向证书用户授予访问数据库对象所需的权限。
Grant the certificate user the required permissions on the database objects.
返回登录名和用户名的内置函数会返回调用方的名称，而不是证书用户的名称。
Built-in functions that return login and user names return the name of the caller, not the certificate user name.
此证书用作用户向网络中任何机器证明其真实性的凭证。
This certificate ACTS as a credential of the user to prove its authenticity to any machine in the network.
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