Is a Level 0 Incremental the same as Backup Database?

hi experts,
This is a 10g database running in archivelog mode.
This is the backup scheme I'm currently using:
backup database plus archivelog; (runs once per day)
backup incremental level 1 database; this runs every 3 hours
(All the incrementals I make are level 1.)
In another forum, I was advised to make a level 0 incremental backup, because you cannot restore a level 1 if there was no level 0 made earlier. Now, I'm looking for the RMAN expert's advice :-)
** If I do this will I have what I need to be able to restore: **
- backup incremental level 0 database; (this will run once per day)
- backup incremental level 1 database; (this will run every 3 hours
In other words, will I miss anything if I dont do a backup database ?
Thanks, John

If you taking level 1 backup and If you dont have any level 0 then RMAN take hole database backup (level 0) with level 1 command.
It is always advisible to take level 0 and follow the level 1.
I advise to see the below doc which covers all your doubts and best way to backup.
Hope this solves your issue.
http://www.mcs.csueastbay.edu/support/oracle/doc/10.2/backup.102/b14192/bkup004.htm
Regards
Satishbabu Gunukula
Click here to improve[ RMAN backup Performance |http://oracleracexpert.blogspot.com/2009/09/block-change-tracking-in-oracle-10g.html]

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Is a Level 0 Incremental the same as Backup Database?

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