问题:
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 temporarytablespace.
C . It is the minimum time period up to which the committed undo data would be retained if free undo spaceis available.
D . It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.
● 参考解析
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