redo logs

From: <bulbultyagi_at_now-india.net.in>
Date: Sat, 17 May 2003 18:08:30 -0800
Message-ID: <F001.0059BF24.20030517180830@fatcity.com>

Hello list

the "backup and recovery concepts" manual says :"Each redo record contains both the old and the new values. Oracle also records the old value to an undo block located either in a rollback segment (if running in manual undo management mode) or in a dedicated undo tablespace (if running in automatic undo management mode)."

Does this mean that undo data is stored in both the undo tablespace and the redo
logs ?

I thought that only statements were stored in the redo log file.

If undo data is stored in the redo logs also, then , do we need the undo tablespace during recovery ? shouldn't the redo logs be enough ?

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Author: <bulbultyagi_at_now-india.net.in
  INET: bulbultyagi_at_now-india.net.in

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