The primary function of resetlogs is to discard the redo that was not
applied during incomplete recovery, ensuring that the skipped redo
can never be accidentally applied by a subsequent recovery. To
accomplish this, resetlogs effectively invalidates all existing redo
in all online and archived redo logfiles. This has the side effect of
making any existing datafile backups unusable for future recovery
operations.
Resetlogs also reinitializes the controlfile information about online
logs and redo threads, clears the contents of any existing online
redo log files, creates the online redo log files if they do not
currently exist, and resets the log sequence number in all threads to
one.
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