How long does mnesia take to warm up?

Joe Armstrong (AL/EAB) joe.armstrong@REDACTED
Thu Sep 8 16:06:40 CEST 2005

   When I evaluate mnesia:start() it seems to take a little time before mnesia is
ready to do what I tell it - is this a bug? - do I really have to busy-wait
before it is ready?

   I have made myself a little mnesia table called mom_types
   In this run I have to make 34 attempts to write the table, attempts 1 to 34 fail because there is no such table, but 35 succeeds because suddenly there *is* a table.

   Alternatively I can wait for half a second or so after starting mnesia
   I guess this is a synchronisation error in the start-up?


Eshell V5.3  (abort with ^G)
1> bug:start()
Oh dear N=0 {aborted,{no_exists,mom_types}}
Oh dear N=1 {aborted,{no_exists,mom_types}}
Oh dear N=33 {aborted,{no_exists,mom_types}}
Oh dear N=34 {aborted,{no_exists,mom_types}}
At last N=35 ok



start() ->

do(N) ->
    V = mnesia:transaction(fun() ->
    case V of
	{atomic, X} ->
	    io:format("At last N=~w ~p~n",[N, X]),
	Other ->
	    io:format("Oh dear N=~w ~p~n",[N, Other]),

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