85 lines
4.3 KiB
HTML
85 lines
4.3 KiB
HTML
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<meta name="DC.Title" content="SQL performance general considerations" />
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<meta name="abstract" content="Performance of SQL in application programs is important to ALL server users, because inefficient usage of SQL can waste server resources." />
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<title>SQL performance general considerations</title>
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</head>
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<body id="sqlperfgencons"><a name="sqlperfgencons"><!-- --></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">SQL performance general considerations</h1>
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<div><p>Performance of <span class="keyword">SQL</span> in
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application programs is important to ALL server users, because inefficient
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usage of <span class="keyword">SQL</span> can waste
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server resources.</p>
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<div class="section"><p>The primary goal in using <span class="keyword">SQL</span> is
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to obtain the correct results for your database request, and in a timely manner.</p>
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</div>
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<div class="section"><p>Before you start designing for performance, review the following
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considerations: </p>
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<dl><dt class="dlterm">When to consider performance:</dt>
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<dd> <ul><li>Database with over 10,000 rows - Performance impact: <strong>noticeable</strong></li>
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<li>Database with over 100,000 rows - Performance impact: <strong>concern</strong></li>
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<li>When repetitively using complex queries</li>
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<li>When using multiple work stations with high transaction rates</li>
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</ul>
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</dd>
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<dt class="dlterm">What resource to optimize:</dt>
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<dd> <ul><li>I/O usage</li>
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<li>CPU usage</li>
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<li>Effective usage of indexes</li>
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<li>OPEN/CLOSE performance</li>
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<li>Concurrency (COMMIT)</li>
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</ul>
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</dd>
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<dt class="dlterm">How to design for performance:</dt>
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<dd> <ul><li><strong>Database design:</strong> <ul><li>Table structure</li>
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<li>Indexes</li>
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<li>Table data management</li>
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<li>Journal management</li>
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</ul>
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</li>
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<li><strong>Application design:</strong> <ul><li>Structure of programs involved</li>
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</ul>
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</li>
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<li><strong>Program design:</strong> <ul><li>Coding practices</li>
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<li>Performance monitoring</li>
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</ul>
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</li>
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</ul>
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</dd>
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</dl>
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</div>
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<div class="section"><p>The <em>SQL Reference</em> book contains additional information.
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You can view an HTML online version of the book, or print a PDF version, from
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the <a href="../db2/rbafzmst02.htm">DB2
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Universal Database™ for iSeries™ SQL Reference</a> iSeries Information Center topic.</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="rzaiksqlperf.htm" title="Good application design includes the efficient use of machine resources. To run in a manner that is acceptable to the end user, an application program must be efficient in operation, and must run with adequate response time.">SQL performance</a></div>
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</div>
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</div>
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</body>
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