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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>1998</year>
<year>2016</year>
<holder>Ericsson AB, All Rights Reserved</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
The Initial Developer of the Original Code is Ericsson AB.
</legalnotice>
<title>mnesia_registry</title>
<prepared>Dan Gudmundsson and Håkan Mattsson</prepared>
<responsible></responsible>
<docno></docno>
<approved></approved>
<checked></checked>
<date>98-04-24</date>
<rev>A</rev>
<file>mnesia_registry.sgml</file>
</header>
<module>mnesia_registry</module>
<modulesummary>Dump support for registries in erl_interface.</modulesummary>
<description>
<p>This module is usually part of the <c>erl_interface</c>
application, but is currently part of the Mnesia
application.</p>
<p>This module is mainly intended for internal use within OTP,
but it has two functions that are exported for public use.</p>
<p>On C-nodes, <c>erl_interface</c> has support for registry
tables. These tables reside in RAM on the C-node, but can also
be dumped into Mnesia tables. By default, the dumping
of registry tables through <c>erl_interface</c> causes a
corresponding Mnesia table to be created with
<c>mnesia_registry:create_table/1</c>, if necessary.</p>
<p>Tables that are created with these functions can be
administered as all other Mnesia tables. They can be
included in backups, replicas can be added, and so on.
The tables are normal Mnesia tables owned by the user
of the corresponding <c>erl_interface</c> registries.</p>
</description>
<funcs>
<func>
<name>create_table(Tab) -> ok | exit(Reason)</name>
<fsummary>Creates a registry table in Mnesia.</fsummary>
<desc>
<p>A wrapper function for <c>mnesia:create_table/2</c>,
which creates a table (if there is no existing table)
with an appropriate set of <c>attributes</c>. The table
only resides on the local node and its storage type is
the same as the <c>schema</c> table on the local node,
that is, <c>{ram_copies,[node()]}</c> or
<c>{disc_copies,[node()]}</c>.</p>
<p>This function is used by <c>erl_interface</c> to
create the Mnesia table if it does not already
exist.</p>
</desc>
</func>
<func>
<name>create_table(Tab, TabDef) -> ok | exit(Reason)</name>
<fsummary>Creates a customized registry table in Mnesia.</fsummary>
<desc>
<p>A wrapper function for <c>mnesia:create_table/2</c>,
which creates a table (if there is no existing table)
with an appropriate set of <c>attributes</c>. The
attributes and <c>TabDef</c> are forwarded to
<c>mnesia:create_table/2</c>. For example, if the table
is to reside as <c>disc_only_copies</c> on all nodes,
a call looks as follows:</p>
<code type="none">
TabDef = [{{disc_only_copies, node()|nodes()]}],
mnesia_registry:create_table(my_reg, TabDef)</code>
</desc>
</func>
</funcs>
<section>
<title>See Also</title>
<p><seealso marker="erl_interface:index">erl_interface(3)</seealso>,
<seealso marker="mnesia:mnesia">mnesia(3)</seealso></p>
</section>
</erlref>
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