文档解释
ORA-19603: cannot backup or copy active file with KEEP .. UNRECOVERABLE option
Cause: The user tried to copy or backup a file that was not closed cleanly, with KEEP .. UNRECOVERABLE option. This is not allowed because when restored, the file will require redo application before it is usable, and redo will not be saved because of KEEP .. UNRECOVERABLE option.
Action: Take the tablespace offline cleanly, or close the database and retry the copy or backup.
ORA-19603: cannot backup or copy active file with KEEP option表示，在使用KEEP 选项备份和拷贝活动文件时会出现此错误。这是一个Oracle 警告信息，表明KEEP 选项不可用于活动文件。
官方解释
常见案例
一般处理方法及步骤
（1）最简单的处理方法是更改ALTER DATABASE 命令的KEEP 选项，使其适应活动文件。
（2）尝试重新启动活动文件的数据库，以确保KEEP 选项应用到数据库中的所有文件。
（3）尽量避免在活动文件上使用KEEP 选项。如果必须在活动文件上使用KEEP 选项，则需要确保KEEP 选项所需的语句能正确应用到活动文件中。
