12C-OCP升级1z-060-012

What are three purposes of the RMAN “FROM” clause?

A. to support PUSH-based active database duplication

B. to support synchronization of a standby database with the primary database in a Data

environment

C. To support PULL-based active database duplication

D. To support file restores over the network in a Data Guard environment

E. To support file recovery over the network in a Data Guard environment

Answer: B,D,E

正确答案解析：

DE:

* With a control file autobackup, RMAN can recover the database even if the current

control file, recovery catalog, and server parameter file are inaccessible.

* RMAN uses a recovery catalog to track filenames for all database files in a Data Guard

environment. A recovery catalog is a database schema used by RMAN to store metadata

about one or more Oracle databases. The catalog also records where the online redo logs,

standby redo logs, tempfiles, archived redo logs, backup sets, and image copies are

created.

这道题目，并不是很清楚他题目的意思