How do you configure a fragmented Mnesia table?

Fragmentation is set up via the frag_properties option on mnesia:create_table/2, specifying how many fragments to create and how to distribute them across nodes.

mnesia:create_table(sessions,
    [{frag_properties,
        [{node_pool, [node1@host, node2@host, node3@host]},
         {n_fragments, 3}]},
     {attributes, [id, user, expiry]}]).

Once configured, ordinary API calls like mnesia:write/1 and mnesia:read/1 work exactly as they would on a normal table — the fragmentation logic (routing to the right fragment based on key hash) is handled transparently underneath by the mnesia_frag access-context module, so application code doesn't need to know or care which fragment a given record actually lives in.

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