80 lines
4.5 KiB
HTML
80 lines
4.5 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="DC.Type" content="task" />
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<meta name="DC.Title" content="Define a physical file using DDS" />
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<meta name="abstract" content="You use file-level, record-level, field-level, and key-field-level entries to define a physical file with DDS." />
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<meta name="description" content="You use file-level, record-level, field-level, and key-field-level entries to define a physical file with DDS." />
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<meta name="DC.subject" content="defining a physical file" />
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<meta name="keywords" content="defining a physical file" />
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<meta name="DC.Relation" scheme="URI" content="phlogf1.htm" />
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<meta name="DC.Relation" scheme="URI" content="../dds/rbafpmstsyntax.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Identifier" content="dphydds" />
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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>Define a physical file using DDS</title>
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</head>
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<body id="dphydds"><a name="dphydds"><!-- --></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">Define a physical file using DDS</h1>
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<div><p>You use file-level, record-level, field-level, and key-field-level
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entries to define a physical file with DDS.</p>
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<div class="section"> <p>A physical file can contain only one record
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format. Follow these instructions to define a physical file:</p>
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</div>
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<ol><li class="stepexpand"><span>Specify the record format in either of the following two
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ways:</span> <ul><li>Define a new record format. <p>Specify field and key-field
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specifications as required for the new record format.</p>
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</li>
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<li>Share an existing record format.<p>Use the FORMAT keyword
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to specify that the operating system is to use a previously defined record
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format from another physical file. When the FORMAT keyword is used, you must
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specify key-field level specifications again (if a keyed access path is required)
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even if they were specified on the existing record format.</p>
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</li>
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</ul>
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</li>
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<li class="stepexpand"><span>Specify the entries in the following order to define a physical
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file:</span> <ol type="a"><li>File-level entries</li>
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<li>Record-level entries</li>
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<li>Field-level entries</li>
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<li>Key field-level entries</li>
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</ol>
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</li>
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</ol>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> The file name is specified through the Create Physical File
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(CRTPF) command, not through DDS.</div>
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<p>The maximum number
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of fields in a record format is 8000. If any of the fields in the record format
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are date, time, timestamp, variable length, or allows the null value, then
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the actual maximum number of fields can be less than 8000. The maximum number
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of fields can vary depending on the number of fields and combinations of fields
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that occur within the record format. The maximum number of bytes in a record
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format is 32 766 if variable length fields are not included and 32 740
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if variable length fields are included.</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="phlogf1.htm" title="This topic provides information about coding physical and logical files that use DDS, and describes the positional entries used by these files.">Define physical and logical files using DDS</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="../dds/rbafpmstsyntax.htm">Rules for DDS keywords and parameter values</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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