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In which situation may the UNDO_RETENTION parameter be ignored， even if it is set to a value（）
A:when the data file of the undo tablespace is autoextensible
B:when there are more than one undo tablespaces available in the database
C:when the undo tablespace is of a fixed size and retention guarantee is not enabled
D:when the undo tablespace is autoextensible and retention guarantee is not enabled

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出自：Oracle认证

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