Tangent: the second link in the Google search is this PDF slideshow: * https://www.pgcon.org/2019/schedule/attachments/514_introduction-memory-contexts.pdf htt

Tangent: the second link in the Google search is this PDF slideshow: * https://www.pgcon.org/2019/schedule/attachments/514_introduction-memory-contexts.pdf https://www.pgcon.org/2019/schedule/attachments/514_introduc... The 'bread crumb navigation' at the top of each slide is a clever idea.