为了高效地服务多个客户端，PostgreSQL服务器为每个客户端启动一个新的“后端”进程。在当前实现中，一旦检测到传入连接，就会立即创建一个新的子进程。从协议的角度来看，术语“后端”和“服务器”可以互换使用；同样，“前端”和“客户端”也可以互换。
作者：瀚高PG实验室 （Highgo PG Lab）- 亨特少校
参考文章:PostgreSQL: Documentation: 10: Chapter 52. Frontend/Backend Protocol
In order to serve multiple clients efficiently, the server launches a new “backend” process for each client.
In the current implementation, a new child process is created immediately after an incoming connection is detected.
This is transparent to the protocol, however. For purposes of the protocol, the terms “backend” and “server” are interchangeable;
likewise “frontend” and “client” are interchangeable.
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