Using thisview, you can better estimate the amount of undo space required for the currentworkload.
通过这个视图，用户可以更好地估计在当前工作负荷下系统所需的undo空间容量。
RETENTION parameter works best if the current undo tablespace has enough space for the active transactions.
retention能做好地工作如果——当前的回滚表空间对活动事务有足够的空间。
As work progresses in a transaction, an application can append the undo information and reserve space for compensation records.
当工作在交易中进行时，应用程序可以附加复原资讯并保留补偿记录的空间。
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