62 lines
4.6 KiB
HTML
62 lines
4.6 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Specifying PAGESIZE on CRTPF or CRTLF commands" />
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<meta name="abstract" content="When creating keyed files or indexes using the Create Physical File (CRTPF) or Create Logical File (CRTLF) commands, or the SQL CREATE INDEX statement, you can use the PAGESIZE parameter to specify the access path logical page size that is used by the system when the access path is created." />
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<meta name="description" content="When creating keyed files or indexes using the Create Physical File (CRTPF) or Create Logical File (CRTLF) commands, or the SQL CREATE INDEX statement, you can use the PAGESIZE parameter to specify the access path logical page size that is used by the system when the access path is created." />
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<title>Specifying PAGESIZE on CRTPF or CRTLF commands</title>
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</head>
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<body id="rzahgpagesize"><a name="rzahgpagesize"><!-- --></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">Specifying PAGESIZE on CRTPF or CRTLF commands</h1>
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<div><p>When creating keyed files or indexes using the <span class="cmdname">Create
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Physical File (CRTPF)</span> or <span class="cmdname">Create Logical File (CRTLF)</span> commands,
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or the SQL CREATE INDEX statement, you can use the PAGESIZE parameter to specify
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the access path logical page size that is used by the system when the access
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path is created.</p>
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<p>This logical page size is the amount of bytes of the access path that can
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be moved into the job's storage pool from the auxiliary storage for a page
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fault.</p>
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<p>You should consider using the default of *KEYLEN for this parameter except
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in rare circumstances so that the page size can be determined by the system
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based on the total length of the key, or keys. When the access path is used
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by very selective queries (for example, individual key look up), a smaller
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page size is typically more efficient. Also, when the keys being selected
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by queries are grouped together in the access path and many records are being
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selected, or the access path is being scanned, a larger page size is typically
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more efficient.</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="rzajqbinary.htm" title="A radix index is a multilevel, hybrid tree structure that allows a large number of key values to be stored efficiently while minimizing access times. A key compression algorithm assists in this process. The lowest level of the tree contains the leaf nodes, which contain the address of the rows in the base table that are associated with the key value. The key value is used to quickly navigator to the leaf node with a few simple binary search tests.">Binary radix indexes</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/crtlf.htm">Create Logical File (CRTLF) command</a></div>
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<div><a href="../cl/crtpf.htm">Create Physical File (CRTPF) command</a></div>
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<div><a href="../db2/rbafzmstxcindx.htm">SQL Create Index statement</a></div>
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</div>
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</div>
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</body>
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