Instance - Redo and Undo recovery question

I'm a little confused about how to undo and redo used to restore, please help me to clarify this point. If redo records changes (validations and database changes to cancel the revenge), don't do it again and undo all come from the log to roll forward to instance recovery? What is the source of the undo data, do it again save or cancel the segments that have been rebuilt using recovery logs?

Matt

In simple terms:
Source of redo - redo logs, source of cancellation - undo tablespace. Oracle applies again to the data files, including cancellations of TBS, first, then it restores the unvalidated data using TBS of cancellation.

Tags: Database

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