We need to change the DBID using NID. To do this the database can not be open. We startup mount and find that the database is open. What could be causing this condition? Startup NOmount also opens the database. This is Oracle EE 126.96.36.199. on Solaris 2.8.
If you perform SHUTDOWN IMMEDIATE followed by STARTUP MOUNT, then your database will not be OPEN. This can be verified by querying V$INSTANCE. When I perform these operations on Oracle 188.8.131.52 on Sun Solaris, I get the following:
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SQL> shutdown immediate
SQL> startup mount
ORACLE instance started.
SQL> select status from v$instance; STATUS
If you perform the same operations and the query from V$INSTANCE is reporting OPEN, then there must be some other process that is opening the database. Is it possible that you have a cron or OEM job that does something to this affect?