Bryce Nesbitt wrote:
> Is autovac writing anything of import during its periodic wakeup on an
> idle cluster?
Autovacuum is not writing anything. What it is doing is asking whether
anyone has written anything -- and the stats collector responds by
writing these stat files.
The issue is that the timestamp-of-last-update bit, which is critical to
autovacuum, does not get written unless the whole file is. I guess it
is possible to optimize that, so that the file is not touched other than
the timestamp if the database has been completely idle. I have no idea
how complex this is, or whether this scenario is really worth
optimizing.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
