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101 lines
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<meta name="abstract" content="Achieving efficient server performance requires a proper balance among server resources. Overusing any resource adversely affects performance. This topic describes the server commands that are available to help you observe the performance of your server." />
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<title>Improve distributed relational database performance through the server</title>
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</head>
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<body id="rbal1improvesystem"><a name="rbal1improvesystem"><!-- --></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">Improve distributed relational database performance through the server</h1>
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<div><p>Achieving efficient server performance requires a proper balance
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among server resources. Overusing any resource adversely affects performance.
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This topic describes the server commands that are available to help you observe
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the performance of your server.</p>
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<div class="section"><p>You can use the <span class="keyword">iSeries™</span> Performance
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Tools licensed program to help analyze your performance. In addition, there
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are some system commands available to help you observe the performance of
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your server: </p>
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</div>
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<div class="section"> <ul><li><span class="cmdname">Work with System Status (WRKSYSSTS)</span> command</li>
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<li><span class="cmdname">Work with Disk Status (WRKDSKSTS)</span> command</li>
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<li><span class="cmdname">Work with Active Jobs (WRKACTJOB)</span> command</li>
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</ul>
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</div>
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<div class="section"><p>In using them, you should observe server performance during typical
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levels of activity. For example, statistics gathered when no jobs are running
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on the server are of little value in assessing server performance. To observe
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the server performance, complete the following steps:</p>
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</div>
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<div class="section"> <ol><li>Enter the (<span class="cmdname">WRKSYSSTS</span>), (<span class="cmdname">WRKDSKSTS</span>),
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or (<span class="cmdname">WRKACTJOB</span>) command.</li>
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<li>Allow the server to collect data for a minimum of 5 minutes.</li>
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<li>Press F5 (Refresh) to refresh the display and present the performance
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data.</li>
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<li>Tune your server based on the new data.</li>
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</ol>
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</div>
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<div class="section"><p>Press F10 (Restart) to restart the elapsed time counter.</p>
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</div>
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<div class="section"><p>Use both the <span class="cmdname">Work with System Status (WRKSYSSTS)</span> and
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the <span class="cmdname">Work with Active Jobs (WRKACTJOB)</span> commands when observing
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the performance of your system. With each observation period, you should examine
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and evaluate the measures of server performance against the goals you have
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set.</p>
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</div>
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<div class="section"><p>Some of the typical measures include: </p>
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<ul><li>Interactive throughput and response time, available from the (<span class="cmdname">WRKACTJOB</span>)
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display.</li>
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<li>Batch throughput. Observe the <samp class="codeph">AuxIO</samp> and <samp class="codeph">CPU%</samp> values
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for active batch jobs.</li>
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<li>Spool throughput. Observe the <samp class="codeph">AuxIO</samp> and <samp class="codeph">CPU%</samp> values
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for active writers.</li>
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</ul>
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<p>Each time you make tuning adjustments, you should measure and compare
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all of your main performance measures. Make and evaluate adjustments one at
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a time.</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="rbal1perform.htm" title="No matter what kind of application programs you are running on a server, performance can always be a concern. For a distributed relational database, network, server, and application performance are all crucial.">Performance</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rbal1act.htm" title="Use the Work with Active Jobs (WRKACTJOB) command if you want to monitor the jobs running for several users or if you are looking for a job and you do not know the job name or the user ID.">Work with active jobs in a distributed relational database</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/wrksyssts.htm">Work with System Status (WRKSYSSTS) command</a></div>
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<div><a href="../cl/wrkdsksts.htm">Work with Disk Status (WRKDSKSTS) command</a></div>
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<div><a href="../cl/wrkactjob.htm">Work with Active Jobs (WRKACTJOB) command</a></div>
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<div><a href="../rzaks/rzaks1.htm">Work management</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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