title: What is postgresql select process?
body: <p>we are using postgresql for our application.
  after a time, idle CPU was less than 20%.
  we understood select and idle process caused it, but we don't understand what does mean select process.
  can anyone help we?</p>
  <p><a href="https://i.stack.imgur.com/zm8uo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zm8uo.png" alt="enter image description here" /></a></p>