Doubt regarding internal activity about snapshot controlfile

We knows that to maintain Read consistency, RMAN create a duplicate read consistent version of current control file known as snapshot control file. Now from docs, it has been mentioned that “RMAN needs a snapshot control file only when resynchronizing with the recovery catalog or when making a backup of the current control file”. I have a RMAN backup script where after allocating channels it is first taking whole database backup and then archivelog backup is taken once whole database backup is complete. In the end, it is taking current control file backup, now two doubts here:
1) We know that at the start of backup rman needs to resysnc recovery catalog with current control file - so a snapshot control is created before initiating full backup of the database?
2) Now in the end once when the whole database backup & archivelog backup is complete , while taking current controlfile backup as per written script, does it again create a new snapshot controlfile or just the snapshot controlfile is accessed and does the snapshot controlfile remains in locked state(read only) during entire backup operation ?
Any explanation behind these internals will be highly appreciated.
Edited by: 918868 on May 14, 2013 9:27 AM

Hi,
1) We know that at the start of backup rman needs to resysnc recovery catalog with current control file - so a snapshot control is created before initiating full backup of the database?
I think snapshot controlfile is not created before initiating the backup because RMAN synchronize the recovery catalog with controlfile at the end of backup operation so that latest backup information also gets update to the recovery catalog.
2) Now in the end once when the whole database backup & archivelog backup is complete , while taking current controlfile backup as per written script, does it again create a new snapshot controlfile or just the snapshot controlfile is accessed and does the snapshot controlfile remains in locked state(read only) during entire backup operation ?
Yes snapshot controlfile is created while taking controlfile backup.
Thanks

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