85 lines
6.5 KiB
HTML
85 lines
6.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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<meta name="DC.Title" content="DDM architecture-related restrictions" />
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<meta name="abstract" content="The items listed in this topic are DDM architecture-related restrictions. Therefore, application programs that use these items might have to be changed and recompiled before they can access remote files." />
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<meta name="DC.subject" content="DDM architecture, restrictions, system, iSeries, multiformat logical file, multiformat logical file, logical file, multiformat logical files, command, Change End of File (CHGEOF), command, DDM, CHGEOF (Change End of File), Lock Data Stream (LCKSTR), LCKSTR (Lock Data Stream), personal computer, generic name" />
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<meta name="DC.Relation" scheme="URI" content="rbae5commit.htm" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>DDM architecture-related restrictions</title>
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</head>
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<body id="rbae5archres"><a name="rbae5archres"><!-- --></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">DDM architecture-related restrictions</h1>
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<div><p>The items listed in this topic are DDM architecture-related restrictions.
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Therefore, application programs that use these items might have to be changed
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and recompiled before they can access remote files. </p>
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<div class="section"><ul><li>The DDM architecture does not support <span class="keyword">iSeries™</span> multi-format
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logical files. However, because multi-format logical files are supported as
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an <span class="keyword">System/38™</span> extension to the
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DDM architecture, they can be used with DDM, but only if the source and target
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servers are <span class="keyword">iSeries server</span>s or <span class="keyword">System/38</span>s.</li>
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<li>Externally described data (using data description specifications [DDS]
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on an <span class="keyword">iSeries server</span>) is not supported
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by the DDM architecture. However, DDS can still be used, especially if both
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systems are <span class="keyword">iSeries server</span>s or <span class="keyword">System/38</span>s. If the target server is an <span class="keyword">iSeries server</span> or a <span class="keyword">System/38</span>,
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most of the DDS support can be used as though the remote file is a local file. </li>
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<li>To access folder management services objects, the source server must support
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Level 2.0 or Level 3.0 of the DDM architecture for stream files and the stream
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access method. The following restrictions for the byte stream model apply:
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<ul><li>WAIT time is not supported by the folder management services on the<span class="cmdname"> Lock
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Data Stream (LCKSTR)</span> command. The user must handle the waiting function
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on the source server.</li>
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<li>The <span class="cmdname">Copy File (CPYFIL)</span> command used to copy a document
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on an <span class="keyword">iSeries server</span> is supported
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with the restrictions.
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Only the header information is copied; no data is copied.</li>
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<li>The DELDRCOP (DRCALL) parameter is not supported on the <span class="cmdname">Delete
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Directory (DELDRC)</span> command.</li>
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</ul>
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</li>
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<li>Personal computer generic names are not allowed when performing operations
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on data management objects such as files, libraries, or members. However,
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generic names are allowed when performing operations on folder management
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services objects such as documents and folders. Generic names are supported
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where the personal computer supports the operation and in the manner that
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the personal computer supports the operation. For example, generic names are
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not supported for folders using the rename and delete commands because the
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personal computer does not support them.</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="rbae5compile.htm" title="Remote files can be accessed by iSeries application programs written in the HLL and control language.">Program modification requirements for DDM</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="rbae5commit.htm" title="iSeries applications can commit or roll back transactions on remote iSeries servers.">Commitment control support for DDM</a></div>
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<div><a href="rbae5ddsinfo.htm" title="Data description specifications (DDS), which is used to externally describe the fields and record formats, can also be used with DDM to describe the file and record formats of a remote file.">Data description specifications considerations for DDM</a></div>
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<div><a href="rbae5ddmcom.htm" title="This topic classifies DDM commands and parameters.">DDM commands and parameters</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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