55 lines
4.4 KiB
HTML
55 lines
4.4 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="Change database file descriptions and attributes" />
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<meta name="abstract" content="These topics discuss how to change the database file descriptions and attributes. Considerations for changing fields in a file description are also included." />
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<meta name="description" content="These topics discuss how to change the database file descriptions and attributes. Considerations for changing fields in a file description are also included." />
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<meta name="DC.subject" content="database file, changing, descriptions, attributes" />
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<meta name="keywords" content="database file, changing, descriptions, attributes" />
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<meta name="DC.Relation" scheme="URI" content="rbafomanage.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafoecffd.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafochgpfda.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafochglfda.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="rbafochgfile" />
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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>Change database file descriptions and attributes</title>
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</head>
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<body id="rbafochgfile"><a name="rbafochgfile"><!-- --></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">Change database file descriptions and attributes</h1>
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<div><p>These topics discuss how to change the database file
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descriptions and attributes. Considerations for changing fields in a file
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description are also included.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafoecffd.htm">Effects of changing fields in a file description</a></strong><br />
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The system uses the information in the record format description to determine the level identifier. Changes to the fields in a file description cause the level identifier to change. Changes in key fields or select/omit fields might cause unexpected results in programs using the new access path.</li>
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<li class="ulchildlink"><strong><a href="rbafochgpfda.htm">Change a physical file description and attributes</a></strong><br />
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Sometimes when you make a change to a physical file description and then re-create the file, the level identifier can change. If the level identifier changes, you can either compile the program again or avoid recompiling using a logical file.</li>
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<li class="ulchildlink"><strong><a href="rbafochglfda.htm">Change a logical file description and attributes</a></strong><br />
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As a general rule, when you make changes to a logical file, which causes a change to the level identifier (for example, adding a new field, deleting a field, or changing the length of a field), it is strongly recommended that you recompile the program that uses the logical file.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafomanage.htm" title="These topics discuss how to maintain control of database files on your system by managing the files, their descriptions and attributes. Information about how to maintain control over your data to protect it from loss, how to ensure data integrity with constraints, and how to set up trigger events when the data changes is included.">Manage database files</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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