WITH: select * from partes where cedula not in (select cedula from sujetos) Seq Scan on partes (cost=0.00..168063925339.69 rows=953831 width=109) Filter: (NOT (subplan)) SubPlan -> Seq Scan on sujetos (cost=0.00..162348.43 rows=5540143 width=15)
WITH: select * from partes where not exists (select cedula from sujetos where cedula=partes.cedula)
Seq Scan on partes (cost=0.00..7373076.94 rows=953831 width=109)
Filter: (NOT (subplan))
SubPlan
-> Index Scan using sujetos_pkey on sujetos (cost=0.00..3.84 rows=1 width=15)
Index Cond: ((cedula)::text = ($0)::text)
Thomas F. O'Connell wrote:
Please post the results of that query as run through EXPLAIN ANALYZE.
Also, I'm going to reply to this on pgsql-performance, which is probably where it better belongs.
-tfo
-- Thomas F. O'Connell Co-Founder, Information Architect Sitening, LLC http://www.sitening.com/ 110 30th Avenue North, Suite 6 Nashville, TN 37203-6320 615-260-0005
On Mar 22, 2005, at 8:23 AM, Sabio - PSQL wrote:
How can I improve speed on my queries. For example this query takes one day executing itself and it has not finalized !!!
"create table tmp_partes as select * from partes where identificacion not in (select cedula from sujetos)"
partes have 1888000 rows, an index on identificacion sujetos have 5500000 rows, an index on cedula
---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
