数据库数据文件丢失、造成数据库崩溃，然后做全库rman备份，删除坏了的数据文件-Database data files are missing, resulting in a database crash, and then do the whole database rman backup, delete the bad data file

当oracle数据库缺失scott用户时，创建scott用户的办法-When the oracle database is missing scott user to create user scott way