默认情况下，Shorewall的安装是没有规则的，允许完全访问。
By default, Shorewall is installed with no rules, allowing complete access.
DBADM 权限允许用户在一个实例中的特定数据库上执行管理任务，还允许完全访问这个数据库中的数据和对象。
The DBADM authority allows a user to perform administrative tasks on a specific database in an instance and allows full access to the data and objects in that database.
在此阶段，我们完全关闭系统；不允许客户访问任何数据库。
At this stage, we are shutting down the system completely; customers are not allowed to access any databases.
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