"Ed L." <pgsql@bluepolka.net> writes:
> No, our autovac logs the number of changes (upd+del for vac, upd+ins+del for
> analyze) on each round of checks, and we can see it was routinely
> performing when expected. The number of updates/deletes just far exceeded
> the thresholds. Vac threshold was 2000, and at times there might be
> 300,000 outstanding changes in the 10-30 minutes between vacuums.
Well, in that case you probably want a lot less than "10-30 minutes"
between vacuums, at least for this particular table. I don't know how
one configures autovac for this, but I suppose it can be done ...
> max_fsm_relations = 1000 and max_fsm_pages = 10000.
Also you doubtless need max_fsm_pages a lot higher than that. A
conservative setting would make it as big as your whole database,
eg for a 10Gb disk footprint use 10Gb/8K (something upwards of
a million) FSM page slots.
regards, tom lane