59 lines
4.3 KiB
HTML
59 lines
4.3 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="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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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="Database file conversions" />
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<meta name="abstract" content="In V5R4, database files that were created on a release earlier than V5R4 are converted to eliminate a performance degradation that might occur due to Enhanced Hardware Storage Protection support." />
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<meta name="description" content="In V5R4, database files that were created on a release earlier than V5R4 are converted to eliminate a performance degradation that might occur due to Enhanced Hardware Storage Protection support." />
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<meta name="DC.Relation" scheme="URI" content="convert.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="dbconv" />
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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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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Database file conversions</title>
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</head>
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<body id="dbconv"><a name="dbconv"><!-- --></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">Database file conversions</h1>
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<div><p>In V5R4, database files that were created on a release earlier
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than V5R4 are converted to eliminate a performance degradation that might
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occur due to Enhanced Hardware Storage Protection support.</p>
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<p>Because database files (*FILE objects) consist of many machine interface
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(MI) objects, the time to convert them could
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be significant when an application is started the first time after V5R4 is
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installed. Also, because the MI objects will have their header size increased
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to 4K during the conversion, each MI object associated with a database file
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will grow in size by 4K (4096 bytes). </p>
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<p>To spread the MI object conversions out over a period of time, the database
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file conversion support is designed to be done when the database MI objects
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are first accessed or used after V5R4 is installed. If you would like to evaluate
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the impact that the database file conversions might have on one or more of
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your applications and determine if you have enough time during your upgrade
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window to take the necessary steps to eliminate the startup performance degradation
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for your more critical applications, run the QDBFIMIC program that is included
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in PTF SI18716 (if you are upgrading from V5R2) or PTF SI18615 (if you are
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upgrading from V5R3). <span>The cover letter for these PTFs (and
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all other PTFs) is on the <a href="http://www.ibm.com/servers/eserver/support/iseries/" target="_blank">Support for iSeries Family</a> <img src="www.gif" alt="Link outside information center" /> Web site (www.ibm.com/servers/eserver/support/iseries/).
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In the navigation bar, click <span class="uicontrol">Technical databases</span>; then
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click <span class="uicontrol">PTF Cover Letters</span>.</span></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="convert.htm" title="The number and type of conversions that occur when you upgrade to a new release can have a significant effect either during the upgrade or during normal operations after you upgrade. More conversions occur if you are skipping a release level. You need to consider the time for conversions in both the release you are skipping and in the new release.">Times for conversions</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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