106 lines
6.7 KiB
HTML
106 lines
6.7 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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="dc.language" scheme="rfc1766" 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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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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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="keywords" content="relational database" />
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<title>Relational database</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="relationaldb"></a>
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<h2 id="relationaldb"><a href="rbafzmst02.htm#ToC_16">Relational database</a></h2><a id="idx1" name="idx1"></a>
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<p>A <span class="italic">relational database</span> is a database that can be
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perceived as a set of tables and can be manipulated in accordance with the
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relational model of data. The relational database contains a set of objects
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used to store, access, and manage data. The set of objects includes tables,
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views, indexes, aliases, distinct types, functions, procedures, sequences, and packages.</p>
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<p>There are three types of relational databases a user can access from an iSeries system. </p>
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<dl>
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<dt class="bold">system relational database</dt>
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<dd>There is one default relational database on any iSeries system. The system
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relational database is always local to that iSeries system. It consists of all
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the database objects that exist on disk attached to the iSeries system that are
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not stored on independent auxiliary storage pools. For more information on
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independent auxiliary storage pools, see the <a href="../rzahg/rzahgicbasic2.htm">System
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Management </a>category of the iSeries™ Information Center.
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<p>The name of the
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system relational database is, by default, the same as the iSeries system name.
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However, a different name can be assigned through the use of the ADDRDBDIRE
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(Add RDB Directory Entry) command or iSeries Navigator.</p>
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</dd>
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<dt class="bold">user relational database</dt>
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<dd>The user may create additional relational databases on an iSeries system
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by configuring independent auxiliary storage pools on the system. Each primary
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independent auxiliary storage pool is a relational database. It consists of
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all the database objects that exist on the independent auxiliary storage pool
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disks. Additionally, all database objects in the system relational database
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of the iSeries system to which the independent auxiliary storage pool is connected
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are logically included in a user relational database. Thus, the name of any
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schema created in a user relational database must not already exist in that
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user relational database or in the associated system relational database.
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<p>Although the objects in the system relational database are logically included
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in a user relational database, certain dependencies between the objects in
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the system relational database and the user relational database are not allowed:</p>
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<ul>
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<li>A view must be created into a schema that exists in the same relational
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database as its referenced tables, views, or functions.</li>
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<li>An index must be created into a schema that exists in the same relational
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database as its referenced table.</li>
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<li>A trigger or constraint must be created into a schema that exists in the
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same relational database as its base table.</li>
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<li>The parent table and dependent table in a referential constraint must
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both exist in the same relational database.</li>
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<li>A table must be created into a schema that exists in the same relational
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database as any referenced distinct types.</li>
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<li>The parent table and dependent table in a referential constraint must
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both exist in the same relational database.</li></ul><p class="indatacontent">Other dependencies between the objects in the system relational database
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and the user relational database are allowed. For example, a procedure in
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a schema in a user relational database may reference objects in the system
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relational database. However, operations on such an object may fail if the
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other relational database is not available. For example, if a user relational
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database is varied off and then varied on to another system.</p>
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<p>A user
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relational database is local to an iSeries system while the independent auxiliary
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storage pool is varied on. Independent auxiliary storage pools can be varied
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off on one iSeries system and then varied on to another iSeries system. Hence, a
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user relational databases may be local to a given iSeries system at one point
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in time and remote at a different point in time. For more information on independent
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auxiliary storage pools, see the <a href="../rzahg/rzahgicbasic2.htm">System Management </a> category of the iSeries Information Center.</p>
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<p>The name of the user
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relational database is, by default, the same as the independent auxiliary
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storage pool name. However, a different name can be assigned through the use
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of the ADDRDBDIRE (Add RDB Directory Entry) command or iSeries Navigator.</p>
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</dd>
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<dt class="bold">remote relational database</dt>
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<dd>Relational databases on other iSeries and non-iSeries systems can be accessed
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remotely. These relational databases must be registered through the use of
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the ADDRDBDIRE (Add RDB Directory Entry) command or iSeries Navigator.
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</dd>
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</dl>
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<p>The database manager is the name used generically to identify the iSeries Licensed Internal
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Code and the DB2 UDB for iSeries portion of the code that manages the relational database.</p>
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<hr /><br />
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[ <a href="#Top_Of_Page">Top of Page</a> | <a href="rbafzmstconcept.htm">Previous Page</a> | <a href="rbafzmstsqlcon.htm">Next Page</a> | <a href="rbafzmst02.htm#wq1">Contents</a> |
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<a href="rbafzmstindex.htm#index">Index</a> ]
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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