71 lines
4.7 KiB
HTML
71 lines
4.7 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Parts of DDM: Target DDM" />
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<meta name="abstract" content="A target server job is started on the target (or remote) server as a result of an incoming DDM request and ends when the associated DDM conversation ends." />
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<meta name="DC.subject" content="parts of DDM, target DDM (TDDM), DDM, parts of, program start request" />
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<title>Parts of DDM: Target DDM</title>
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</head>
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<body id="rbae5parttddm"><a name="rbae5parttddm"><!-- --></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">Parts of DDM: Target DDM</h1>
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<div><p>A target server job is started on the target (or remote) server
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as a result of an incoming DDM request and ends when the associated DDM conversation
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ends.</p>
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<p>The target DDM (TDDM) translates DDM requests for remote file
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access into data management requests on the target server and then handles
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the return of the information that is to be sent to the source server.</p>
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<p>The TDDM is started when the remote server sends a program start request.
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The TDDM is started as a batch job on the target server. After the TDDM is
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started and a DDM conversation is established, the TDDM waits for a request
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(such as a file open or read operation, or a nonfile-related operation) to
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be sent by the SDDM.</p>
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<p>When the TDDM receives a request to access an object on the target server,
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it searches for the requested object. If the object was not qualified with
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a library or path name, the current library list or current directory for
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the target job is searched.</p>
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<p>When the requested object is found, the TDDM passes the first operation
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requested to database or folder management on the target server, which performs
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the operation on the object. When the operation is completed, database or
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folder management services return the results of the operation to the TDDM,
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which passes it to the SDDM. The SDDM passes the results and any accompanying
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data (such as records requested on a read operation) to the application program.
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These actions are repeated for each subsequent I/O operation request received,
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until the object is closed. If an operation does not complete successfully,
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the SDDM returns an error message to the program, providing information about
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the error.</p>
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<p>The TDDM and the target job remain active until the DDM conversation is
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ended by the source server job that started it. </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="rbae5partsofddm.htm" title="DDM consists of several parts to handle remote file processing among the systems using DDM.">Parts of 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="rbae5xs3xtgt.htm" title="The iSeries target DDM (or TDDM) is actually a job that runs a DDM-related target server program. It is started when the source server sends a program start request (an SDDM).">iSeries server as the target server for DDM</a></div>
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</div>
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</div>
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</body>
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