Level 0 incremental backup

Hi,
is the level 0 incremental backup a full backup ?
Thank you.

Stellios wrote:
A level 0 backup is not the same as a full backup in that you cannot perform an incremental backup over a full but only over an incremental level 0. So for a large database this may affect your backup strategy (backup running overtime because of no level 0 to start with and implicitly creating one).
"A level 0 backup must exist as the base backup for an incremental strategy. An incremental backup at level 0 is identical in content to a full backup, but unlike a full backup the level 0 backup is considered a part of the incremental strategy. If no level 0 backup exists when you run a level 1 backup, then RMAN makes a level 0 backup automatically."
See INCREMENTAL LEVEL:
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14194/rcmsynta009.htm#i1009966
Correct.
Level 0 backup is not same as full backup because it's not possible to take level 1 backup after nonincremental full backup
Level 0 backup is identical in content to full backup because they both take backup of ONLY used data blocks
To show it, backup database as "full backup" and as "level 0 incremental backup" and check sizes:
RMAN> backup database;
piece handle=C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTRMAN\BACKUPSET\2009_09_06\O1_MF_NNNDF_TAG20090906T103503_5B6LJ8FO_.BKP
RMAN> backup incremental level 0 database;
piece handle=C:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\TESTRMAN\BACKUPSET\2009_09_06\O1_MF_NNND0_TAG20090906T103603_5B6LL4CQ_.BKP
RMAN> exit
C:\oracle\product\10.2.0\flash_recovery_area\TESTRMAN\BACKUPSET\2009_09_06>dir
Volume in drive C has no label.
Volume Serial Number is 303A-82D4
Directory of C:\oracle\product\10.2.0\flash_recovery_area\TESTRMAN\BACKUPSET\20
09_09_06
06.09.2009  10:36    <DIR>          .
06.09.2009  10:36    <DIR>          ..
06.09.2009  10:36         7 143 424 O1_MF_NCSN0_TAG20090906T103603_5B6LMM5C_.BKP
06.09.2009  10:35         7 143 424 O1_MF_NCSNF_TAG20090906T103503_5B6LKQG5_.BKP
06.09.2009  10:36       535 527 424 O1_MF_NNND0_TAG20090906T103603_5B6LL4CQ_.BKP
06.09.2009  10:35       535 527 424 O1_MF_NNNDF_TAG20090906T103503_5B6LJ8FO_.BKP
               4 File(s)  1 085 341 696 bytes
               2 Dir(s)  13 859 717 120 bytes free
C:\oracle\product\10.2.0\flash_recovery_area\TESTRMAN\BACKUPSET\2009_09_06>As you see, size of both backups is same. Although one of the is full backup, another one is "level 0 incremental backup"

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