Is it possible to backup incremental without having full ?

Hi,
in 10g R2 I have done an incremental backup (level 1) of my database without having a FULL BACKUP. I wonder how RMAN can do this. I thought that incremental can be done comparing to a full existant backup. Can you explaine me please ? Thank you.

from the doku:
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmconc1005.htm#sthref241
Incremental Backup Algorithm
Each data block in a datafile contains a system change number (SCN), which is the SCN at which the most recent change was made to the block. During an incremental backup, RMAN reads the SCN of each data block in the input file and compares it to the checkpoint SCN of the parent incremental backup. (If block change tracking is enabled, RMAN does not read the portions of the file known to have not changed since the parent incremental backup.) If the SCN in the input data block is greater than or equal to the checkpoint SCN of the parent, then RMAN copies the block.
means if there is no parent then every block has a greater SCN and the first incremental 1 is an full backup.

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Is it possible to backup incremental without having full ?

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