53 lines
3.9 KiB
HTML
53 lines
3.9 KiB
HTML
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<meta name="abstract" content="Here are tips and techniques for optimizing the performance of sort sequence tables." />
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<title>Open Query File (OPNQRYF) command: Performance considerations for sort
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sequence tables</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">Open Query File (OPNQRYF) command: Performance considerations for sort
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sequence tables</h1>
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<div><p>Here are tips and techniques for optimizing the performance
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of sort sequence tables.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafooqfpcgrp.htm">Grouping, joining, and selection: Open Query File (OPNQRYF) command performance</a></strong><br />
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When using an existing index, the optimizer ensures that the attributes of the selection, join, and grouping fields match the attributes of the keys in the existing index.</li>
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<li class="ulchildlink"><strong><a href="rbafooqfpcord.htm">Ordering: Open Query File (OPNQRYF) command performance</a></strong><br />
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For ordering fields, the optimizer is not free to use any existing access path. The sort sequence tables associated with the index and the query must match unless the optimizer chooses to do a sort to satisfy the ordering request.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafoopnqf.htm" title="The Open Query File (OPNQRYF) command is a control language (CL) command that allows you to perform many data processing functions on database files. These topics discuss how to create a query using the OPNQRYF command, how to specify parameters for its major functions, and how to use it with your high-level language program.">Use Open Query File (OPNQRYF) command</a></div>
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