[erlang-questions] aborted, bad_type when creating Mnesia disc only table
Nicolas Charpentier
nc@REDACTED
Sun Apr 20 18:54:20 CEST 2008
Petr Sturc wrote:
> Hello,
>
> beginners question - when doing
>
> mnesia:create_table(order,[{disc_only_copies,
> [node()]},{attributes,[id,customerid,inputfile,creationdate,
> finisheddate, duedate, quantity]}])
>
> I am getting error
>
> {aborted,{bad_type,order,disc_only_copies,nonode@REDACTED}}
>
> I am not able to spot the problem. Any idea?
> Thanks in advance,
>
Hi,
I succeed to reproduce your problem.
You might have a problem with your schema.
As you want to create a disc_only_copies you have to tell mnesia where
to store table on disc.
Basically, this is done with:
- a mnesia environement variable: mnesia dir. It's the location of your
tables on disk.
- the schema creation: mnesia:create_schema/1.
Here are the command to create your table
$ erl -mnesia dir my_location
Erlang (BEAM) emulator version 5.5.5 [source] [async-threads:0] [hipe]
[kernel-poll:false]
Eshell V5.5.5 (abort with ^G)
1> mnesia:create_schema([node()]).
ok
2> mnesia:start().
ok
3>
mnesia:create_table(order,[{disc_copies,[node()]},{attributes,[id,customerid,inputfile,creationdate,
finisheddate,duedate,quantity]}]).
{atomic,ok}
4>
Look at mnesia user's guide for my information about schema operations.
http://www.erlang.org/doc/apps/mnesia/part_frame.html
Regards,
Nicolas Charpentier
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