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Which two statements are true regarding transactions in an Oracle database（）
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 tablespaceare used.

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出自：Oracle认证

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