分享一下我老師大神的人工智慧教程！零基礎，通俗易懂！http://blog.csdn.net/jiangjunshow

也歡迎大家轉載本篇文章。分享知識，造福人民，實現我們中華民族偉大復興！

24. Which two statements correctly describe the relation between a data file and the logical database

structures? (Choose two.)

A.An extent cannot spread across data files.

B.A segment cannot spread across data files.

C.A data file can belong to only one tablespace.

D.A data file can have only one segment created in it.

E.A data block can spread across multiple data files as it can consist of multiple operating system (OS)

blocks.

Answer: AC  

答案解析：

從下圖可以看出，一個數據檔案只能屬於一個表空間。而資料檔案和extent也是一對一的，即是說資料檔案不能誇區，但可以誇段。

給我老師的人工智慧教程打call！http://blog.csdn.net/jiangjunshow