When i make the set enable_seqscan = off the result is:
dbname=# set enable_seqscan = off; SET VARIABLE dbname=# explain analyze SELECT distinct(smsdate) FROM send_total; NOTICE: QUERY PLAN: Unique (cost=0.00..31084.39 rows=1232 width=8) (actual time=108.60..195210.91 rows=6676 loops=1) -> Index Scan using send_total_smsdate_idx on send_total (cost=0.00..31053.60 rows=12315 width=8) (actual time=108.59..195145.43 rows=12087 loops=1) Total runtime: 195226.24 msec On Mon, 2002-06-24 at 19:36, Stephan Szabo wrote: > > On 24 Jun 2002, Marcos Garcia wrote: > > > The problem is that my query is too slow when i use distinct: > > > > pgsql> explain analyze SELECT distinct(smsdate) FROM send_total; > > > > NOTICE: QUERY PLAN: > > > > Unique (cost=15840.31..15870.81 rows=1220 width=8) (actual > > time=56358.93..56452.78 rows=6670 loops=1) > > -> Sort (cost=15840.31..15840.31 rows=12203 width=8) (actual > > time=56358.91..56436.95 rows=12062 loops=1) > > -> Seq Scan on send_total (cost=0.00..15012.03 rows=12203 > > width=8) (actual time=0.55..56205.25 rows=12062 loops=1) > > Total runtime: 56518.26 msec > > As a question, what does explain analyze show if you > set enable_seqscan=off; first? > -- M.P.Garcia PT Inovação, SA Serviços e Redes Móveis Rua José Ferreira Pinto Basto - 3810 Aveiro Tel: 234 403 253 - Fax: 234 424 160 E-mail: [EMAIL PROTECTED]
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