ok,
you calculate headline() 19861 times, while you need only 20.
Use subselect and will be surprized
Oleg
On Thu, 2 Oct 2008, Matthew Terenzio wrote:
> Thanks Tom, Sorry if that last post went over multiple times. I was getting
> a mailing failure (or so I thought)
>
> here is EXPLAIN ANALYZE . I really need to work on my skills at analyzing
> these:
>
> Limit (cost=105505.78..105505.83 rows=20 width=655) (actual
> time=74806.973..74807.037 rows=20 loops=1)
>
> -> Sort (cost=105505.78..105555.44 rows=19861 width=655) (actual
> time=74806.968..74806.989 rows=20 loops=1)
>
> Sort Key: stories."timestamp"
>
> -> Nested Loop (cost=0.00..90497.94 rows=19861 width=655)
> (actual time=720.251..74798.672 rows=680 loops=1)
>
> -> Function Scan on q (cost=0.00..12.50 rows=1000
> width=32) (actual time=0.013..0.017 rows=1 loops=1)
>
> -> Index Scan using description_index on stories
> (cost=0.00..90.14 rows=20 width=623) (actual time=700.633..63243.713
> rows=680 loops=1)
>
> Index Cond: (stories.vectors @@ "outer".q)
>
> Total runtime: 74847.177 ms
>
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
