608.You are managing a 24*7 database. The backup strategy for the database is to perform
user-managed backups.
Identify two prerequisites to perform the backups. (Choose two.)
A. The database must be opened in restricted mode.
B. The database must be configured to run in ARCHIVELOG mode.
C. The tablespaces are required to be in backup mode before taking the backup.
D. The tablespaces are required to be in read-only mode before taking the backup
Answer: BC
答案解析：
参考：http://blog.csdn.net/rlhua/article/details/12682217
执行用户管理的数据库备份:操作过程取决于数据库是否处于ARCHIVELOG模式。如果是，则通过在复制表空间的数据文件之前将每个表空间置于备份模式，可以使数据库处于打开且可用状态。否则，在复制数据文件之前必须先关闭数据库。