Oracle Solution for Error ora-38740

ORA-38740: Usable blocks value string is not valid.

What triggered the Error:

A flashback database log file header contained a usable blocks value greater than the file size. The flashback database log file file is corrupt.

What should we do to fix it:

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.