Hi all :)
I'm here again.
This time I'll provide more details (explain analyze, data-type, and
indexes), hope it will be enough :)
The query that is performing a plan that i do not understand is the
following:
select [some fields from all 3 tables]
from
DATA_SEQUENCES
join
I may (or may not) have found the solution: a reindex on the 3 tables fixed
the query plan. Now I can plan to reindex only the involved indexes at the
start of the data import procedure.
On Wed, Oct 31, 2012 at 11:55 AM, Vincenzo Melandri
vmelan...@imolinfo.itwrote:
Hi all :)
I'm here again
Hi all
I have a problem with a data import procedure that involve the following query:
select a,b,c,d
from big_table b
join data_sequences_table ds
on b.key1 = ds.key1 and b.key2 = ds.key2
where ds.import_id=xx
The big table has something like 10.000.000 records ore more
(depending on
1) Make all types the same
2) If you are using some narrow type for big_table (say, int2) to save
space, you can force narrowing conversion, e.g. b.key1=ds.key1::int2. Note
that if ds.key1 has any values that don't fit into int2, you will have
problems. And of course, use your type used
