65 lines
3.8 KiB
HTML
65 lines
3.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Introduction to server performance" />
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<meta name="abstract" content="The performance characteristics of any computing environment may be described in the following terms." />
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<meta name="description" content="The performance characteristics of any computing environment may be described in the following terms." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Identifier" content="odbcperfintro" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Introduction to server performance</title>
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</head>
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<body id="odbcperfintro"><a name="odbcperfintro"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Introduction to server performance</h1>
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<div><p>The performance characteristics of any computing environment may
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be described in the following terms.</p>
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<div class="section"><dl><dt class="dlterm">Response time</dt>
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<dd>The amount of time that is required for a request to be processed</dd>
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<dt class="dlterm">Utilization</dt>
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<dd>The percentage of resources that are used when processing requests</dd>
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<dt class="dlterm">Throughput</dt>
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<dd>The volume of requests (per unit of time) that are being processed</dd>
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<dt class="dlterm">Capacity</dt>
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<dd>The maximum amount of throughput that is possible</dd>
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</dl>
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</div>
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<div class="section"><p>Typically, response time is the critical performance issue for <strong>users</strong> of
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a server. Utilization frequently is important to the <strong>administrators</strong> of
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a server. Maximum throughput is indicative of the performance <em>bottleneck,</em> and
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may not be a concern. While all of these characteristics are interrelated,
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the following summarizes server performance: </p>
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<ul><li>Every computing server has a bottleneck that governs performance: <strong>throughput</strong>.</li>
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<li>When server utilization increases, response time degrades.</li>
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</ul>
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</div>
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<div class="section"><p>In many servers, capacity is considerable, and is not an issue
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with users. In others, it is the primary performance concern. Response time
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is critical. One of the most important questions for administrators is: <em>How
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much can the server be degraded (by adding users, increasing utilization)
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before users begin objecting?</em></p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaikperftuneodbc.htm" title="A key consideration for ODBC application developers is achieving maximum performance from client/server applications.">Performance-tuning iSeries Access for Windows ODBC</a></div>
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</div>
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</div>
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</body>
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</html>
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