mnesia developments

[Vance Shipley]

Perhaps an example:

-module(install).
-export([start/0]).
 
start() ->
        mnesia:create_schema([node()]),
        application:start(mnesia),
        mnesia:wait_for_tables([schema], 10000),
        mnesia:create_table(ds1Table, [{snmp, [{key, integer}]},
                        {attributes, [index, name, type]}]),
        mnesia:wait_for_tables([ds1Table], 10000),
        eva_sup:create_tables_log_snmp([node()]),
        mnesia:wait_for_tables([eventTable, alarmTable, alarm,
                        eva_snmp_map, evaLogDiscriminatorTable,
                        logTable, logTransferTable], 10000).


Note the wait_for_tables/2 calls.  This non-obvious step is important.
In this example we're creating tables for snmp.


(foo@REDACTED)1> c(install).
{ok,install}
(foo@REDACTED)2> install:start().
ok


This creates a directory named Mnesia.foo@REDACTED which now 
contains:

LATEST.LOG                      logTable.DCD
alarmTable.DCD                  logTransferTable.DCD
evaLogDiscriminatorTable.DCD    schema.DAT
eventTable.DCD


This directory can be configured in your sys.config file:

	{mnesia, [{dir, "lib/erlang/lib/bar-0.1/priv/data"}]}



   -Vance