OCP考试052考题：1Z0-V8.02-第26题

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OCP考试052考题：1Z0-V8.02-第26题，完整题库请点击这里联系老师咨询了解

26. Which two statements are true regarding undo tablespaces? (Choose two.)

A.The database can have more than one undo tablespace.

B.The UNDO_TABLESPACE parameter is valid in both automatic and manual undo management.

C.Undo segments automatically grow and shrink as needed, acting as circular storage buffer for their

assigned transactions.

D.An undo tablespace is automatically created if the UNDO_TABLESPACE parameter is not set and the

UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up.

Answer: AC

答案解析：

A答案：可以有一个或多个undo表空间，A答案正确。

B答案：UNDO_TABLESPACE只能用于自动undo段模式，B答案错误

C答案：原段根据需要可自动增长和收缩，它充当所分配的事务处理的循环存储缓冲区。故正确

D答案：错误。是由DBCA自动创建或者由create database时手动创建或者create unod tablespace手动创建。