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133 lines
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<title>Distributed relational database function and SQL</title>
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<body id="rbafydrda"><a name="rbafydrda"><!-- --></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">Distributed relational database function and SQL</h1>
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<div><p>A <dfn class="term">distributed relational database</dfn> consists of a set
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of SQL objects that are spread across interconnected computer systems.</p>
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<div class="section"><p>These relational databases can be of the same type (for example, <span class="keyword">DB2<sup>®</sup> UDB for iSeries™</span>) or of different types (DB2
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Universal Database™ for z/OS<sup>®</sup>, DB2 for VSE and VM, DB2 Universal Database™ (UDB),
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or non-IBM database management systems which support DRDA<sup>®</sup>). Each relational database has a relational
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database manager to manage the tables in its environment. The database managers
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communicate and cooperate with each other in a way that allows a given database
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manager access to run SQL statements on a relational database on another system.</p>
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</div>
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<div class="section"><p>The application requester supports the application side of a connection.
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The application server is the local or remote database to which an application
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requester is connected. <span class="keyword">DB2 UDB for iSeries</span> provides
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support for Distributed
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Relational Database Architecture™ (DRDA) to allow an application requester
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to communicate with application servers. In addition, <span class="keyword">DB2 UDB for iSeries</span> can
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call exit programs to allow access to data on other database management systems
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which do not support DRDA. These exit programs are called application requester
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driver (ARD) programs.</p>
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</div>
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<div class="section"><p><span class="keyword">DB2 UDB for iSeries</span> supports
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two levels of distributed relational database: </p>
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<ul><li>Remote unit of work (RUW) <p>Remote unit of work is where the preparation
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and running of SQL statements occurs at only one application server during
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a unit of work. <span class="keyword">DB2 UDB for iSeries</span> supports
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RUW over either APPC or TCP/IP.</p>
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</li>
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<li>Distributed unit of work (DUW) <p>Distributed unit of work is where the
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preparation and running of SQL statements can occur at multiple applications
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servers during a unit of work. However, a single SQL statement can only refer
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to objects located at a single application server. <span class="keyword">DB2 UDB for iSeries</span> supports
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DUW over APPC and, beginning in V5R1, introduced support for DUW over TCP/IP.</p>
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</li>
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</ul>
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</div>
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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="rbafydrdbsupport.htm">DB2 UDB for iSeries distributed relational database support</a></strong><br />
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The <span class="keyword">DB2 UDB Query Manager and SQL Development Kit</span> licensed
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program supports interactive access to distributed databases with the following
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SQL statements.</li>
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<li class="ulchildlink"><strong><a href="rbafydrdbexample.htm">DB2 UDB for iSeries distributed relational database example program</a></strong><br />
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A remote unit of work relational database sample program is
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shipped with the SQL product. There are several files and members within the
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QSQL library to help you set up an environment that will run a distributed <span class="keyword">DB2 UDB for iSeries</span> sample program.</li>
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<li class="ulchildlink"><strong><a href="rbafypacksupport.htm">SQL package support</a></strong><br />
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The operating system supports an object called an SQL package. The object type is *SQLPKG.</li>
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<li class="ulchildlink"><strong><a href="rbafyccsidpackage.htm">CCSID considerations for SQL</a></strong><br />
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If you are running a distributed application and one of your systems
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is not an <span class="keyword">iSeries</span> system, the
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job CCSID value on the <span class="keyword">iSeries</span> server
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cannot be set to 65535.</li>
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<li class="ulchildlink"><strong><a href="rbafyconnectmgmt.htm">Connection management and activation groups</a></strong><br />
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SQL connections are managed at the activation group level. Each activation group within a job manages its own connections and these connections are not shared across activation groups.</li>
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<li class="ulchildlink"><strong><a href="rbafydistribsupport.htm">Distributed support</a></strong><br />
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<span class="keyword">DB2 UDB for iSeries</span> supports
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two levels of distributed relational database.</li>
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<li class="ulchildlink"><strong><a href="rbafyduwex.htm">Distributed unit of work</a></strong><br />
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Distributed unit of work (DUW) allows access to multiple application servers within the same unit of work. Each SQL statement can access only one application server. Using distributed unit of work allows changes at multiple applications servers to be committed or rolled back within a single unit of work.</li>
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<li class="ulchildlink"><strong><a href="rbafyardpgmex.htm">Application requester driver programs</a></strong><br />
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To complement database access provided by products that implement DRDA, <span class="keyword">DB2 UDB for iSeries</span> provides an interface for writing
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exit programs on a <span class="keyword">DB2 UDB for iSeries</span> application
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requester to process SQL requests. Such an exit program is called an <dfn class="term">application
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requester driver</dfn>.</li>
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<li class="ulchildlink"><strong><a href="rbafyprobhandle.htm">Problem handling</a></strong><br />
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The primary strategy for capturing and reporting error information
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for the distributed database function is called <dfn class="term">first failure
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data capture (FFDC)</dfn>.</li>
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<li class="ulchildlink"><strong><a href="rbafydrdastoredproc.htm">DRDA stored procedure considerations</a></strong><br />
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The iSeries DRDA server
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supports the return of one or more result sets from a stored procedure.</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="rbafykickoff.htm" title="These topics describe the iSeries server implementation of the Structured Query Language (SQL) using DB2 UDB for iSeries and the DB2 UDB Query Manager and SQL Development Kit Version 5 licensed program.">SQL programming</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rbafyintro.htm" title="These topics describe the iSeries server implementation of the Structured Query Language (SQL) using DB2 UDB for iSeries and the DB2 UDB Query Manager and SQL Development Kit licensed program.">Introduction to DB2 UDB for iSeries Structured Query Language</a></div>
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<div><a href="rbafypack1.htm" title="An SQL package is an object that contains the control structure produced when the SQL statements in an application program are bound to a remote relational database management system (DBMS).">SQL packages</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="rbafydatadrda.htm" title="A distributed relational database consists of a set of SQL objects that are spread across interconnected computer systems. Each relational database has a relational database manager to manage the tables in its environment.">Access data using Distributed Relational Database (DRDA)</a></div>
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<div><a href="../ddp/rbal1kickoff.htm">Distributed database programming</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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