79 lines
5.5 KiB
HTML
79 lines
5.5 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="concept" />
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<meta name="DC.Title" content="Journal object limit" />
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<meta name="abstract" content="The journal object limit (JRNOBJLMT) parameter allows you to set the maximum number of objects that will be allowed to be journaled to the journal." />
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<meta name="description" content="The journal object limit (JRNOBJLMT) parameter allows you to set the maximum number of objects that will be allowed to be journaled to the journal." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Identifier" content="journalobjectlimit" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Journal object limit</title>
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</head>
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<body id="journalobjectlimit"><a name="journalobjectlimit"><!-- --></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">Journal object limit</h1>
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<div><p>The journal object limit (JRNOBJLMT) parameter allows you to set
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the maximum number of objects that will be allowed to be journaled to the
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journal. </p>
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<p><img src="./delta.gif" alt="Start of change" />The journaled object limit is the maximum number of objects
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that can be journaled to one journal. You can set the journal object limit
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to either 250,000 or 10,000,000. Use the Journal Object Limit (JRNOBJLMT)
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parameter on the Create Journal (CRTJRN) or Change Journal (CHGJRN) command
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to set the maximum number of journaled objects.<img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />The value *MAX10M can only be specified for the Journal Object
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Limit (JRNOBJLMT) parameter if the Receiver Size Option (RCVSIZOPT) parameter
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has one of the receiver maximum values specified, or if RCVSIZOPT is *SYSDFT.<img src="./deltaend.gif" alt="End of change" /></p>
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<p>Some factors to consider in determining the journal object limit are: </p>
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<ul><li>Number of objects that would be actively changing at any given time</li>
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<li><img src="./delta.gif" alt="Start of change" />The impact journaling has on the performance of your system<img src="./deltaend.gif" alt="End of change" /></li>
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<li>Importance in being able to get some parallelism at IPL, run-time, hot-site
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apply, and high-availability (HA) replay time</li>
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<li>Complexity of managing your journal environment with multiple journals</li>
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<li>Complexity of your hot-site recovery procedures if you have dependencies
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between objects journaled to different journals </li>
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<li>Number of objects you may need to journal in the future</li>
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<li><img src="./delta.gif" alt="Start of change" />Increasing the quantity of objects associated with a single
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journal may increase your IPL time, independent ASP vary on time, or disaster
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recovery time. As a general rule, if the number of actively changing objects
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is likely to be greater than 5,000, consider journaling some of these objects
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to a separate journal. The larger the number of actively changing objects
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for a given journal at system termination, the longer it will take to recover
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the journal at IPL or vary on of an independent ASP.<img src="./deltaend.gif" alt="End of change" /></li>
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</ul>
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<p><strong>*MAX250K</strong></p>
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<p>The maximum number of objects that can be journaled to one journal is 250,000.
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This is the default value.</p>
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<p><strong>*MAX10M</strong></p>
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<p>The maximum number of objects that can be journaled to a single journal
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is 10,000,000. A journal employing this attribute cannot be saved and restored
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to any releases prior to V5R4 nor can it be replicated to any remote journals
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on any systems prior to V5R4.</p>
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<div class="note"><span class="notetitle">Note:</span> Once you have chosen the *MAX10M option, you cannot switch
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back to the *MAX250K value.</div>
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<p><img src="./delta.gif" alt="Start of change" />If the number of currently journaled objects is greater than
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the maximum number of journaled objects, a start journal request will fail.<img src="./deltaend.gif" alt="End of change" /></p>
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<div class="note"><span class="notetitle">Note:</span> A new receiver must be attached at the same time as this value is changed. </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="rzakiplnjrnsu.htm" title="The following topics provide information to plan configuration for journals. They provide information about each option that you can select for journal.">Plan setup for journals</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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