94 lines
6.6 KiB
HTML
94 lines
6.6 KiB
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<meta name="DC.Title" content="iSeries server and System/38 DDM differences" />
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<meta name="abstract" content="This topic consists of a list of differences between the iSeries server and System/38." />
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<title>iSeries server and System/38 DDM differences</title>
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<body id="rbae5differences38"><a name="rbae5differences38"><!-- --></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="keyword">iSeries server</span> and <span class="keyword">System/38</span> DDM differences</h1>
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<div><p>This topic consists of a list of differences between the <span class="keyword">iSeries™ server</span> and <span class="keyword">System/38™</span>. </p>
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<div class="section"><ul><li>Three parameters are added to the <span class="cmdname">Create DDM File (CRTDDMF)</span> and <span class="cmdname">Change
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DDM File (CHGDDMF)</span> commands. These parameters are the remote location
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name (RMTLOCNAME), local location name (LCLLOCNAME), and the remote network
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ID (RMTNETID). DDM files can be created either in the <span class="keyword">System/38</span> environment
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or on the <span class="keyword">iSeries server</span>.</li>
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<li>The <span class="cmdname">Submit Remote Command (SBMRMTCMD)</span> command must
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be in the syntax of the target server, even in the <span class="keyword">System/38</span> environment.
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For example, when a <span class="keyword">System/38</span> submits
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commands to an <span class="keyword">iSeries server</span>, the
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syntax of the <span class="keyword">iSeries server</span> must
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be used.</li>
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<li>The remote file name must be in the syntax of the target server. </li>
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<li>The default value for the DDMACC parameter on the <span class="cmdname">Change Network
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Attributes (CHGNETA)</span> command on the <span class="keyword">System/38</span> is
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*REJECT. The default value for the DDMACC parameter on the <span class="keyword">iSeries server</span> is
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*OBJAUT.</li>
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<li>On the <span class="keyword">System/38</span>, files
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are created as FIFO (first in, first out) or LIFO (last in, first out). The
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default for creating a file is FIFO on the <span class="keyword">System/38</span>.
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<p>When running <span class="keyword">System/38</span> applications
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that are dependent on duplicate keys being FIFO or LIFO to an <span class="keyword">iSeries server</span>,
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you should specify either FIFO or LIFO when creating your <span class="keyword">iSeries</span> files
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because there is no default for <span class="keyword">iSeries</span> files.
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This means the <span class="keyword">iSeries server</span> looks
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for an available index path to share, which can be either FIFO or LIFO.</p>
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</li>
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<li>Keyed files containing fields other than character (zoned or packed) created
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by using DDM on a remote <span class="keyword">System/38</span> might
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result in the fields defined as character fields. This might produce unexpected
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results when such a file is processed using relative keyed operations. Because
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the file is created with fields that are not packed, records might be returned
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in a different order than expected or no record can be found when one is expected.
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<p>As an example, the ILE RPG SETLL statement might fail unexpectedly with
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record not found or might select a record other than the record expected when
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using packed fields to a <span class="keyword">System/38</span> file.
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Only character and unsigned numeric fields should be used as key fields for
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files that are created by using DDM on the remote <span class="keyword">System/38</span>.</p>
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</li>
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<li>To support adding a record by the relative record number operation, an
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ILE RPG program is required for DDM to do a READ CHAIN(RRN) operation followed
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by a WRITE operation. The file must be opened for read and update authorities,
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and the user must have read and update data authorities to the file. <p>Format
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selector programs on adding a record by the relative record number operation
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are only supported on the <span class="keyword">iSeries server</span>.
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Incompatibilities might arise for those users who have a format selector program
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for a logical file if they do direct file processing.</p>
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</li>
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</ul>
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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="rbae5dif.htm" title="This topic describes the DDM differences between iSeries server and System/36, and iSeries server and System/38.">Use DDM on the iSeries server versus other IBM systems</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="rbae5namecon.htm" title="The rules for specifying the name of a DDM file (on the local iSeries server) are the same as for any other file type on an iSeries server. The rules, however, for specifying the name of a remote file depend on the type of target server.">Rules for specifying target server file names for DDM</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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