How can I tell if an Oracle database is mounted and activated?

I got it!

CONTROLFILE_TYPE from v$database is the key

 SQL> select CONTROLFILE_TYPE from v$database; 

 CONTROL
 -------
 CURRENT

versus

 SQL> select CONTROLFILE_TYPE from v$database; 

 CONTROL
 -------
 STANDBY

This works for a physical standby, Oracle 10g (and higher)

SELECT open_mode FROM v$database;

If the value is:

'MOUNTED', your database is mounted.
'READ WRITE', then you can assume it's been activated.
'READ ONLY' then it might be opened for query in read only mode, but not activated.
'READ ONLY WITH APPLY' when using active dataguard.

On primary:

select database_role from v$database;

DATABASE_ROLE
----------------
PRIMARY

On slave:

OPEN_MODE
--------------------    --------------------
MOUNTED              or READ ONLY WITH APPLY

There might be other values as well, I'm not sure.

HTH

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