87 lines
6.3 KiB
HTML
87 lines
6.3 KiB
HTML
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<meta name="DC.Title" content="Overview of DDM functions" />
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<title>Overview of DDM functions</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">Overview of DDM functions</h1>
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<div><p>This topic gives an overview of the types of DDM functions that
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can be done on a target server.</p>
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<p>The following <em>file</em> operations, normally specified in <strong>HLL programs</strong>,
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can be done on files at target servers:</p>
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<ul><li>Allocating, opening, or closing one or more files.</li>
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<li>Reading, writing, changing, or deleting records in a file.</li>
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</ul>
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<p>The following <em>file</em> and <em>nonfile</em> operations, normally specified
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in <strong>CL programs</strong> or by CL commands, can be done on files at the target
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servers:</p>
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<ul><li>Copying the contents of a file.</li>
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<li>Performing operations on physical or logical file members (such as adding,
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clearing, or removing members), but only if the target is an <span class="keyword">iSeries™ server</span> or <span class="keyword">System/38™</span>.</li>
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<li>Accessing remote <em>files</em> for nondata purposes, such as: <ul><li>Displaying information about one or more files, using commands such as <span class="cmdname">Display
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File Description (DSPFD)</span> and <span class="cmdname">Display File Field Description
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(DSPFFD)</span>. These commands can display the file attributes of the
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DDM file on the source system or the file or field attributes of the remote
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file on the target system.</li>
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<li>Controlling the locking of files on the target system, using the <span class="cmdname">Allocate
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Object (ALCOBJ)</span> and <span class="cmdname">Deallocate Object (DLCOBJ)</span> commands.</li>
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<li>Deleting, renaming, creating, and changing files using the <span class="cmdname">Delete
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File (DLTF)</span>, <span class="cmdname">Rename Object (RNMOBJ)</span>, <span class="cmdname">Create
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Physical File (CRTPF)</span>, <span class="cmdname">Create Source Physical File (CRTSRCPF)</span>, <span class="cmdname">Create
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Logical File (CRTLF)</span>, <span class="cmdname">Change Physical File (CHGPF)</span>, <span class="cmdname">Change
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Logical File (CHGLF)</span>, and <span class="cmdname">Change Source Physical File (CHGSRCPF)</span> commands.</li>
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</ul>
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</li>
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<li>Accessing remote <em>systems</em> for non-data purposes: <ul><li>Send a CL command to the target system (an <span class="keyword">iSeries server</span> and
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a <span class="keyword">System/38</span> only) so it can
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be run there, instead of on the source system (where it might not be useful
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to run it), using the <span class="cmdname">Submit Remote Command (SBMRMTCMD)</span> command.
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The <span class="cmdname">SBMRMTCMD</span> command is the method you use to move, save,
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or restore files on a target server. For example, a <span class="cmdname">Move Object (MOVOBJ)</span> command
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might be sent to move a database file on the target server. (For typical uses
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of the <span class="cmdname">SBMRMTCMD</span> command, refer to its description in Use
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CL and DDS with DDM or refer to the CL topic for a more complete description.)</li>
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</ul>
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</li>
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</ul>
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<p>Various other nonfile-related operations can also be done
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on the target server.</p>
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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="../rbam6/rbam6clmain.htm">Control language</a></div>
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<div><a href="rbae5cldsp.htm" title="This topic contains DDM-related information about specific iSeries control language (CL) commands, data description specifications (DDS) considerations, DDS keywords, and DDM user profile authority.">Use CL and DDS with DDM</a></div>
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</div>
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</div>
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</body>
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