Is level 0 backup = whole backup ?

The level 0 backup is a start point that contains all blocks.
if so, is it same as whole database backup?
if so, why it called incremental level 0 backup?
a bit confused.

Its a terminology that makes it confusing. Its indeed the whole backup but in the incremental backup, it serves as the base as well. In oracle. there are terms like this. For example, oracle uses in the B/R manuals , two terms for the backup, whole database backup and full database backup, when actually there is just one command, Backup Database. But the terminology says, if you include your archive logs, spfile with the data files and control files, its whole backup otherwise, its just full backup. This is the similar kind of thing, so don't be confused.
Rest of the details are in that link which is already given to you. Have a good read of it.
HTH
Aman....

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