ORA-38740
        Usable blocks value string is not valid.
        
        
        Cause
        A flashback database log file header contained a usable blocks value greater than the file size.  The flashback database log file file is corrupt.
        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.
        
     
    
    
        ORA-38740
        Usable blocks value string is not valid.
        
        
        Cause
        A flashback database log file header contained a usable blocks value greater than the file size.  The flashback database log file file is corrupt.
        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.
        
     
    
    
        ORA-38740
        Usable blocks value string is not valid.
        
        
        Cause
        A flashback database log file header contained a usable blocks value greater than the file size.  The flashback database log file file is corrupt.
        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.