.TH mnesia_registry 3erl "mnesia 4.14.2" "Ericsson AB" "Erlang Module Definition"
.SH NAME
mnesia_registry \- Dump support for registries in erl_interface.
.SH DESCRIPTION
.LP
This module is usually part of the \fIerl_interface\fR\& application, but is currently part of the Mnesia application\&.
.LP
This module is mainly intended for internal use within OTP, but it has two functions that are exported for public use\&.
.LP
On C-nodes, \fIerl_interface\fR\& 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 \fIerl_interface\fR\& causes a corresponding Mnesia table to be created with \fImnesia_registry:create_table/1\fR\&, if necessary\&.
.LP
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 \fIerl_interface\fR\& registries\&.
.SH EXPORTS
.LP
.B
create_table(Tab) -> ok | exit(Reason)
.br
.RS
.LP
A wrapper function for \fImnesia:create_table/2\fR\&, which creates a table (if there is no existing table) with an appropriate set of \fIattributes\fR\&\&. The table only resides on the local node and its storage type is the same as the \fIschema\fR\& table on the local node, that is, \fI{ram_copies,[node()]}\fR\& or \fI{disc_copies,[node()]}\fR\&\&.
.LP
This function is used by \fIerl_interface\fR\& to create the Mnesia table if it does not already exist\&.
.RE

.LP
.B
create_table(Tab, TabDef) -> ok | exit(Reason)
.br
.RS
.LP
A wrapper function for \fImnesia:create_table/2\fR\&, which creates a table (if there is no existing table) with an appropriate set of \fIattributes\fR\&\&. The attributes and \fITabDef\fR\& are forwarded to \fImnesia:create_table/2\fR\&\&. For example, if the table is to reside as \fIdisc_only_copies\fR\& on all nodes, a call looks as follows:
.LP
.nf

          TabDef = [{{disc_only_copies, node()|nodes()]}],
          mnesia_registry:create_table(my_reg, TabDef)
.fi
.RE

.SH "SEE ALSO"

.LP
\fBerl_interface(3erl)\fR\&, \fBmnesia(3erl)\fR\&