70 lines
4.6 KiB
HTML
70 lines
4.6 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Effects of the storage pool paging option on database recovery" />
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<meta name="abstract" content="The shared pool paging option controls whether the system dynamically adjusts the paging characteristics of the storage pool for optimum performance." />
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<title>Effects of the storage pool paging option on database recovery</title>
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</head>
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<body id="rbaforzahfprw"><a name="rbaforzahfprw"><!-- --></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">Effects of the storage pool paging option on database recovery</h1>
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<div><p>The shared pool paging option controls whether the system dynamically
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adjusts the paging characteristics of the storage pool for optimum performance.</p>
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<div class="p"> <ul><li>The system does not dynamically adjust paging characteristics for a paging
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option of *FIXED.</li>
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<li>The system dynamically adjusts paging characteristics for a paging option
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of *CALC.</li>
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<li>You can also control the paging characteristics through an application
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programming interface. For more information, see Change Pool Tuning Information
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API (QWCCHGTN) in the Application programming interfaces (APIs) topic.</li>
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</ul>
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</div>
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<p>A shared pool paging option other than *FIXED can have an impact on data
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loss for nonjournaled physical files in a system failure. When you do not
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journal physical files, data loss from a system failure, where memory is not
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saved, can increase for *CALC or USRDFN paging options. You can write file
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changes to auxiliary storage less frequently for these options. There is a
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risk of data loss for nonjournaled files with the *FIXED option, but the risk
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can be higher for *CALC or user-defined (USRDFN) paging options. For more
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information about the paging option, see Automatically tune performance of
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the Performance topic.</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="rbaforzahfprs.htm" title="After an abnormal system end, the system proceeds through several automatic recovery steps. The system rebuilds the directory and synchronizes the journal to the files being journaled. The system performs recovery operations during IPL and after IPL.">The database recovery process after an abnormal system end</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="../rzahx/rzahxtuneautotune.htm">Automatically tune performance</a></div>
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<div><a href="../apiref/api.htm">Application programming interfaces (APIs)</a></div>
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<div><a href="../rzahx/rzahx1.htm">Performance</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/qwcchgtn.htm">Change Pool Tuning Information API (QWCCHGTN) command</a></div>
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</div>
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</div>
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</body>
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</html> |