80 lines
5.1 KiB
HTML
80 lines
5.1 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="Domain concepts" />
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<meta name="abstract" content="All objects are assigned a domain attribute when they are created." />
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<meta name="description" content="All objects are assigned a domain attribute when they are created." />
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<meta name="DC.Relation" scheme="URI" content="concept.htm" />
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<meta name="DC.Relation" scheme="URI" content="../apis/quscrtuq.htm#uq_domain" />
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<meta name="DC.Relation" scheme="URI" content="ExTaskDataque.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="conDomain" />
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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>Domain concepts</title>
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</head>
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<body id="conDomain"><a name="conDomain"><!-- --></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">Domain concepts</h1>
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<div><p>All objects are assigned a domain attribute when they are created.</p>
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<p>A <em>domain</em> is a characteristic of an object that controls how programs
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can access the object. Once set, the domain remains in effect for the life
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of the object. The two possible attributes are <em>system</em> and <em>user</em>.</p>
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<p>Most object types on the system are created in system domain. When you
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run your system at security level 40 or 50, system domain objects can be accessed
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only by using the commands and callable APIs provided.</p>
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<p>These object types can be either system or user domain. The list includes
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the symbolic object type.</p>
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<ul><li>User space (*USRSPC)</li>
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<li>User index (*USRIDX)</li>
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<li>User queue (*USRQ)</li>
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</ul>
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<p>Objects of the type *USRSPC, *USRIDX, and *USRQ in the user domain can
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be manipulated directly by MI instructions without using the system-provided
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APIs and commands.</p>
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<div class="note"><span class="notetitle">Note:</span> Objects of the type *PGM, *SRVPGM, and *SQLPKG also can be in the user
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domain. Their contents cannot be manipulated directly by MI instructions.</div>
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<p>Prior to Version 2 Release 3 Modification 0, all user objects were created
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into the user domain. Starting in Version 2 Release 3 Modification 0, user
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objects can exist in either the user domain or the system domain. The allow
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user domain (QALWUSRDMN) system value determines which libraries can contain
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user-domain user objects. The default QALWUSRDMN system value is set to *ALL,
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but can be changed by system administrators on individual machines to be one
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library or a list of libraries. If your application requires direct pointer
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access to user-domain user objects in a library that is not specified in the
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QALWUSRDMN value, your system administrator can add the library to the system
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value.</p>
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<p>The ability to create user domain objects on a system with a security level
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40 or 50 is controlled by the allow user domain (QALWUSRDMN) system value.
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See the User queue domain table in the description of the Create
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User Queue (QUSCRTUQ) API for more information.</p>
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<div class="note"><span class="notetitle">Note:</span> On a system configured for C2 system security, QALWUSRDMN is set to
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QTEMP (only the QTEMP library can contain user-domain user objects).</div>
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<p>For more information about C2 security, refer to the <cite>Guide to Enabling
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C2 Security</cite> book, SC41-0103.</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="concept.htm" title="Describes the underlying concepts that you need to understand to work effectively with APIs. Among the concepts covered are basic concepts, programming considerations, and terminology.">API concepts</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../apis/quscrtuq.htm#uq_domain">User queue domain</a></div>
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<div><a href="ExTaskDataque.htm" title="Data queues and user queues both provide a means for one or more processes to communicate asynchronously. The queues can be processed FIFO (first-in first-out), LIFO (last-in first-out), or by key.">Examples: Using data queues or user queues</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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