standby physical couldnot query v$database

all,

I have a physical standby database, but a little error comes when open
read only and again MRP apply.

startup nomount;
alter database mount standby database;
alter database managed standby database disconnect from session;
select open_mode from v$database;
-- yield mount

alter database managed standby database cancel;
alter database open read only;
select open_mode from v$database;
-- yield read only

-- back activate MRP
alter database managed standby database disconnect from session;
select open_mode from v$database;
-- yield error, that v$database could not query
-- but i can still query other v$ views, such as v$instance, v$datafile , etc


--
regards
ujang
--
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