110 lines
6.6 KiB
HTML
110 lines
6.6 KiB
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<meta name="abstract" content="The LABEL parameter specifies the data file identifier of the data file on tape used in input and output operations." />
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<title>LABEL parameter</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">LABEL parameter</h1>
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<div><p>The LABEL parameter specifies the data file identifier of the data
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file on tape used in input and output operations.</p>
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<div class="section"><p>The data file can be in either the exchange format or the save/restore
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format.</p>
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<div class="note"><span class="notetitle">Note:</span> The device file commands are used for tapes that are in the
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exchange format only, <em>not</em> for those in the save/restore format; user-defined
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device files are not used in save/restore operations. </div>
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<p>Each data
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file on tape has its data file identifier stored in its own file label. The
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data file label (or header label) of each data file is stored on the tape
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just before the data in the file. That is, each file on the tape has its own
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header label and its own data records together as a unit, and one file follows
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another. In addition to the data file identifier, each label also contains
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other information about the file, such as the file sequence number, record
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and block attributes, and whether it is a multivolume data file.</p>
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<p>Generally,
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the data file identifier is an alphanumeric character string that contains
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no more than 8 characters. However, the maximum length actually depends on
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several things: what data format is used for the files and CL commands in
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which the identifiers are specified. The unused portion of the file identifier
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field should be left blank.</p>
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<p>The first character of the data file identifier
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must be alphabetic (A through Z, $, #, or @) and the rest of the characters
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<em>should</em> be alphanumeric (A through Z, 0 through 9, $, #, _, .,
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and @). You can use special characters if the identifier is enclosed in apostrophes.
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However, if the tape is used on a system other than an iSeries™ system,
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the requirements for specifying identifiers on that system must be considered.
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</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Tape data file identifiers</h4><p>Tape data file identifiers
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can have as many as 17 characters. However, if a tape is used on a system
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other than an iSeries system,
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a maximum of 8 characters, or a qualified identifier of no more than 17 characters,
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should be used. If more than 8 characters are used, the identifier should
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be qualified and enclosed in apostrophes so that no more than 8 characters
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occur in either part, and the parts are separated by a period; for example,
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LABEL('TAXES.JAN1980'). This limitation applies to the following commands: <span class="cmdname">Create
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Tape File (CRTTAPF)</span>, <span class="cmdname">Change Tape File (CHGTAPF)</span>, <span class="cmdname">Override
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Tape File (OVRTAPF)</span>, and <span class="cmdname">Display Tape (DSPTAP)</span>.</p>
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<p>The
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data file identifier is put on the volume when the data file is put on the
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volume. For input/output operations, the identifier can be specified in one
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of tape device file commands, or it can be passed as a parameter when the
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device file is opened by the high-level language program that uses the file. </p>
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</div>
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<div class="section"><h4 class="sectiontitle">Save/Restore format</h4><p>For tapes in the save/restore
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format, the identifier can have a maximum of 17 characters. If a library name
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is used to generate the label, the identifier cannot exceed 10 characters.
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You may specify a label other than a library name.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Values allowed</h4><p>One of the following values can be
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specified for the LABEL parameter, depending upon the command.</p>
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<dl><dt class="dlterm">*ALL</dt>
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<dd>Labels for all the data file identifiers in the specified tape volumes
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are shown on the display. </dd>
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<dt class="dlterm">*NONE</dt>
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<dd>The data file identifier is not specified. It must be supplied before
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the device file (and/or database file) is opened to be used in the tape operation. </dd>
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<dt class="dlterm">*SAME</dt>
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<dd> The data file identifier already present in the tape device file does
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not change. </dd>
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<dt class="dlterm"><var class="varname">data-file-identifier</var></dt>
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<dd>Specify the identifier of the data file used or displayed with the device
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file description.</dd>
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<dt class="dlterm">*LIB</dt>
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<dd>The file label is created by the system and the name of the library specified
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on the LIB parameter is used as the qualifier for the file name.</dd>
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<dt class="dlterm">*SAVLIB</dt>
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<dd> The file label is created by the system, and the name of the library
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specified on the SAVLIB parameter is used as the qualifier for the file name.</dd>
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</dl>
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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="rbam6expand.htm" title="This section contains the expanded descriptions of some of the parameters commonly used in the CL commands.">Commonly used parameters</a></div>
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</div>
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