[erlang-questions] mnesia, ordered_set and disc_copies

Philip Clarke <>
Thu Nov 1 10:42:44 CET 2012


Hi Jachym,

Yes, mnesia:create_schema is what I forgot to do.
Thanks for your help.

Philip


On Wed, Oct 31, 2012 at 9:09 PM, Jachym Holecek <>wrote:

> # Philip Clarke 2012-10-31:
> > Hi,
> >
> > I have a simple record defined as:
> > -record(user, {id, name}).
> >
> > Next I start up mnesia and try to create a table as follows:
> >
> > mnesia:create_table(user, [{type, ordered_set}, {disc_copies, [node()]},
> > {attributes, record_info(fields, user)}]).
> >
> > This gives me this error:
> > {aborted,{}}
> >
> >
> > If i change the table type to be ram_copies, everything works fine.
> > I realise that I cannot use disc_only_copies with ordered_set, but I
> > thought that disc_copies was supported.
> >
> > Am I doing something else wrong ?
>
> Did you forget to install disc_copies schema first? I don't think you can
> have disc_copies tables with ram_copies schema.
>
>   Eshell V5.8.5  (abort with ^G)
>   ()1> mnesia:create_schema([node()]).
>   ok
>   ()2> mnesia:start().
>   ok
>   ()3> mnesia:create_table(user, [{type, ordered_set},
>                                            {disc_copies, [node()]},
>                                            {attributes, [id, name]}]).
>   {atomic,ok}
>
> BR,
>         -- Jachym
>
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