Re: How to optimize this query?

Hello Markus,

Wednesday, March 22, 2006, 6:58:44 PM, you wrote:

MB> Send an EXPLAIN ANALYZE of the query along with the description of the
MB> involved tables. Also hardware information (RAM, disks, CPU), what
MB> other applications are running on that box and the parameter values in
MB> postgresql.conf that you changed from the defaults would be
MB> interesting.

Sort (cost=21413847.71..21413867.37 rows=7864 width=107)
Sort Key: dostawcy.id_dostawcy
-> Group (cost=1360.03..21413073.50 rows=7864 width=107)
-> Sort (cost=1360.03..1379.69 rows=7864 width=107)
Sort Key: towar.id_towar, towar.key2, towar.nazwa, towar.min1, towar.max1, towar.ilosc_jed, towar.ilosc_nom, dostawcy.id_dostawcy, jednostka_miary.jednostka, towar.ilosc_paczkowa, towar.key1
-> Hash Left Join (cost=2.21..585.81 rows=7864 width=107)
Hash Cond: ("outer".id_jednostka_miary = "inner".id_jednostka_miary)
-> Hash Left Join (cost=1.14..466.78 rows=7864 width=103)
Hash Cond: ("outer".id_dostawcy = "inner".id_dostawcy)
-> Seq Scan on towar (cost=0.00..347.68 rows=7864 width=103)
Filter: policzalne
-> Hash (cost=1.11..1.11 rows=11 width=4)
-> Seq Scan on dostawcy (cost=0.00..1.11 rows=11 width=4)
-> Hash (cost=1.06..1.06 rows=6 width=12)
-> Seq Scan on jednostka_miary (cost=0.00..1.06 rows=6 width=12)
SubPlan
-> Aggregate (cost=2722.71..2722.72 rows=1 width=14)
-> Nested Loop (cost=64.33..2722.28 rows=171 width=14)
-> Hash Join (cost=64.33..602.79 rows=368 width=12)
Hash Cond: ("outer".id_zlecenia = "inner".id_zlecenia)
-> Seq Scan on zlecenia_elementy (cost=0.00..488.85 rows=9185 width=20)
-> Hash (cost=63.98..63.98 rows=140 width=8)
-> Bitmap Heap Scan on zlecenia (cost=6.50..63.98 rows=140 width=8)
Recheck Cond: ((id_paczka = 52) OR (id_paczka = 50) OR (id_paczka = 53))
-> BitmapOr (cost=6.50..6.50 rows=142 width=0)
-> Bitmap Index Scan on zlecenia_id_paczka (cost=0.00..2.17 rows=47 width=0)
Index Cond: (id_paczka = 52)
-> Bitmap Index Scan on zlecenia_id_paczka (cost=0.00..2.17 rows=47 width=0)
Index Cond: (id_paczka = 50)
-> Bitmap Index Scan on zlecenia_id_paczka (cost=0.00..2.17 rows=47 width=0)
Index Cond: (id_paczka = 53)
-> Index Scan using zlezenia_towar_elementy_towar on zlecenia_towar (cost=0.00..5.75 rows=1 width=18)
Index Cond: ((zlecenia_towar.id_zlecenia_elementy = "outer".id_zlecenia_elementy) AND (zlecenia_towar.id_towar = $0))
(33 rows)

--
Best regards,
Maciej mailto:piechcio(at)isb(dot)com(dot)pl