OCP-1Z0-053-V12.02-591题

591.Which type of backup must be performed first with an incremental backup?

A. Level 1

B. Level 0

C. Level 2

D. Level 3

Answer: B



RMAN can create multilevel incremental backups. Each incremental level is denoted by a value of 0 or 1.
A level 0 incremental backup, which is the base for subsequent incremental backups, copies all blocks containing data.
You can create a level 0 database backup as backup sets or image copies.

The only difference between a level 0 incremental backup and a full backup is that a full backup is never included in an incremental strategy.
Thus, an incremental level 0 backup is a full backup that happens to be the parent of incremental backups whose level is greater than 0.

官网参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmcncpt.htm#BRADV109

增量备份参考： /article/1348625.html

增量累积备份参考：/article/1348623.html