77 lines
5.7 KiB
HTML
77 lines
5.7 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="DC.Type" content="concept" />
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<meta name="DC.Title" content="Input spooling" />
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<meta name="abstract" content="Input spooling takes the information from the input device, prepares the job for scheduling, and places an entry in a job queue. Using input spooling, you can typically shorten job run time, increase the number of jobs that can be run sequentially, and improve device throughput." />
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<meta name="description" content="Input spooling takes the information from the input device, prepares the job for scheduling, and places an entry in a job queue. Using input spooling, you can typically shorten job run time, increase the number of jobs that can be run sequentially, and improve device throughput." />
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<meta name="DC.Relation" scheme="URI" content="rzatakickoff.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzakssplfileinput" />
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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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<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>Input spooling</title>
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</head>
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<body id="rzakssplfileinput"><a name="rzakssplfileinput"><!-- --></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">Input spooling</h1>
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<div><p>Input spooling takes the information from the input device, prepares
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the job for scheduling, and places an entry in a job queue. Using input spooling,
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you can typically shorten job run time, increase the number of jobs that can
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be run sequentially, and improve device throughput.</p>
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<p>The main elements of input spooling are:</p>
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<ul><li><strong>Job queue</strong>: An ordered list of batch jobs submitted to the server
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for running and from which batch jobs are selected to run.</li>
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<li><strong>Reader</strong>: A function that takes jobs from an input device or database
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file and places them on a job queue.</li>
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</ul>
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<p>When a batch job is read from an input source by a reader, the commands
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in the input stream are stored in the server as requests for the job, the
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inline data is spooled as inline data files, and an entry for the job is placed
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on a job queue. The job information remains stored in the server where it
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was placed by the reader until the job entry is selected from the job queue
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for processing by a subsystem.</p>
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<div class="p"><div class="fignone" id="rzakssplfileinput__RSLH145"><a name="rzakssplfileinput__RSLH145"><!-- --></a><span class="figcap">Figure 1. Relationship of Input Spooling Elements</span><img src="rslh145.gif" alt="Relationship of Input Spooling Elements" /></div>
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</div>
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<p>You can use the reader functions to read an input stream from diskette
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or database files.</p>
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<div class="p"><div class="fignone" id="rzakssplfileinput__RSLH116"><a name="rzakssplfileinput__RSLH116"><!-- --></a><span class="figcap">Figure 2. Typical Organization of an Input Stream</span><img src="rslh116.gif" alt="Typical Organization of an Input
Stream" /></div>
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</div>
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<div class="p">The job queue on which the job is placed is specified on the <span class="parmname">JOBQ</span> parameter
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on the Batch Job <span class="cmdname">BCHJOB</span> command, on the Start Database
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Reader<span class="cmdname">STRDBRDR</span> command, or in the job description. If the <span class="parmname">JOBQ</span> parameter
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on the <span class="cmdname">BCHJOB</span> command is:<ul><li>*RDR: The job queue is selected from the JOBQ parameter on the Start database
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reader (<span class="cmdname">STRDBRDR</span>) command.</li>
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<li>*JOBD: The job queue is selected from the JOBQ parameter in the job description.</li>
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<li>A specific job queue: The specified queue is used.</li>
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</ul>
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</div>
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<p>For jobs with small input streams, you might improve server performance
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by not using input spooling. The Submit Job (<span class="cmdname">SBMJOB</span>) command
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reads the input stream and places the job on the job queue in the appropriate
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subsystem, bypassing the spooling subsystem and reader operations.</p>
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<p>If your job requires a large input stream to be read, you should use input
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spooling (Start Diskette Reader <span class="cmdname">STRDKTRDR</span> or Start Database
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Reader<span class="cmdname">STRDBRDR</span> command) to allow the job to be input independent
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of when the job is actually processed.</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="rzatakickoff.htm" title="Spooling is a system function that saves data for later processing or printing. This data is stored in a spooled file. Spooled files work in a similar manner to tape files or other device files. Spooled files allow you to manage your data targeted for externally attached devices such as a printer.">Spooled files</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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