86 lines
5.5 KiB
HTML
86 lines
5.5 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
||
<!DOCTYPE html
|
||
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
<html lang="en-us" xml:lang="en-us">
|
||
<head>
|
||
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||
<meta name="security" content="public" />
|
||
<meta name="Robots" content="index,follow" />
|
||
<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))' />
|
||
<meta name="DC.Type" content="concept" />
|
||
<meta name="DC.Title" content="Control when access paths are rebuilt" />
|
||
<meta name="abstract" content="If the system ends abnormally, during the next initial program load (IPL), the system automatically lists those files that require access path recovery. You can control when access paths are rebuilt." />
|
||
<meta name="description" content="If the system ends abnormally, during the next initial program load (IPL), the system automatically lists those files that require access path recovery. You can control when access paths are rebuilt." />
|
||
<meta name="DC.Relation" scheme="URI" content="rbaforzahfpro.htm" />
|
||
<meta name="DC.Relation" scheme="URI" content="../cl/edtrbdap.htm" />
|
||
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
||
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
||
<meta name="DC.Format" content="XHTML" />
|
||
<meta name="DC.Identifier" content="rbaforzahfprp" />
|
||
<meta name="DC.Language" content="en-us" />
|
||
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
||
<!-- US Government Users Restricted Rights -->
|
||
<!-- Use, duplication or disclosure restricted by -->
|
||
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
||
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
||
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
||
<title>Control when access paths are rebuilt</title>
|
||
</head>
|
||
<body id="rbaforzahfprp"><a name="rbaforzahfprp"><!-- --></a>
|
||
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
||
<h1 class="topictitle1">Control when access paths are rebuilt</h1>
|
||
<div><p>If the system ends abnormally, during the next initial program
|
||
load (IPL), the system automatically lists those files that require
|
||
access path recovery. You can control when access paths are rebuilt.</p>
|
||
<p>You can decide whether to rebuild the access path:</p>
|
||
<div class="p"> <ul><li>During the IPL</li>
|
||
<li>After the IPL</li>
|
||
<li>When you first use the file. </li>
|
||
</ul>
|
||
</div>
|
||
<div class="p">You can also: <ul><li>Change the scheduling order in which the access paths are rebuilt</li>
|
||
<li>Hold rebuilding of an access path indefinitely</li>
|
||
<li>Continue the IPL process while access paths with a sequence value that
|
||
is less than or equal to the <em>*IPL threshold</em> value are rebuilding.</li>
|
||
<li>Control the rebuilding of access paths after the system has completed
|
||
the IPL process by using the Edit Rebuild of Access Paths (EDTRBDAP) command.</li>
|
||
</ul>
|
||
</div>
|
||
<p>The IPL threshold value determines which access paths to rebuild during
|
||
the IPL. All access paths with a sequence value that is less than or equal
|
||
to the IPL threshold value rebuild during the IPL. Changing the IPL threshold
|
||
value to 99 means that all access paths with a sequence value of 1 through
|
||
99 rebuild during the IPL. Changing the IPL threshold value to 0 means that
|
||
no access paths rebuild until after the system completes its IPL, except those
|
||
access paths that were being journaled and those access paths for system files.</p>
|
||
<p>The access path recovery value for a file is determined by the value you
|
||
specified for the RECOVER parameter on the create and change file commands.
|
||
The default recovery value for *IPL (rebuild during IPL) is 25 and the default
|
||
value for AFTIPL (rebuild after IPL) is 75; therefore, RECOVER(*IPL) will
|
||
show as 25. The initial IPL threshold value is 50; this allows the parameters
|
||
to affect when the access path is rebuilt. You can override this value on
|
||
the Edit Rebuild of Access Paths display.</p>
|
||
<p>If a file is not needed immediately after IPL time, specify that the file
|
||
can be rebuilt at a later time. This should reduce the number of access paths
|
||
that need to be rebuilt at IPL, allowing the system to complete its IPL much
|
||
faster.</p>
|
||
<p>For example, you can specify that all files that must have their access
|
||
paths rebuilt should rebuild the access paths when the file is first used.
|
||
In this case, no access paths are rebuilt at IPL. You can control the order
|
||
in which the access paths are rebuilt by running only those programs that
|
||
use the files you want to rebuild first. This method shortens the IPL time
|
||
and can make the first of several applications available faster. However,
|
||
the overall time to rebuild access paths probably is longer. (Other work might
|
||
be running when the access paths are being rebuilt, and there might be less
|
||
main storage available to rebuild the access paths).</p>
|
||
</div>
|
||
<div>
|
||
<div class="familylinks">
|
||
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbaforzahfpro.htm" title="Rebuilding a database access path might take as much as one minute for every 10 000 records. But some factors might affect the time estimate for rebuilding access paths.">Rebuild access paths</a></div>
|
||
</div>
|
||
<div class="relref"><strong>Related reference</strong><br />
|
||
<div><a href="../cl/edtrbdap.htm">Edit Rebuild of Access Paths (EDTRBDAP) command</a></div>
|
||
</div>
|
||
</div>
|
||
</body>
|
||
</html> |