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<h1 class="topictitle1">Use the relational database directory</h1>
<div><p>The <span class="keyword">i5/OS™</span> licensed
program uses the relational database directory to define the relational database
names that can be accessed by applications running on an <span class="keyword">iSeries™ server</span>,
to specify if the connection uses Systems Network Architecture (SNA) or IP,
and to associate these relational database names with their corresponding
network parameters.</p>
<p>The relational database directory allows an application requester (AR)
to accept a relational database name from the application and translate this
name into the appropriate Internet Protocol (IP) address or host name and
port, or the appropriate Systems Network Architecture network identifier and
logical unit (LU) name values for communications processing. As of V5R2, the
RDB directory is also used to specify the user's preferred outbound connection
security mechanism. The relational database directory also allows associating
an ARD program with a relational database name.</p>
<p>Each iSeries system
in the distributed relational database network must have a relational database
directory configured. There is only one relational database directory on a
system. Each AR in the distributed relational database network must have an
entry in its relational database directory for its local relational database
and one for each remote and local user relational database the AR accesses.
Any system in the distributed relational database network that acts only as
an application server (AS) does not need to include the relational database
names of other remote relational databases in its directory.</p>
<p>The relational database name assigned to the local relational database
must be unique. That is, it should be different from any other relational
database in the network. Names assigned to other relational databases in the
directory identify remote relational databases, or local user databases. The
names of remote RDBs must match the name an AS uses to identify its local
system database or one of its user databases, if configured. If the local
system RDB name entry at an AS does not exist when it is needed, one will
be created automatically in the directory. The name used will be the current
system name displayed by the <span class="cmdname">Display Network Attributes (DSPNETA)</span> command.</p>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="rbal1workwith.htm">Work with the relational database directory</a></strong><br />
Use these instructions to work with the relational database directory.</li>
<li class="ulchildlink"><strong><a href="rbal1rddsetupexample.htm">Example: Set up a relational database directory</a></strong><br />
The Spiffy Corporation network provides an example to illustrate how the relational database directory is used on servers in a distributed relational database network and show how each is set up. The example assumes the use of Advanced Program-to-Program Communication (APPC) for communications, as opposed to TCP/IP, which would be simpler to set up.</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal1setup.htm" title="The runtime support for an iSeries distributed relational database is provided by the operating system. Therefore, when the operating system is installed, distributed relational database support is installed.">Initial setup</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<div><a href="../cl/dspneta.htm">Display Network Attributes (DSPNETA) command</a></div>
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