OCP-1Z0-053-V12.02-550题

550.What is the correct order of steps to perform an online database backup?

A. alter database begin backup;

B. alter database end backup;

C. Back up the database datafiles.

D. Back up the archive log files.

E. alter system switch logfile;

F. a, b, c, d, e

G. e, d, a, b, c

H. a, c, b, d, e

I. d, b, c, a, e

J. a, c, b, e, d

Answer: E

答案解析：

sys@TEST1107> alter database begin backup;

Database altered.

开始讲数据库置为备份状态

OS级拷贝文件

结束数据库的备份状态

sys@TEST1107> alter database end backup;

Database altered.

切换日志，使日志归档

在OS级别拷贝归档日志文件

sys@TEST1107> alter system switch logfile;

System altered.