91 lines
5.5 KiB
HTML
91 lines
5.5 KiB
HTML
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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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Local data area" />
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<meta name="abstract" content="A local data area is created for each job in the system, including autostart jobs, jobs started on the system by a reader, and subsystem monitor jobs." />
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<meta name="description" content="A local data area is created for each job in the system, including autostart jobs, jobs started on the system by a reader, and subsystem monitor jobs." />
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<meta name="DC.subject" content="local data area, LDA (local data area), *LDA value, local" />
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<meta name="DC.Relation" scheme="URI" content="dtaas.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/crtdtaara.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/rtvdtaara.htm" />
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<title>Local data area</title>
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<body id="lclda"><a name="lclda"><!-- --></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">Local data area</h1>
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<div><p>A local data area is created for each job in the system, including
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autostart jobs, jobs started on the system by a reader, and subsystem monitor
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jobs.</p>
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<p>The system creates a local data area, which is initially filled with blanks,
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with a length of 1024 and type *CHAR. When you submit a job using the SBMJOB
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command, the value of the submitting job's local data area is
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copied into the submitted job's local data area. You can refer to your job's
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local data area by specifying *LDA for the DTAARA keyword on the CHGDTAARA,
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RTVDTAARA, and DSPDTAARA commands or *LDA for the substring built-in function
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(%SST).</p>
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<p>The following is true of a local data area: </p>
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<ul><li>The local data area cannot be referred to from any other job.</li>
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<li>You cannot create, delete, or allocate a local data area.</li>
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<li>No library is associated with the local data area.</li>
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<li>You cannot change the local data area in a secondary thread.</li>
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<li>The ILE CL compiler generates code to ensure that a procedure running
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in a secondary thread cannot access the local data area while a procedure
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running in the initial thread is changing it.</li>
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</ul>
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<p>The local data area contents exist across routing step boundaries. Therefore,
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using a <span class="cmdname">Transfer Job (TFRJOB)</span>, <span class="cmdname">Transfer Batch
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Job (TFRBCHJOB)</span>, <span class="cmdname">Reroute Job (RRTJOB)</span>, or <span class="cmdname">Return
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(RETURN)</span> command does not affect the contents of the local data
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area.</p>
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<p>You can use the local data area to: </p>
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<ul><li>Pass information to a procedure or program without the use of a parameter
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list.</li>
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<li>Pass information to a submitted job by loading your information into the
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local data area and submitting the job. Then, you can access the data from
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within your submitted job.</li>
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<li>Improve performance over other types of data area accesses from a CL procedure
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or program.</li>
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<li>Store information without the overhead of creating and deleting a data
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area yourself.</li>
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</ul>
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<p>Most high-level languages can also use the local data area. The SBMxxxJOB
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and STRxxxRDR commands cause jobs to start with a local data area initialized
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to blanks. Only the SBMJOB command allows the contents of the submitting
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job's local data area to be passed to the new job.</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="dtaas.htm" title="A data area is an object used to hold data for access by any job running on the system.">Use data areas</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/crtdtaara.htm">Create Data Area (CRTDTAARA) command</a></div>
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<div><a href="../cl/rtvdtaara.htm">Retrieve Data Area (RTVDTAARA) command</a></div>
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<div><a href="../cl/chgdtaara.htm">Change Data Area (CHGDTAARA) command</a></div>
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<div><a href="../cl/dspdtaara.htm">Display Data Area (DSPDTAARA) command</a></div>
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<div><a href="../cl/dltdtaara.htm">Delete Data Area (DLTDTAARA) command</a></div>
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</div>
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</div>
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</body>
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</html> |