ORA-28429
        cannot encrypt or decrypt a data file on standby when it is open read-only
        
        
        Cause
        An attempt was made to encrypt or decrypt a data file on a standby database when it was already opened in read-only mode.
        Action
        Restart the standby instance in mount mode and retry the command.
        
     
    
    
        ORA-28429
        cannot encrypt or decrypt a data file on standby when it is open read-only
        
        
        Cause
        An attempt was made to encrypt or decrypt a data file on a standby database when it was already opened in read-only mode.
        Action
        Restart the standby instance in mount mode and retry the command.
        
     
    
    
        ORA-28429
        cannot encrypt or decrypt a data file on standby when it is open read-only
        
        
        Cause
        An attempt was made to encrypt or decrypt a data file on a standby database when it was already opened in read-only mode.
        Action
        Restart the standby instance in mount mode and retry the command.