The real details are as follows.

1. Shutdown the Oracle Database. shutdown immediate;

2. Startup the Oracle Database in a NOMOUNT State. startup nomount;

3. Alter system set control_files '<full OS file path and filename1>', '<full OS file path and filename2>' scope=spfile;

4. Copy or Move (Rename) control files, carefully from the OS level.

5. Startup mount force;

6. Alter database open;