id="BEGIN"></a> <p>A <a id="sthref169" name="sthref169"></a><span class="bold">metric</span> is the rate of change in a cumulative statistic. This rate can be measured against a variety of units, including time, transactions, or database calls. For example, the number of database calls per second is a metric. You can set thresholds on a metric so that an alert is generated when the threshold is passed.</p> <p>Performance alerts<a id="sthref170" name="sthref170"></a><a id="sthref171" name="sthref171"></a> are based on metrics that are performance-related. These alerts are either environment-dependent or application-dependent.</p> <p>Environment-dependent performance alerts may not be relevant on all systems. For example, the <code>AVERAGE_FILE_READ_TIME</code> metric generates an alert when the average time to read a file exceeds the metric threshold. This alert may be useful on a system with only one disk. On a system with multiple disks, however, the alert may not be relevant because I/O processing is spread across the entire subsystem.</p> <p>Application-dependent performance alerts are typically relevant on all systems. For example, the <code>BLOCKED_USERS</code> metric generates a performance alert when the number of users blocked by a particular session exceeds the metric threshold. This alert is relevant regardless of how the environment is configured.</p> <p>To obtain the most relevant information from performance alerts, set the threshold values of performance metrics to values that represent desirable boundaries for your system. You can then fine-tune these values over time until an equilibrium is reached.</p> <p class="orderedlisttitle">To set thresholds for performance metrics: </p> <ol> <li> <p>On the Database Home page, under Related Links, click <img src="shortcut.png" alt="callback" border="0" /><a href="javascript:void(0);" onclick="redirectEMpage('METRIC_POLICY_SETTINGS');"><span class="bold">Metric and Policy Settings</span></a>.</p> <p>The Metric and Policy Settings page appears, showing the Metric Thresholds subpage.</p> </li> <li> <p>For each performance metric relevant for your system, click the <span class="bold">Edit</span> icon.</p> <p>The Edit Advanced Settings page appears.</p> </li> <li> <p>Follow the steps of the wizard to set the threshold value.</p> </li> </ol> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="tdppt_degrade007.htm#CACDACHD">Setting Metric Thresholds for Baselines</a></p> <p><a href="topicid:ADMQS10142">Setting Metric Thresholds</a> to learn how to set metric thresholds</p> <p><a href="tdppt_alerts.htm#BEIDDIIG">Monitoring Performance Alerts</a></p> </div> </div> <!-- 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. 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