Why cant the controlfile be in sync, when using backup controlfile

hi all,
i understand a few point ...from a dba friend of mine..
you need a resetlog to sync the datafile headers and the controlfiles
1) you need a resetlog when doing incomplete recovery
2) you can recovery completely using a backup controlfile provided you have all the necessary archived logs and online redo logs.
3) but in order not to do resetlog after 2) , you must re-create the controlfile
my questions are
q1) are the following point above true ?
*q2)  why cant oracle update the controlfile when recovering using the backup controlfile ? in that case, i do not need to recreate a controlfile , isnt it ?
Rgds,
Noob

user12050668 wrote:
hi hermant,
q1) why would i need to open the database with resetlog ?
Yes. i am using a backup controlfile, but i have all the archived and online redologs till point of failure ?
The purpose of a resetlog is to sync the controlfile and datafile headers , isnt it ? but i do not need to sync, as i have all the latest applied
am i right ?
If you use RECOVER DATABASE USING BACKUP CONTROLFILE in this case control file type is *"BACKUP"* but not *"CURRENT"* due to even you have all archivelogs and online logs you have to open database RESETLOGS statement.Actually after applying all archive and online redo logs ALTER DATABASE OPEN RESETLOGS internally sync and "Say" to control files "RECOVER FINISHED".Because CF type is BACKUP.
q2) You need to OPEN RESETLOGS. You can choose to create controlfile OR not create controlfile (i.e. open with the backup controlfile that was used for the RECOVER).
If you do a CREATE CONTROLFILE it has to be CREATE CONTROLFILE RESETLOGS, followed by ALTER DATABASE OPEN RESETLOGS.
in what circumstances, would i need to re-create the controlfile when i can still use the backup controlfile ? as in any case, i would still need to resetlog.
Rgds,
NoobIf you have backup controlfile then do not need recreate control files.And you need use backup control file.If you lost all backup of control files and copies then or you want change database name then you can use RECREATE CONTROL FILE again.

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