PostgreSQL中客戶端連線到伺服器端之後產生的程式情況

參考文章:https://www.postgresql.org/docs/10/static/protocol.html

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.

By 亨特少校