PROBLEM:

After restoring standby database from RMAN backup, got below error, while mounting standby database , getting below error.

ORA-01665: control file is not a standby control file

SOLUTION: Check the database_role of STANDBY

sql> SELECT database_role FROM v$database;

DATABASE_ROLE
—————-
PRIMARY

Convert to standby database.

 sql> Alter database convert to physical standby;

Now mount again:

 
sql> startup mount;

sql> SELECT database_role FROM v$database;

DATABASE_ROLE
—————-
PHYSICAL STANDBY

Start recovery

 sql> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE disconnect from session;