单选题
发布日期:2020-04-10
The extents in undo tablespace retain data until the next full database backup.
The extents containing committed data in the undo tablespace are never overwritten.
The extents which no longer contain uncommitted data in the undo tablespace are not overwritten for at least15 minutes.
The extents containing committed data in the undo tablespace are not overwritten until the instance is shut down.
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