Performance of mnesia:select/2

If I need to lookup a list of keys which is the better approach? Why?

Fselect = fun(Keys) ->
        MatchHead = {'_', '$1', '$2'},
        F = fun(Key) ->
                {'=:=', '$1', Key}
        end,
        MatchConditions = [list_to_tuple(['or' | lists:map(F, Keys)]),
        MatchBody = ['$_'],
        MatchFunction = {MatchHead, MatchConditions, MatchBody},
        MatchExpression = [MatchFunction],
        mnesia:select(Table, MatchExpression)
end,
mnesia:transaction(Fselect, [Keys]).

Fread = fun F([Key | T], Acc) ->
                [R] = mnesia:read(Table, Key),
                F(T, [R | Acc]);
        F([], Acc) ->
                lists:reverse(Acc)
end,
mnesia:transaction(Fread, [Keys. []]).


--
     -Vance