该规定（前面介绍的备份执行方式）是在首选项对话框中默认启用了创建备份文件选项。
The provision to create a backup file is enabled by default in the Preferences dialog box. You can choose to disable the option if it interferes with the speed of saving the project.
如果闪回区设置为可用，并且你又没指定FORMAT参数(参见Table 2 - 1)，那么RMAN在闪回区创建备份文件，并给备份起一个独一无二的名字。
If a flash recovery area is enabled, and if you do not specify the FORMAT parameter (see Table 2-1), then RMAN creates backups in the recovery area and automatically gives them unique names.
备份文件是指利用下载部分所提供的示例备份脚本，所创建的文件。
The backup files referred to are the ones that you create using the sample backup scripts provided in the Downloads section.
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