[erlang-questions] mnesia, ordered_set and disc_copies

[Philip Clarke]

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,{bad_type,user,disc_copies,nonode@nohost}}


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 ?

Thanks
Philip

[Jachym Holecek]

# Philip Clarke 2012-10-31:

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)
(foo@taiga)1> mnesia:create_schema([node()]).
ok
(foo@taiga)2> mnesia:start().
ok
(foo@taiga)3> mnesia:create_table(user, [{type, ordered_set},
{disc_copies, [node()]},
{attributes, [id, name]}]).
{atomic,ok}

BR,
-- Jachym
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[Philip Clarke]

Hi Jachym,

Yes, mnesia:create_schema is what I forgot to do.

Thanks for your help.

Philip