71 lines
5.3 KiB
HTML
71 lines
5.3 KiB
HTML
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Query/38 optimization for DDM" />
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<meta name="abstract" content="Query/38 has an optimization function, but because it causes i5/OS database query to be used, the feature cannot be used when the query is performed against a remote file that is not on an iSeries server or a System/38." />
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<meta name="DC.subject" content="command, Create Query Definition (CRTQRYDEF), command, Create Query Application (CRTQRYAPP), Design Query Application (DSNQRYAPP)" />
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<meta name="keywords" content="command, Create Query Definition (CRTQRYDEF), command, Create Query Application (CRTQRYAPP), Design Query Application (DSNQRYAPP)" />
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<title>Query/38 optimization for DDM</title>
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</head>
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<body id="rbae5optmize"><a name="rbae5optmize"><!-- --></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">Query/38 optimization for DDM</h1>
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<div><p>Query/38 has an optimization function, but because it causes <span class="keyword">i5/OS™</span> database query to be used,
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the feature cannot be used when the query is performed against a remote file
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that is not on an <span class="keyword">iSeries™ server</span> or
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a <span class="keyword">System/38™</span>.</p>
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<div class="section"><p>Because <span class="keyword">i5/OS</span> database
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query does not exist on non-<span class="keyword">iSeries server</span>s
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or non-<span class="keyword">System/38</span>s, the optimization
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function cannot be used by the source <span class="keyword">iSeries server</span> when
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performing a query against a non-<span class="keyword">iSeries</span> or
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a non-<span class="keyword">System/38</span> remote file.</p>
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</div>
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<div class="section"><p>Therefore, when a Query/38 application is being created or changed
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that accesses a remote file on a non-<span class="keyword">iSeries server</span> or
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a non-<span class="keyword">System/38</span>, the OPTIMIZE
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parameter on the <span class="cmdname">Create Query Application (CRTQRYAPP)</span>, <span class="cmdname">Create
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Query Definition (CRTQRYDEF)</span>, or <span class="cmdname">Change Query Definition
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(CHGQRYDEF)</span> command must be changed to *NO. Specifying OPTIMIZE(*NO)
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forces Query/38 to read the file sequentially, which can be done with non-<span class="keyword">iSeries</span> target files. If the default
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of *YES is used, an error occurs when the Query/38 application is run.</p>
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</div>
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<div class="section"><p>Similarly, if the <span class="cmdname">Design Query Application (DSNQRYAPP)</span> command
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is used to create and run queries that are to be performed on a non-<span class="keyword">iSeries</span> target file, the <em>Optimize
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Query</em> prompt on the Application Creation display must be changed from
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Y to N.</p>
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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="rbae5sys38tools.htm" title="The topic collection describes the System/38-compatible data file utility (DFU/38) and the System/38-compatible query utility (Query/38).">System/38-compatible database tools</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="rbae5nqueryx.htm" title="This example shows how to create a local file and use it to define the data that is to be queried in a non-iSeries or non-System/38 remote file.">Non-iSeries or non-System/38 Query/38 example</a></div>
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<div><a href="rbae5dbquery.htm" title="The database interactive query function, provided by the i5/OS licensed program, supports DDM files.">i5/OS database query</a></div>
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</div>
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</div>
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