Kaloyan Iliev Iliev <kaloyan(at)digsys(dot)bg> writes:
> We recently upgrade our server from PG8.2 to 8.4.
> ...
> Here I will post explain analyze. If you think it is necessary I will
> post the exact query:
> http://explain.depesz.com/s/J0O
Yeah, you need to show the query. It looks like the performance problem
is stemming from a lot of subselects, but it's not clear why 8.4 would
be handling those worse than 8.2.
regards, tom lane