Josh Berkus <josh@agliodbs.com> writes:
> I've just been tweaking some autovac settings for a large database, and
> came to wonder: why does vacuum_max_freeze_age default to such a high
> number? What's the logic behind that?
(1) not destroying potentially useful forensic evidence too soon;
(2) there's not really much to be gained by reducing it.
regards, tom lane