OCP-1Z0-052-V8.02-4题

4. Your test database is running in NOARCHIVELOG mode. Which statement is true regarding the type of

backups that can be performed on the database?

A.You can perform online whole database backups.

B.You can perform offline whole database backups.

C.You cannot perform schema-level export/import operations.

D.You can perform the backup of only the SYSTEM tablespace when the database is open.

Answer: B

答案解析：

参考： http://blog.csdn.net/rlhua/article/details/12617847

在非归档模式下，只能在数据库未打开的情况下做一致性的冷备份，即脱机备份。所以选B.

是因为进行备份时，数据文件头中的系统更改号(SCN) 与控制文件中的SCN 相匹配。