[erlang-questions] Mnesia table replication

Dana.RUBINO <>
Mon Nov 17 13:00:11 CET 2008


Ok I have given it a go with a test table as such:

-module(test).
-record(test, {id, name}).

test() ->
    mnesia:create_table(test, [{attributes, record_info(fields, test)}, {disc_copies, ['']}]).


I then create two local nodes on the same machine and start up Mnesia on each.

When looking at each node via the appmon I can see Mnesia has started - I can also ping one node from another.

When however I run the test method on one node expecting it to create a replica on the other I get the following error:

{aborted,{}}

Have I missed a step here perhaps?

Thanks,
Dan


________________________________
From: Chandru [mailto:]
Sent: 17 November 2008 11:13
To: RUBINO, Dana, GBM
Cc: 
Subject: Re: [erlang-questions] Mnesia table replication

Hi Dan,

2008/11/17 <<mailto:>>
Hi all,

Is it possible to have two nodes with each node containing a RAM copy AND and DISK copy?

I am thinking a command such as:

mnesia:create_table(xyz, [Attrs,
                                        {disc_copies, [nodeA, nodeB]},
                                        {ram_copies, [nodeA, nodeB]}
                                      ]).

Would this work?

There is no need to do that. A copy of disc_copies table is also stored in RAM.

Also, is there a way to verify which tables are being accessed i.e. through tv?

I don't think so. Out of curiosity, why would you want to do that?

cheers
Chandru

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