The three steps to shutting down a database and its associated instance are:
1. Close the database.
2. Unmount the database.
3. Shut down the instance.
A database administrator can perform these steps using Enterprise Manager. Oracle
automatically performs all three steps whenever an instance is shut down.
数据库和实例的关闭
1. 关闭数据库和相关实例的三个步骤如下
a. 关闭数据库
b. 卸载数据库
c. 停止实例
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