48 lines
2.9 KiB
HTML
48 lines
2.9 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.rights.owner" content="(C) Copyright IBM Corporation 2005" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Avoid keyed sequence access paths" />
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<meta name="abstract" content="A copy that requires maintenance of a keyed sequence access path is slower than a copy from or to an arrival sequence access path." />
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<meta name="description" content="A copy that requires maintenance of a keyed sequence access path is slower than a copy from or to an arrival sequence access path." />
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<meta name="DC.Relation" scheme="URI" content="rbal3performance.htm" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbal3ksap" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Avoid keyed sequence access paths</title>
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</head>
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<body id="rbal3ksap"><a name="rbal3ksap"><!-- --></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">Avoid keyed sequence access paths</h1>
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<div><p>A copy that requires maintenance of a keyed sequence access path
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is slower than a copy from or to an arrival sequence access path. </p>
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<p>You can improve copy performance if you reorganize the from-file so that
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its arrival sequence is the same as its keyed sequence access path. You can
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also improve copy performance if you select records by using the FROMRCD or
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TORCD parameter so that the keyed sequence access path is not used.</p>
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<p>Create fewer logical access paths over the to-file. This improves copy
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performance because the copy process does not need to update as many access
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paths.</p>
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<p>The smaller the length of the records within the file, the faster the copy.</p>
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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="rbal3performance.htm" title="There are some guidelines that you can follow to improve the performance of your copy operations.">Performance</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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