77 lines
6.4 KiB
HTML
77 lines
6.4 KiB
HTML
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<title>Basic DDM concepts</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">Basic DDM concepts</h1>
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<div><p>This topic collection gives the basic concepts of DDM.</p>
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<p>Because remote file processing is much like local file processing, these
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topics should provide sufficient conceptual information for most users of
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DDM. Another topic provides additional, more detailed concepts, and the topic
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Additional DDM concepts is intended primarily for the experienced programmer
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who wants or needs to know more about DDM.</p>
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<p>From an user's viewpoint, accessing data on a remote system is much the
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same as accessing data on the local system. The main difference is the additional
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time needed for the data link to pass the data between the systems whenever
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the remote file is accessed. Otherwise, the user or application program does
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not need to know whether the data being accessed came from a local or remote
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file. Refer to Performance considerations for DDM for additional considerations.</p>
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<p>For DDM <span class="keyword">iSeries™</span>-to-<span class="keyword">iSeries</span> file processing, remote file
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processing is done much the same as local file processing. The purpose of
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this topic collection is to describe the things that are different for DDM.
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Also, because other systems can use DDM, those considerations and concepts
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are covered as needed to enable the <span class="keyword">iSeries</span> programmer
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to successfully prepare the server for using DDM.</p>
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<p>The DDM concepts in these topics describe mainly <span class="keyword">iSeries</span>-to-<span class="keyword">iSeries</span> remote
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file processing. For purposes of illustration, concepts that relate to <span class="keyword">System/36™</span> and <span class="keyword">System/38™</span> are
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shown in some examples. If you are using DDM on both <span class="keyword">System/36</span>s
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and <span class="keyword">iSeries</span> servers, you should
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be aware that the concepts for both types are similar, except in the way they
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point to the remote file: An <span class="keyword">iSeries</span> server
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and a <span class="keyword">System/38</span> use a separate <dfn class="term">DDM
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file</dfn> to refer to each remote file to be accessed; <span class="keyword">System/36</span> uses
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a network resource directory that contains one <dfn class="term">network resource directory
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entry</dfn> for each remote file to be accessed.</p>
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<div class="note"><span class="notetitle">Note:</span> Although DDM supports other functions besides opening and accessing
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remote files, the concepts described in this topic collection deal primarily
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with remote file accessing.</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="rbae5intrdf.htm" title="This topic describes the purpose of distributed data management (DDM), the functions that DDM supplies on the iSeries server, and the concepts of i5/OS DDM.">Introduction to i5/OS DDM</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="rbae5advcncp.htm" title="Most users of DDM will not need the information in the remainder of these topics; it is intended primarily for experienced programmers who need to know more about DDM.">Additional DDM concepts</a></div>
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<div><a href="rbae5perfcon.htm" title="These topics provide information to help you improve performance when using DDM and also provide some information about when to use something other than DDM to accomplish some functions.">Performance considerations for DDM</a></div>
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</div>
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</div>
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