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： http://blog.youkuaiyun.com/rlhua/article/details/11763453

增量累积备份参考： http://blog.youkuaiyun.com/rlhua/article/details/11763671