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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/mnesia-4.7.1.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Mnesia</strong><br><strong>Reference Manual</strong><br><small>Version 4.7.1</small></p>
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<li title="snmp_close_table-1"><a href="mnesia.html#snmp_close_table-1">snmp_close_table/1</a></li>
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<!-- refpage --><center><h1>mnesia_registry</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">mnesia_registry</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Dump support for registries in erl_interface. </div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>The module <span class="code">mnesia_registry</span> is usually part of
<span class="code">erl_interface</span>, but for the time being, it is a part of the
Mnesia application.
</p>
<p><span class="code">mnesia_registry</span> is mainly an module intended for
internal usage within OTP, but it has two functions that
are exported for public use.
</p>
<p>On C-nodes <span class="code">erl_interface</span> has support for registry
tables. These reside in RAM on the C-node but they may also be
dumped into Mnesia tables. By default, the dumping of registry
tables via <span class="code">erl_interface</span> causes a corresponding Mnesia
table to be created with <span class="code">mnesia_registry:create_table/1</span>
if necessary.
</p>
<p>The tables that are created with these functions can be
administered as all other Mnesia tables. They may be included in
backups or replicas may be added etc. The tables are in fact
normal Mnesia tables owned by the user of the corresponding
<span class="code">erl_interface</span> registries.
</p>
</p></div>
<h3>EXPORTS</h3>
<p><a name="create_table-1"><span class="bold_code">create_table(Tab) -> ok | exit(Reason)</span></a><br></p>
<div class="REFBODY"><p>
<p>This is a wrapper function for
<span class="code">mnesia:create_table/2</span> which creates a table (if there is no existing table)
with an appropriate set of <span class="code">attributes</span>. The table will
only reside on the local node and its storage type will be
the same as the <span class="code">schema</span> table on the local
node, ie. <span class="code">{ram_copies,[node()]}</span> or
<span class="code">{disc_copies,[node()]}</span>.
</p>
<p>It is this function that is used by <span class="code">erl_interface</span> to
create the Mnesia table if it did not already exist.</p>
</p></div>
<p><a name="create_table-2"><span class="bold_code">create_table(Tab, TabDef) -> ok | exit(Reason)</span></a><br></p>
<div class="REFBODY"><p>
<p>This is a wrapper function for
<span class="code">mnesia:create_table/2</span> which creates a table (if there is no existing table)
with an appropriate set of <span class="code">attributes</span>. The attributes
and <span class="code">TabDef</span> are forwarded to
<span class="code">mnesia:create_table/2</span>. For example, if the table should
reside as <span class="code">disc_only_copies</span> on all nodes a call would
look like:</p>
<div class="example"><pre>
TabDef = [{{disc_only_copies, node()|nodes()]}],
mnesia_registry:create_table(my_reg, TabDef)
</pre></div>
</p></div>
<h3><a name="id87080">See Also</a></h3>
<div class="REFBODY">
<p>mnesia(3), erl_interface(3)
</p>
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