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as in the object of the discussion thread I have the following situation: all time I start my linux OS, I check processes running with the top command in bash and I always find 7-8 postgres processes running. Why so? Are they daemon that start at the OS start? Should I deactivate them for better resource usage? And in which way can I stop definitevely them? And how can I reactivate them in future ? Thanks

top command

  • It's probably starting on boot. What distro and version of linux are you using? – Philip Kirkbride Dec 1 '17 at 20:32
  • If it's Ubuntu 16.04 try sudo systemctl disable postgres then restart and try top again. – Philip Kirkbride Dec 1 '17 at 20:33
  • @PhilipKirkbride I'm using Ubuntu 14.04. In a future postgres applicatio should I restart the service? – Alberto Dec 1 '17 at 20:42
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Try disabling postgres via upstart:

echo manual | sudo tee /etc/init/postgres.override

Based on this Q/A (shows methods for both systemD and upstart, if you have Ubuntu 14.04 you should have upstart).

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