With Flashback Database, the time to recover a database is now proportional to the number of changes that need to be backed out (and not to the size of the database) because you do not have to restore data files.
The Oracle database periodically logs "before images" of data blocks in the Flashback Database logs. Bock images can be reused to quickly back out the data file changes to any time at which flashback logs are captured just before the desired target time. Then, changes from the redo log files are applied to fill in the gap (????? why applying the redo log?).
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