Tom Lane escribió:
> Are you saying you intend to revert that whole concept? That'd be
> okay with me, I think. Otherwise we need some thought about how to
> inform the stats collector what's really happening.
Maybe what we need is to consider table truncation as a separate
activity from vacuuming. Then autovacuum could invoke it without having
to do a full-blown vacuum. For this to work, I guess we would like to
separately store the status of the back-scan in pgstat somehow (I think
a boolean flag suffices: "were we able to truncate all pages that
appeared to be empty?")
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
