We don't know. You don't tell us what version you're running, show
us any EXPLAIN ANALYSE output, tell us about the data. . .
explain analyze delete from firma1.rid where dokumnr not in (select dokumnr
from firma1.dok)
produces
"Seq Scan on rid (cost=7703.59..98570208.00 rows=101210 width=6) (actual
time=7269933.877..7269933.877 rows=0 loops=1)"
" Filter: (NOT (subplan))"
" SubPlan"
" -> Materialize (cost=7703.59..8537.22 rows=55963 width=4) (actual
time=0.007..18.707 rows=25313 loops=202421)"
" -> Seq Scan on dok (cost=0.00..7373.63 rows=55963 width=4)
(actual time=40.236..3353.985 rows=56079 loops=1)"
"Total runtime: 7269944.251 ms"
As I understand this took 2.2 hours to run
Andrus.
