What exactly happens when datafile is put in backup mode ?

Dear Friend,
i want to know what exactly happens when a datafile is put in backup mode ?
that is what happens between Begin Backup ........................... end backup
with regards.

When u start hot backup via 'alter tablespace begin backup', the tablespace headers are marked as such. The dirty data buffers that belong to the database files are written out to the files and the datafiles are check pointed. The headers are updated with SCN @ the time the backup commences. It is the data file headers that were not updated until the 'alter tablespace end backup' is issued.
The database files still continue to be read and updated. Recovery will commence from the scn written at the commencement of the backup and it is the changes written to the redo\archive logs during the backup that are rolled forward during recovery
Cheers,
Bin

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