60 lines
3.7 KiB
HTML
60 lines
3.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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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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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Performance considerations" />
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<meta name="abstract" content="The retrieve APIs allow you to control the performance cost for information you retrieve." />
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<meta name="description" content="The retrieve APIs allow you to control the performance cost for information you retrieve." />
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<meta name="DC.Relation" scheme="URI" content="concept.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/qusrjobi.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="conPerformance" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Performance considerations</title>
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</head>
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<body id="conPerformance"><a name="conPerformance"><!-- --></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">Performance considerations</h1>
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<div><p>The retrieve APIs allow you to control the performance cost for
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information you retrieve.</p>
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<p>The format specified for any API influences the performance cost of the
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API. In general, when more information is returned, the performance is slower.</p>
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<p>Some list APIs, such as list jobs, list spooled files, and list objects,
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generate the list with minimal cost. This is why these formats do not retrieve
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very much information. Some of the APIs, such as list record formats and list
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fields, have only one format, because there is no additional performance cost
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to supply the complete information.</p>
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<p>The retrieve APIs, such as retrieve member description and retrieve spooled
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file attributes, have formats that are generally ordered from fastest performance
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to slowest performance. That is, the lower numbered formats run faster but
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retrieve less information, and the higher numbered formats run slower but
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retrieve more information. One exception is the Retrieve Job Information (QUSRJOBI)
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API where the order of the formats does not have anything to do with performance
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characteristics. For more information about the performance characteristics
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for the QUSRJOBI API formats, see the Retrieve Job Information (QUSRJOBI)
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API in Work Management APIs.</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="concept.htm" title="Describes the underlying concepts that you need to understand to work effectively with APIs. Among the concepts covered are basic concepts, programming considerations, and terminology.">API concepts</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="../apis/qusrjobi.htm">Retrieve Job Information (QUSRJOBI) API</a></div>
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</div>
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</div>
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</body>
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</html>
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