This is a discussion on zero performance on query within the Pgsql Performance forums, part of the PostgreSQL category; --> what happend with postgresql 8.1b4 performance on query? please help me !!! look at this: select count(*) from fotos ...
| |||||||
| Register | FAQ | Members List | Calendar | Search | Today's Posts | Mark Forums Read |
| ||||
| what happend with postgresql 8.1b4 performance on query? please help me !!! look at this: select count(*) from fotos where archivo not in (select archivo from archivos) Aggregate (cost=4899037992.36..4899037992.37 rows=1 width=0) -> Seq Scan on fotos (cost=22598.78..4899037338.07 rows=261716 width=0) Filter: (NOT (subplan)) SubPlan -> Materialize (cost=22598.78..39304.22 rows=805344 width=58) -> Seq Scan on archivos (cost=0.00..13141.44 rows=805344 width=58) I WILL DIE WAITING FOR QUERY RESPONSE !!! -- CREATE TABLE archivos ( archivo varchar(20)) WITHOUT OIDS; CREATE INDEX archivos_archivo_idx ON archivos USING btree(archivo); ~800000 rows -- CREATE TABLE fotos ( cedula varchar(20), nombre varchar(100), apellido1 varchar(100), apellido2 varchar(100), archivo varchar(20) ) WITHOUT OIDS; CREATE INDEX fotos_archivo_idx ON fotos USING btree (archivo); CREATE INDEX fotos_cedula_idx ON fotos USING btree (cedula); ~500000 rows __________________________________________________ _______________ Consigue aquí las mejores y mas recientes ofertas de trabajo en América Latina y USA: http://latam.msn.com/empleos/ ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster |
| ||||
| On Tue, Oct 25, 2005 at 10:26:43PM -0600, Sidar López Cruz wrote: > look at this: > select count(*) from fotos where archivo not in (select archivo from > archivos) > Aggregate (cost=4899037992.36..4899037992.37 rows=1 width=0) > -> Seq Scan on fotos (cost=22598.78..4899037338.07 rows=261716 width=0) > Filter: (NOT (subplan)) > SubPlan > -> Materialize (cost=22598.78..39304.22 rows=805344 width=58) > -> Seq Scan on archivos (cost=0.00..13141.44 rows=805344 > width=58) Now, this is interesting; it seems to trigger exactly the same oddity as my query did (at least one of them; the materialized sequential scan). /* Steinar */ -- Homepage: http://www.sesse.net/ ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to majordomo@postgresql.org so that your message can get through to the mailing list cleanly |