64 lines
4.5 KiB
HTML
64 lines
4.5 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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<head>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="How the system chooses access paths to protect" />
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<meta name="abstract" content="The system periodically examines access path exposure and estimates how long it would take to rebuild all the exposed access paths. If the rebuild time exceeds your target recovery times for access paths, the system selects additional access paths for protection." />
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<meta name="description" content="The system periodically examines access path exposure and estimates how long it would take to rebuild all the exposed access paths. If the rebuild time exceeds your target recovery times for access paths, the system selects additional access paths for protection." />
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<meta name="DC.Relation" scheme="URI" content="rzakismappintro.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="rzakichoosesap" />
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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>How the system chooses access paths to protect</title>
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</head>
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<body id="rzakichoosesap"><a name="rzakichoosesap"><!-- --></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">How the system chooses access paths to protect</h1>
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<div><p>The system periodically examines access path exposure and estimates
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how long it would take to rebuild all the exposed access paths. If the rebuild
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time exceeds your target recovery times for access paths, the system selects
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additional access paths for protection.</p>
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<p>An access path is <strong>exposed</strong> when the access path has
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changed because records have been added or deleted or because a key field
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has changed, and those changes have not yet been written to the disk. The
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system periodically examines access path exposure and estimates the time required
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to rebuild all the exposed access paths. If the rebuild time exceeds your
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target recovery times for access paths, the system selects additional access
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paths for protection. The system can also remove access paths from protection
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if the estimated time for rebuilding access paths consistently falls below
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your target recovery times for access paths. The recover attribute of a file
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is not used in determining whether to protect access paths.</p>
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<p>Some access paths are not eligible for protection by SMAPP:</p>
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<ul><li>A file that specifies MAINT(*REBLD).</li>
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<li>An access path that is already explicitly journaled.</li>
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<li>An access path in the QTEMP library.</li>
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<li>An access path whose underlying physical files are journaled to different
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journals.</li>
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<li>A file journaled to a journal in standby state.</li>
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<li><img src="./delta.gif" alt="Start of change" />Some access paths that use an international component for unicode
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(ICU) sort sequence table.<img src="./deltaend.gif" alt="End of change" /></li>
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</ul>
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<p>You can use the <span class="cmdname">Display Recovery for Access Paths (DSPRCYAP)</span> command
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to see a list of access paths that are not eligible for SMAPP.</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="rzakismappintro.htm" title="System-managed access-path protection (SMAPP) allows you to use some of the advantages of journaling without explicitly setting up journaling. Use SMAPP to decrease the time it takes to restart your system after an abnormal end.">System-managed access-path protection</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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