In case of Control File Failure, Create Control File cmd how get scn?

The following lines i picked from the
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:5033895918209
======================================================
1. We can use the 'alter database rename ' at mount stage to rename any datafile. Or is it not possible to rename the system datafile like this? Why?
2. What happens to the SCN information in the controlfile when a controlfile is recreated? How will the database sync the SCN with that of the datafiles?
If I issue a 'backup controlfile to <file>' at 8 am and then restore that controlfile binary backup at 10 am and try to open the database, it will give me a control file old error. I understand that it is because the SCN is not in sync. But if I issue a 'backup controlfile to trace' at 8 am and use that script to recreate a new controlfile at 10 am, why doesn't I get the error? Where does it get the SCN information then?
So what is the use of taking a binary copy of the controlfile. Looks like having a 'backup controlfile to trace' script is better than a binary backup. Do you agree? Why/whynot?
Followup August 16, 2002 - 2pm US/Eastern:
1) you could but I just always did it with the create controlfile statement.
When moving system -- I do it that way
When moving ANY OTHER tablespace -- i just offline it, move the files, rename the files online it.
2) it just happens.
The control file you create will read the files to figure out what is up.
I agree, I've never used a binary controlfile backup myself.
=========================================================
My Question- In the Point2 above "Where does it get the SCN information and how control file do SCN Sync with data files?
"

1. The CREATE CONTROLFILE reads SCNs from the DataFiles. If the
database was last shutdown, all the datafiles are "non-fuzzy" and have the same
SCN (as of the shutdown checkpoint), If the database or some of the files are from
are hot backup, you cannot open the database because the SCN of some files is
older (lower) than others -- that is why a RECOVER (DATABASE or DATAFILE) is
required.
See http://web.singnet.com.sg/~hkchital/Incomplete_Recovery_with_BackupControlfile.doc
2. I'm not sure I agree with Tom Kyte's response
"I agree, I've never used a binary controlfile backup myself. "
to the question
"So what is the use of taking a binary copy of the controlfile. Looks like having a 'backup controlfile to trace' script is better than a binary backup. Do you agree? Why/whynot?"
If you have lost your database (storage/filesystem failure) and all your datafiles are lost,
you cannot simply do a CREATE CONTROLFILE from a Trace -- because the
CREATE CONTROLFILE has to read and verify all the datafiles specified in the
CREATE statement. If you have an RMAN Repository, you can use that to restore
your database files but otherwise, the RMAN information about backups and backupsets
are in the binary controlfile.
That is why it is important to take binary controlfile backups either manually or
using RMAN or using CONFIGURE CONTROLFILE AUTOBACKUP ON.

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