On Fri, May 13, 2005 at 03:52:38PM +0300, Mindaugas Riauba wrote:
>   Tables are not big (20000-150000 rows each) but have very high
> turnover rate - 100+ updates/inserts/deletes/selects per second.
> So contents of database changes very fast. Problem is that when
> pg_autovacuum does vacuum those changes slows down too much.
> And we keep autovacuum quite aggressive (-v 1000 -V 0.5 -a 1000
> -A 0.1 -s 10) to not bloat database and to avoid bigger impact.
> analyze seems not to impact performance too much.

Are you using the bgwriter?
See http://developer.postgresql.org/~wieck/vacuum_cost/ for details.

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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

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