Unmount a Database (305)

After the database is closed, Oracle unmounts the database to disassociate it from the
instance. At this point, the instance remains in the memory of your computer.

After a database is unmounted, Oracle closes the control files of the database.

卸载数据库
1. 数据库被关闭后，Oracle 将卸载数据库，使之与实例分离 . 此时，实例依旧存在于计算机的内存中
2. 数据库被卸载后，Oracle 将关闭数据库的控制文件

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