54 lines
3.1 KiB
HTML
54 lines
3.1 KiB
HTML
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<title>Example 2: Control how the system runs the Open Query File command</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">Example 2: Control how the system runs the Open Query File command</h1>
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<div><p>This example shows how to optimize to minimize the number of records
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read.</p>
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<div class="section"><div class="p">Assume that you have multiple programs that will access the same
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file which is built by the Open Query File (OPNQRYF) command. In this case,
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you will want to optimize the performance so that the application programs
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read only the data they are interested in. This means that you want OPNQRYF
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to perform the selection as efficiently as possible. You can specify: <pre>OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) QRYSLT('CODE *EQ "B"') +
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KEYFLD(CUST) OPTIMIZE(*MINWAIT)
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CALL PGM(PGMA)
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POSDBF OPNID(FILEA) POSITION(*START)
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CALL PGM(PGMB)
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafosropn.htm" title="The optimization function allows you to specify how you are going to use the results of the query.">Control how the system runs the Open Query File (OPNQRYF) command</a></div>
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