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Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled（）
A:It is the time period after which the undo data becomes obsolete.
B:It is the time period after which the committed undo data would be transferred to a temporary tablespace.
C:It is the minimum time period up to which the committed undo data would be retained if free undo space isavailable.
D:It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.

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出自：Oracle认证

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