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Longpolling effect on the server

I am currently executing a longpolling script during a while (true) loop. PHP is set_time_limitset to 0. There is an Apache server with another nginx server connecting to the first. I pull text from a MySQL table through this longpolling script. I want to know if this process will interfere with server performance. If so, to what extent, if there are a large number of simultaneous users who pull data? Should I put nginx on top of php-fpm?

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Long polling has several notable properties on the server

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Source: https://habr.com/ru/post/1530294/

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