Does an Oracle incremental level 1 backup need archive logs to identify the differences since the last incremental level 0 (full) backup?

Question

Let's say we do a full incremental level 0 backup (full database backup) and then, for some reason, we need to delete some archive logs (generated after the full database backup) and then run an incremental level 1 backup (incremental backup). Will this incremental backup be okay without the deleted archive logs? Or does it need those archives to know the differences since the level 0 (full) backup? (I know we must have the archives logs after incremental level 1 to do a full recovery).

If no, how Oracle track those differences since incremental level 0 (without block change tracking)?

Answer 1

SCN is written to every block so RMAN get SCN of full backup and backup only blocks with SCN later than the full one. No archive logs are required