103 lines
5.3 KiB
HTML
103 lines
5.3 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="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="Access intent of a committable resource" />
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<meta name="abstract" content="The access intent determines how the resources participate together in a transaction." />
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<meta name="description" content="The access intent determines how the resources participate together in a transaction." />
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<meta name="DC.Relation" scheme="URI" content="rzakjresources.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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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>Access intent of a committable resource</title>
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</head>
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<body id="rzakjintent"><a name="rzakjintent"><!-- --></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">Access intent of a committable resource</h1>
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<div><p>The access intent determines how the resources participate together
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in a transaction.</p>
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<p>When a resource is placed under commitment control, the resource manager
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indicates how the resource will be accessed:</p>
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<ul><li>Update</li>
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<li>Read-only</li>
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<li>Undetermined</li>
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</ul>
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<p> The following table shows what access intents are possible for a particular
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type of resource and how the system determines the access intent for a resource
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when it is registered.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" id="d0e30">Resource type</th>
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<th valign="top" id="d0e32">Possible access intents</th>
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<th valign="top" id="d0e34">How the access intent is determined</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e30 ">FILE</td>
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<td valign="top" headers="d0e32 ">Update, read-only</td>
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<td valign="top" headers="d0e34 ">Based on how the file was opened</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">DDL</td>
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<td valign="top" headers="d0e32 ">Update</td>
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<td valign="top" headers="d0e34 ">Always update</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">API</td>
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<td valign="top" headers="d0e32 ">Update</td>
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<td valign="top" headers="d0e34 ">Always update</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">DDM</td>
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<td valign="top" headers="d0e32 ">Update, read-only</td>
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<td valign="top" headers="d0e34 ">Based on how the file was opened</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">LU62</td>
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<td valign="top" headers="d0e32 ">Undetermined</td>
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<td valign="top" headers="d0e34 ">Always undetermined</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">DRDA<sup>®</sup></td>
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<td valign="top" headers="d0e32 ">Update, read-only, undetermined</td>
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<td valign="top" headers="d0e34 ">For DRDA Level
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1, the access intent is update if no other remote resources are registered.
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Otherwise, the access intent is read-only. For DRDA Level 2, the access intent is always
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undetermined.</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">TCP</td>
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<td valign="top" headers="d0e32 ">Undetermined</td>
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<td valign="top" headers="d0e34 ">Always undetermined</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>The access intent of resources that are already registered determines whether
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a new resource can be registered. The following rules apply:</p>
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<ul><li>A one-phase resource whose access intent is update cannot be registered
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when any of the following conditions is true: <ul><li>Resources whose access intent is update are already registered at other
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locations.</li>
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<li>Resources whose access intent is undetermined are already registered at
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other locations.</li>
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<li>Resources whose access intent is undetermined are already registered at
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the same location and the resources have been changed during the current transaction.</li>
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</ul>
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</li>
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<li>A two-phase resource whose access intent is update cannot be registered
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when a one-phase resource whose access intent is update is already registered.</li>
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</ul>
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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="rzakjresources.htm" title="When you place an object under commitment control, it becomes a committable resource. It is registered with the commitment definition. It participates in each commit operation and rollback operation that occurs for that commitment definition.">How commitment control works with objects</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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