Oracle : Ошибка ORA-38796

"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
the flashback.

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