Again, I don't see how this belongs into the tutorial. It is mostly
advanced low-level information that is irrelevant for someone starting
up, it is not hands-on, so quite unlike the rest of the tutorial, and
for the most part the information just duplicates what is already
explained elsewhere.
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Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services