Oracle : Ошибка ORA-38712

"Corrupt flashback log record header: block %s, offset %s."
*Cause: A corrupt flashback database log record header was read.
Either the record type or length were incorrect.
More information was dumped to the trace file.
*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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