80 lines
5.1 KiB
HTML
80 lines
5.1 KiB
HTML
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<title>Specify record formats in a logical file in DDS</title>
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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">Specify record formats in a logical file in DDS</h1>
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<div><p>If there is more than one record format specified in a logical
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file, you must specify the PFILE keyword for each record format.</p>
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<div class="p">There are three ways to specify the fields in a record format: <ul><li>Specify the record format name and the PFILE keyword.</li>
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<li>Specify the record format name, the PFILE or JFILE keyword, and at least
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one individual field.</li>
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<li>Specify the record format name, the PFILE keyword, and the FORMAT keyword.</li>
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</ul>
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</div>
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<p>The <a href="simpmult.htm">Simple and multiple format logical files in DDS</a> topic illustrates the
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three ways to specify fields.</p>
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<div class="p">For each of the three ways to specify fields in a record format, you can
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have one of the following <em>access path</em> specifications: <ul><li>Specify no key fields (arrival sequence access path).<p>You cannot specify
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select/omit fields unless you specify the DYNSLT keyword. You can specify
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only one record format with one physical file on the PFILE keyword for the
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logical file.</p>
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</li>
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<li>Specify one or more key fields (keyed sequence access path). <p>If you
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specify more than one record format in the logical file, each record format
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must have at least one key field specified. You can specify select/omit fields
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for any of the record formats in the file.</p>
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</li>
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<li>Specify the REFACCPTH keyword (keyed sequence access path). <p>The access
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path information from another physical or logical file is copied into the
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file that you are defining.</p>
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</li>
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</ul>
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</div>
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<p>The maximum number of fields in a record format is 8000. If any of the
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fields in the record format are date, time, timestamp, variable length, or
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allows the null value, then the actual maximum number of fields can be less
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than 8000. The maximum number of fields can vary depending on the number of
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fields and combinations of fields that occur within the record format. The
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maximum number of bytes in a record format is 32 766 if variable length fields
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are not included and 32 740 if variable length fields are included.</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="ldef.htm" title="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.">Define a logical file 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="ldef.htm" title="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.">Define a logical file using DDS</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="lleng.htm" title="Use these positions to specify the length of a physical or logical file field.">Length for physical and logical files (positions 30 through 34)</a></div>
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</div>
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</div>
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</body>
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