"Not enough flashback database log data to undo FLASHBACK."
*Cause: There was not enough flashback log data to undo the flashback
so a flashback was not started.
*Action: It is still possible to get to the restore target by doing a flashback
until the resetlogs branch point of the restore target
is reached. This can be done by executing multiple "flashback
to before resetlogs" commands, or by doing a flashback to the exact time
or SCN of the desired resetlogs branch point. Note that this flashback
cannot be undone should an error occur. The only option is to complete