You can start an instance in restricted mode (or later alter an existing instance to be in
restricted mode). This restricts connections to only those users who have been granted
the RESTRICTED SESSION system privilege.

以限制模式启动实例
管理员可以用限制模式启动实例 . 运行在限制模式下的实例只允许具有 RESTRICTED SESSION
系统权限的用户连接到数据库