本文探讨了在未启用保留保证的情况下，UNDO_RETENTION参数的作用。它定义了如果存在空闲撤销空间，则已提交撤销数据至少保留的最短时间段。
31.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 is available.
D.It is the time period after which the undo data is transferred to the Flash Recovery Area to provide read consistency.
答案：C
解析：当retention没有设置为guarantee的时候，UNDO_RETENTION这个参数有啥作用
个人感觉没啥作用，该undo不够就覆盖了，undo多的时候就在那里保存的
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 is available.
D.It is the time period after which the undo data is transferred to the Flash Recovery Area to provide read consistency.
答案：C
解析：当retention没有设置为guarantee的时候，UNDO_RETENTION这个参数有啥作用
个人感觉没啥作用，该undo不够就覆盖了，undo多的时候就在那里保存的
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