pass - through会话允许直接提交sql语句和部分命令到一个远程服务器。
A pass-through session allows you to submit SQL statements and some subset of commands directly to a remote server.
在企业环境中，把sudo命令提交给远程主机最好是作为root用户使用ssh脚本来完成，对于无密码登录，还应该在主机之间交换密钥。
Rolling out sudo commands to remote hosts in an enterprise environment is best done using a SSH script as root, and the keys should have been exchanged between the hosts, for password-less logins.
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