66 lines
4.2 KiB
HTML
66 lines
4.2 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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<meta name="DC.Type" content="task" />
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<meta name="DC.Title" content="Data area locking and allocation" />
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<meta name="abstract" content="Locking and allocating a data area helps to ensure that the data area is not accessed by more than one job at a time." />
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<meta name="description" content="Locking and allocating a data area helps to ensure that the data area is not accessed by more than one job at a time." />
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<meta name="DC.Relation" scheme="URI" content="dtaas.htm" />
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<meta name="DC.Relation" scheme="URI" content="objec.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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<meta name="DC.Relation" scheme="URI" content="../cl/dspdtaara.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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<title>Data area locking and allocation</title>
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</head>
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<body id="dalal"><a name="dalal"><!-- --></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">Data area locking and allocation</h1>
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<div><p>Locking and allocating a data area helps to ensure that the data
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area is not accessed by more than one job at a time.</p>
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<div class="section"> <p>The <span class="cmdname">Change Data Area (CHGDTAARA)</span> command uses
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a *SHRUPD (shared for update) lock on the data area during command processing.
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The <span class="cmdname">Retrieve Data Area (RTVDTAARA)</span> and <span class="cmdname">Display
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Data Area (DSPDTAARA)</span> commands use a *SHRRD (shared for read) lock
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on the data area during command processing. If you are performing more than
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one operation on a data area, you may want to use the <span class="cmdname">Allocate Object
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(ALCOBJ)</span> command to prevent other users from accessing the data
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area until your operations are completed. For example, if the data area contains
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a value that is read and incremented by jobs running at the same time, the
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ALCOBJ command can be used to protect the value in both the read and update
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operations.</p>
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<p>For information on handling data areas in other
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(non-CL) languages, refer to the appropriate HLL reference manual.</p>
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</div>
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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="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="objec.htm" title="This provides tasks and concepts specific to objects and libraries, including functions performed on objects, creating libraries, and specifying object authority.">Objects and libraries</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/dspdtaara.htm">Display Data Area (DSPDTAARA) command</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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