One Addition:
> PostgreSQL 8.1.4 (The one which is taking... a very long time...)
>
> Merge Join (cost=7751.81..50026810.45 rows=7364 width=4)
> Merge Cond: ("outer".sid = "inner".sid)
> -> Index Scan using stud_pkey on stud s (cost=7751.81..49994210.01
> rows=56607 width=4)
> Filter: (NOT (subplan))
> SubPlan
> -> Materialize (cost=7751.81..8497.94 rows=53613 width=4)
> -> Seq Scan on stud_vera (cost=0.00..7488.20
> rows=53613 width=4)
> Filter: (veraid = 2)
> -> Index Scan using stud_vera_sid_veraid_idx on stud_vera v
> (cost=0.00..37646.74 rows=14729 width=4)
> Index Cond: (veraid = 34)
The interesting thing is that (like I've written in the main post) if I
remove the 'AND veraid=34' it working fine (0.3seconds). The explain for
this working query is:
Merge Join (cost=45500.73..46741955.20 rows=147288 width=4)
Merge Cond: ("outer".sid = "inner".sid)
-> Index Scan using stud_pkey on stud s (cost=7734.28..46701101.71
rows=56607 width=4)
Filter: (NOT (subplan))
SubPlan
-> Materialize (cost=7734.28..8431.06 rows=50078 width=4)
-> Seq Scan on stud_vera (cost=0.00..7488.20
rows=50078 width=4)
Filter: (veraid = 2)
-> Sort (cost=37766.46..38502.90 rows=294576 width=4)
Sort Key: v.sid
-> Seq Scan on stud_vera v (cost=0.00..6751.76 rows=294576
width=4)
