123 lines
7.9 KiB
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123 lines
7.9 KiB
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<meta name="DC.Title" content="CRTDDMF (Create DDM File) considerations" />
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<meta name="abstract" content="For applications running on an iSeries server to access remote files, the programmer must use the CRTDDMF command to create an object called a DDM file." />
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<body id="rbae5crtddmfcon"><a name="rbae5crtddmfcon"><!-- --></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"><span class="cmdname">CRTDDMF (Create DDM File)</span> considerations</h1>
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<div><p>For applications running on an <span class="keyword">iSeries™</span> server
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to access remote files, the programmer must use the <span class="cmdname">CRTDDMF</span> command
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to create an object called a DDM file.</p>
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<div class="section"><p>The ACCMTH parameter of this command shows which DDM access method
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should be used when opening the remote file. If *RMTFILE is used, <span class="keyword">i5/OS™</span> DDM selects an access method
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that is compatible with: </p>
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<ul><li>The type of VSAM data set being accessed</li>
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<li>The access methods supported by CICS/DDM for the VSAM data set</li>
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</ul>
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</div>
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<div class="section"><p>The table below shows how the possible values for the ACCMTH parameter
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correspond to VSAM data sets. </p>
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</div>
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<div class="tablenoborder"><a name="rbae5crtddmfcon__rbae5figacc"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rbae5crtddmfcon__rbae5figacc" width="100%" frame="border" border="1" rules="all"><caption>Table 1. ACCMTH parameter
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of <span class="keyword">iSeries</span> <span class="cmdname">CRTDDMF</span> command</caption><thead align="left"><tr><th rowspan="2" align="left" valign="bottom" width="20%" id="d0e89">ACCMTH parameter values</th>
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<th colspan="4" align="center" valign="bottom" id="d0e91">VSAM data
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set organization</th>
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</tr>
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<tr><th align="left" valign="bottom" width="20%" id="d0e94">ESDS</th>
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<th align="left" valign="bottom" width="20%" id="d0e96">RRDS</th>
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<th align="left" valign="bottom" width="20%" id="d0e98">KSDS</th>
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<th align="left" valign="bottom" width="20%" id="d0e100">VSAM Path</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="20%" headers="d0e89 ">*ARRIVAL</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e94 ">R</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e96 ">R</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e98 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e100 ">E</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e89 ">*KEYED</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e94 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e96 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e98 ">R</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e100 ">R</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e89 ">*BOTH</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e94 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e96 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e98 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e100 ">O</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e89 ">*RANDOM</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e94 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e96 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e98 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e100 ">O</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e89 ">*SEQUENTIAL</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e94 ">R</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e96 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e98 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e100 ">O</td>
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</tr>
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<tr><td align="left" valign="top" width="20%" headers="d0e89 ">*COMBINED</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e94 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e96 ">O</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e98 ">E</td>
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<td align="left" valign="top" width="20%" headers="d0e91 d0e100 ">E</td>
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</tr>
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<tr><td colspan="5" align="left" valign="top" headers="d0e89 d0e91 d0e94 d0e96 d0e98 d0e100 "><div class="p">Where: <dl><dt class="dlterm">R</dt>
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<dd>Shows the parameter is required for accessing the VSAM data set.</dd>
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<dt class="dlterm">O</dt>
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<dd>Shows the parameter is optional for accessing the VSAM data set.</dd>
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<dt class="dlterm">E</dt>
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<dd>Shows the parameter causes an <span class="keyword">i5/OS</span> message.</dd>
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</dl>
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</div>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><p>To improve performance, the <span class="keyword">iSeries</span> user
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might want to supply values other than *RMTFILE for the ACCMTH
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parameter. To avoid server messages, use the values specified in <a href="#rbae5crtddmfcon__rbae5figacc">Table 1</a> when
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accessing remote VSAM data sets.</p>
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</div>
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<div class="section"><p>The value specified for the RMTFILE file parameter must be the
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same as the value specified for the DATASET parameter of the CICS<sup>®</sup> DFHFCT macro
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when the VSAM data set is defined to the CICS system.</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="rbae5lulp.htm" title="The iSeries languages, utilities, and licensed programs in this topic can access remote CICS files.">iSeries languages, utilities, and licensed programs</a></div>
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</div>
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</div>
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</body>
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