Originally posted by Sonia
.... in the mount phase it is automatically reflected in the control file, during which there is no server proess started.....
What makes you think there is no server process started when database is mounted? In mount phase, the instance is allready started and functioning - SGA is formed, background processes started, it is only the database files that are not opened yet.

If you check the process scheme (Figure 8-2 in Concepts manual) http://download-west.oracle.com/docs...rocs.htm#18128, it clearly indicates which server processes are responsible for updating control file information: LGWR, CKPT and ARCn. There might be some othere process that interacts with controlfiles that are not indicated on that picture, but those three are the main contributors for controlfile information.