63 lines
4.3 KiB
HTML
63 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="reference" />
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<meta name="DC.Title" content="Save and restore indexes in the distributed relational database environment" />
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<meta name="abstract" content="Restoring an SQL index can be faster than rebuilding it. Although times vary depending on a number of factors, rebuilding a database index takes approximately one minute for every 10 000 rows." />
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<meta name="description" content="Restoring an SQL index can be faster than rebuilding it. Although times vary depending on a number of factors, rebuilding a database index takes approximately one minute for every 10 000 rows." />
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<meta name="DC.subject" content="saving, indexes, restoring, index, saving and restoring" />
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<meta name="keywords" content="saving, indexes, restoring, index, saving and restoring" />
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<meta name="DC.Relation" scheme="URI" content="rbal1saverestore.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rzahg/rzahgbackup.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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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbal1saveindex" />
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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>Save and restore indexes in the distributed relational database environment</title>
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</head>
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<body id="rbal1saveindex"><a name="rbal1saveindex"><!-- --></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">Save and restore indexes in the distributed relational database environment</h1>
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<div><p>Restoring an SQL index can be faster than rebuilding it. Although
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times vary depending on a number of factors, rebuilding a database index takes
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approximately one minute for every 10 000 rows.</p>
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<div class="section"><p>After restoring the index, the table might need to be brought
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up to date by applying the latest journal changes (depending on whether journaling
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is active). Even with this additional recovery time, you might find it faster
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to restore indexes rather than to rebuild them.</p>
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</div>
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<div class="section"><p>The server ensures the integrity of an index before you can use
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it. If the server determines that the index is unusable, the server attempts
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to recover it. You can control when an index will be recovered. If the server
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ends abnormally, during the next IPL the server automatically lists those
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tables requiring index or view recovery. You can decide whether to rebuild
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the index or to attempt to recover it at one of the following times: </p>
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<ul><li>During the IPL</li>
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<li>After the IPL</li>
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<li>When the table is first used</li>
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</ul>
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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="rbal1saverestore.htm" title="Saving and restoring data and programs allows recovery from a program or server failure, exchange of information between servers, or storage of objects or data offline. A sound backup policy at each server in the distributed relational database network ensures that a server can be restored and made available to network users quickly in the event of a problem.">Save and restore processing for a distributed relational database</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="../rzahg/rzahgbackup.htm">Backup and recovery</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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