59 lines
4.2 KiB
HTML
59 lines
4.2 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Replication of column statistics with CRTDUPOBJ versus CPYF" />
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<meta name="abstract" content="You can replicate column statistics with the Create Duplicate Object (CRTDUPOBJ) or the Copy File (CPYF) commands." />
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<meta name="description" content="You can replicate column statistics with the Create Duplicate Object (CRTDUPOBJ) or the Copy File (CPYF) commands." />
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<meta name="DC.subject" content="statistics manager, replication of column statistics" />
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<meta name="keywords" content="statistics manager, replication of column statistics" />
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<meta name="DC.Relation" scheme="URI" content="statsmanager.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/crtdupobj.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/cpyf.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Replication of column statistics with CRTDUPOBJ versus CPYF</title>
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</head>
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<body id="replicatestats"><a name="replicatestats"><!-- --></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">Replication of column statistics with <span class="cmdname">CRTDUPOBJ</span> versus <span class="cmdname">CPYF</span></h1>
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<div><p>You can replicate column statistics with the <span class="cmdname">Create Duplicate
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Object (CRTDUPOBJ)</span> or the <span class="cmdname">Copy File (CPYF)</span> commands.</p>
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<div class="section"><p>Statistics are not copied to new tables when using the <span class="cmdname">Copy
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File (CPYF)</span> command. If statistics are needed immediately after
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using this command, then you must manually generate the statistics using iSeries™ Navigator
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or the statistics APIs. If statistics are not needed immediately, then the
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creation of column statistics may be performed automatically by the system
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after the first touch of a column by a query.</p>
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<p>Statistics are copied
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when using <span class="cmdname">Create Duplicate Object (CRTDUPOBJ)</span> command
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with DATA(*YES). You can use this as an alternative to creating statistics
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automatically after using a <span class="cmdname">Copy File (CPYF)</span> command.</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="statsmanager.htm" title="As stated earlier, the collection of statistics is handled by a separate component called the Statistics Manager. Statistical information can be used by the query optimizer to determine the best access plan for a query. Since the query optimizer bases its choice of access plan on the statistical information found in the table, it is important that this information be current.">Collecting statistics with the Statistics Manager</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/crtdupobj.htm">Create Duplicate Object (CRTDUPOBJ) command</a></div>
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<div><a href="../cl/cpyf.htm">Copy File (CPYF) command</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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