55 lines
3.3 KiB
HTML
55 lines
3.3 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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="dc.language" scheme="rfc1766" 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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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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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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<title>Communications performance considerations for batch jobs</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzajtper-combatchjobsin"></a>
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<h4 id="rzajtper-combatchjobsin">Communications performance considerations for batch jobs</h4>
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<p>Each piece of work run on the iSeries™ system is called a job. Each job
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is a single, identifiable sequence of processing actions that represents a
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single use of the system. The basic types of jobs that are performed are interactive
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jobs, batch jobs, spooling jobs, autostart jobs, and prestart jobs.</p>
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<p>Batch jobs are predefined groups of processing actions that are submitted
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to the system to be performed with little or no interaction between the user
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and the system. Batch jobs can be tuned for optimized performance.</p>
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<p>To optimize batch jobs for communications, consider the following:</p>
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<ul>
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<li>Break the application into pieces and having multiple batch threads (jobs)
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operate concurrently.</li>
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<li>Reduce the number of open and close operations, input and output operations.</li>
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<li>If you have a considerable amount of main storage available, consider
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using the Set Object Access (SETOBJACC) command. This command preloads the
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complete database file, database index, or program into the assigned main
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storage pool if sufficient storage is available. The objective is to improve
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performance by eliminating disk-read/write operations.</li>
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<li>Try to limit the number of communications input and output operations
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by doing fewer (and perhaps larger) application sends and receives when communications
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lines are used.</li>
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<li>Block the data in the application. Try to place the application on the
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same system as the frequently accessed data.</li></ul>
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<p>For more information about batch job performance, see the <a href="../books/sc415406.pdf" target="_blank">Communications Management</a>
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<img src="wbpdf.gif" alt="Link to PDF" /> book.</p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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