Oracle : Ошибка ORA-38704

"Checksum error in flashback database log file header."
*Cause: The flashback database log file header contained a
checksum that does not match the value calculated from the file
header as read from disk. This means the file header was
*Action: If you are doing a FLASHBACK DATABASE, then the flashback
cannot be performed because of the corrupted log. A restore
and an incomplete recovery must be performed instead.

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