（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

答案：（B、C）

解析：

B，24*7服务方式的数据库只能进行热备，所以数据库必须是归档模式

C，如果要备份某个表空间，则要用命令使表空间进入备份状态，目的是为了数据块一致性；如果要备份整个数据库，则要使整个数据库进入备份状态。

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Oracle 11G OCP 1Z0-053 608