Oracle 11G OCP 1Z0-052 27

（27）Which two statements are true regarding transactions in an Oracle database? (Choose two.)

A.Multiple transactions can use the same undo segment.

B.A transaction is assigned an undo segment when it is started.

C.More than one transaction cannot share the same extent in the undo tablespace.

D.The transactions use system undo segment to store undo data if all the segments in the undo tablespace are used.

答案：（A、B）

解析：

C（X）. 多個事務可以共享一個段，而段是由extent組成的，所以多個事務可以共享多個extent

D（X）. 應該是迴圈使用

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