ORA-38741: Formatted blocks value string is not valid.
Cause: The formatted blocks value in the flashback database log file was greater than the file size. The flashback database log file was 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-38741错误是Oracle数据库中最常见的错误之一，表明用户提供的格式化块字符串无效。
此错误表明无效的格式化块字符串被引用，或者由函数系统或文件驱动器回调时发生了错误。
当在ONT命令的块格式化选项中提供无效的块大小值（不在可能取值范围内）时，ORA-38741错误会发生。
正确处理此错误需解决报告中相应的问题，重新指定块大小值（在期望的取值范围内）。可将可用的块大小可以在All_tables系统视图中查看。