"Kaufhold, Christian (LFD)" <> writes:
> I have the following query that I run agains postgresql 8.2:
> But when I run analyse the same query runs for hours.
Seems like the core of the problem is here:
> -> Seq
> Scan on massnahmeobjekt m (cost=0.00..3271.88 rows=1 width=94) (actual
> time=0.387..577.771 rows=3694 loops=1)
> Filter: ((aktennummer)::text ~* 'M\\-2009\\-1'::text)
If that rowcount estimate weren't off by three orders of magnitude you
probably would be getting a more appropriate plan. The first thing you
could try is increasing the statistics target for aktennummer. Also,
if you're running in a non-C locale and this is 8.2.5 or older, try a
more recent 8.2.x. Updating to 8.3 or 8.4 might help even more.
regards, tom lane