62 lines
4.4 KiB
HTML
62 lines
4.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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.Title" content="Define a logical file using DDS" />
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<meta name="abstract" content="A logical file determines how data records are selected and defined when read by an application program. A logical file can be a simple, multiple format, or join logical file." />
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<meta name="DC.Relation" scheme="URI" content="joins.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<title>Define a logical file using DDS</title>
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</head>
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<body id="ldef.dita"><a name="ldef.dita"><!-- --></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 logical file using DDS</h1>
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<div><p>A logical file determines how data records are selected and defined
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when read by an application program. A logical file can be a <em>simple</em>, <em>multiple
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format</em>, or <em>join</em> logical file.</p>
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<p>A simple logical file contains one record format and has one file specified
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on the PFILE keyword. A multiple format logical file either contains more
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than one record format or has more than one file specified on the PFILE keyword.
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A join logical file contains one record format and has up to 256 files specified
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on the JFILE keyword.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="simpmult.htm">Simple and multiple format logical files in DDS</a></strong><br />
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You must specify the PFILE keyword at the record level for simple and multiple format logical files. In a multiple format logical file, a record format can use only the fields common to all the physical files specified on the PFILE keyword for that record format.</li>
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<li class="ulchildlink"><strong><a href="joins.htm">Join logical files in DDS</a></strong><br />
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Join logical files combine different fields from more than one physical file into a single record. You must specify the JFILE keyword at the record level for join logical files.</li>
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<li class="ulchildlink"><strong><a href="specrecs.htm">Specify record formats in a logical file in DDS</a></strong><br />
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If there is more than one record format specified in a logical file, you must specify the PFILE keyword for each record format.</li>
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</ul>
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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="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="specrecs.htm" title="If there is more than one record format specified in a logical file, you must specify the PFILE keyword for each record format.">Specify record formats in a logical file in DDS</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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