I will work on a messaging system. I wonder if it overuses the Server when Client sends requests to sql every minutes to check if there is a new messages? If it doesn't make sense, what is the most sensible way of achieving this?
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Short answer, no. Check out question though. XMPP seems to be popular: https://stackoverflow.com/questions/19464820/suitable-protocol-for-instant-messaging – Michael Jun 02 '17 at 15:21