69 lines
4.3 KiB
HTML
69 lines
4.3 KiB
HTML
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<meta name="DC.Title" content="Temporary result writer job: Disadvantages with DB2 Multisystem" />
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<meta name="abstract" content="The temporary result writer also has disadvantages that must be considered when you determine its usefulness for queries." />
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<title>Temporary result writer job: Disadvantages with DB2 Multisystem</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">Temporary result writer job: Disadvantages with DB2<sup>®</sup> Multisystem</h1>
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<div><p>The temporary result writer also has disadvantages that must be
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considered when you determine its usefulness for queries.</p>
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<p>The disadvantages are:</p>
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<ul><li>The temporary result writer is a separate job. Consequently, it can encounter
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conflicts with the main job, such as: <ul><li>The main job might have the file locked to itself. In this case, the temporary
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result writer cannot access the files and cannot complete its query step.</li>
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<li>The main job might have created the distributed file under commitment
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control and has not yet committed the create. In this case, the temporary
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result writer cannot access the file.</li>
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</ul>
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</li>
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<li>The temporary result writer might encounter a situation
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that it cannot handle in the same way as the main job. For example, if an
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inquiry message is signalled, the temporary result writer might cancel, whereas
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the main job can choose to ignore the message and continue on.</li>
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<li>Temporary result writers are shared by all jobs on the system. If several
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jobs have requests to the temporary result writers, the requests queue up
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while the writers attempt to process them. <div class="note"><span class="notetitle">Note:</span> The system is shipped with
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three, active temporary result writer job pairs.</div>
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</li>
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<li>Attempting to analyze a query (through debug messages, for example) can
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be complicated if a temporary result writer is involved (because a step of
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the query is run in a separate job).</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> The system does not allow the temporary result writer
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to be used for queries running under commitment control *CS or *ALL. This
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is because the main job might have records locked in the file, which can cause
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the temporary result writer to be locked out of these records and not be able
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to finish.</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="tempresult.htm" title="Temporary result writers are system-initiated jobs that are always active.">Temporary result writer with DB2 Multisystem</a></div>
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