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<h1 class="topictitle1">Distributed relational database architecture support</h1>
<div><p>DRDA<sup>®</sup> support
for distributed relational database processing is used by IBM<sup>®</sup> relational
database products. DRDA support defines protocols for communication between
an application program and a remote relational database.</p>
<div class="section"><div class="p">Distributed
Relational Database Architecture™ (DRDA) support provides distributed relational
database management in both IBM and non-IBM environments. In IBM environments, relational data is managed
with the following programs: <ul><li>DB2
Universal Database™ for <span class="keyword">iSeries™</span></li>
<li>DB2
Universal Database for z/OS<sup>®</sup></li>
<li>DB2
Universal Database for VSE/VM</li>
<li>DB2
Universal Database for AIX<sup>®</sup></li>
<li>DB2
Universal Database for Linux<sup>®</sup></li>
<li>DB2
Universal Database for HP-UX</li>
<li>DB2
Universal Database for Sun Solaris</li>
<li>DB2
Universal Database for Windows<sup>®</sup></li>
</ul>
</div>
</div>
<div class="section"><p>DRDA support
provides the structure for access to database information for relational database
managers operating in <strong>like</strong> and <strong>unlike</strong> environments. For example,
access to relational data between two or more DB2<sup>®</sup> UDB for <span class="keyword">iSeries</span> is
distribution in a like environment. Access to relational data between DB2 UDB
for <span class="keyword">iSeries</span> and another type
of system or a client different from the one embedded in <span class="keyword">i5/OS™</span> is
distribution in an unlike environment. One specific example of this is access
to relational data between DB2 UDB for <span class="keyword">iSeries</span> and IBM DB2 Universal
Driver for SQLJ and JDBC.</p>
</div>
<div class="section"><p>SQL is the standard IBM database language. It provides the
necessary consistency to enable distributed data processing across like and
unlike operating environments. Within DRDA support, SQL allows users to define,
retrieve, and manipulate data across environments that support a DRDA implementation.</p>
<p><img src="./delta.gif" alt="Start of change" />The Distributed Relational
Database Architecture™ is an extension of the distributed data management
(DDM) architecture. However, DRDA and DDM methods for accessing data are different. DRDA is
an extension of SQL whereas DDM is an extension of native I/O. <img src="./deltaend.gif" alt="End of change" /></p>
<p><img src="./delta.gif" alt="Start of change" />Using
distributed relational database processing, an application can connect to
a remote server using the relational database directory on the local system.
The relational database directory provides the necessary links between a relational
database name and the communications path to that database. An application
running under the distributed relational database only has to identify the
database name and run the SQL statements needed for processing.<img src="./deltaend.gif" alt="End of change" /></p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal1intro.htm" title="Distributed relational database support on the iSeries server consists of an implementation of IBM Distributed Relational Database Architecture (DRDA) and integration of other SQL clients by use of Application Requester Driver (ARD) programs.">Introduction to distributed database programming</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="http://www.ibm.com/software/data/pubs/papers/sqlj/">IBM DB2 Universal Driver for SQLJ and JDBC 1.0</a></div>
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