60 lines
3.8 KiB
HTML
60 lines
3.8 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Comparisons with using database files as queues" />
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<meta name="abstract" content="This describes the differences between using data queues and using database files." />
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<meta name="description" content="This describes the differences between using data queues and using database files." />
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<meta name="DC.subject" content="database file, using as data queue, performance, data queue advantage, consideration, message queue" />
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<meta name="keywords" content="database file, using as data queue, performance, data queue advantage, consideration, message queue" />
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<meta name="DC.Relation" scheme="URI" content="qcomm.htm" />
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<meta name="DC.Relation" scheme="URI" content="mangq.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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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Comparisons with using database files as queues</title>
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</head>
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<body id="compq"><a name="compq"><!-- --></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">Comparisons with using database files as queues</h1>
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<div><p>This describes the differences between using data queues and using
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database files.</p>
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<ul><li>Data queues have been improved to communicate between active procedures
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and programs, not to store large volumes of data or large numbers of entries.
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For these purposes, use database files as queues.</li>
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<li>Data queues should not be used for long-term storage of data. For this
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purpose, you should use database files.</li>
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<li>When using data queues, you should include abnormal end routines in your
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programs to recover any entries not yet completely processed before the system
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is ended.</li>
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<li>It is good practice to periodically (such as once a day) delete and recreate
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a data queue at a safe point. Performance can be affected if too many entries
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exist without being removed. Recreating the data queue periodically will return
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the data queue to its optimal size. A more efficient approach may be to use
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the auto reclaim feature.</li>
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</ul>
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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="qcomm.htm" title="Data queues are a type of system object that you can create, to which one HLL procedure or program can send data, and from which another HLL procedure or program can receive data.">Use data queues</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="mangq.htm" title="Because smaller data queues have better performance than large ones, it's important to manage the size of the storage allocated to a data queue.">Manage the storage used by a data queue</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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