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Oh, thankx. I forgot to put the answer i got from another site. I was told to use box and point type and create an index on it and it works really well !
Rude - Last Territory Ou écouter ? Ou acheter ? La Fnac iTunes > Date: Sun, 7 Oct 2012 17:27:02 +0300 > Subject: Re: Same query doing slow then quick > From: ants@xxxxxxxxxxx > To: ffw_rude@xxxxxxxxxxx > CC: lystor@xxxxxxxxx; pgsql-performance@xxxxxxxxxxxxxx > > Sorry for the late answer, I was going through my e-mail backlog and > noticed that this question hadn't been answered. > > On Thu, Sep 27, 2012 at 11:33 AM, Undertaker Rude <ffw_rude@xxxxxxxxxxx> wrote: > > Oh ok. But what is this command doing ? i'm gonna runn it today. I'll keep > > you posted. Here is some EXPLAIN ANALYZE from the querys : > > > > > > Nested Loop (cost=0.00..353722.89 rows=124893 width=16) (actual > > time=261158.061..10304193.501 rows=99 loops=1) > > Join Filter: ((t2."X" >= (t1.x_min)::double precision) AND (t2."X" <= > > (t1.x_max)::double precision) AND (t2."Y" >= (t1.y_min)::double precision) > > AND (t2."Y" <= (t1.y_max)::double precision)) > > -> Seq Scan on gps_22 t1 (cost=0.00..3431.80 rows=177480 width=44) > > (actual time=0.036..1399.621 rows=177480 loops=1) > > -> Materialize (cost=0.00..20572.83 rows=57 width=20) (actual > > time=0.012..10.274 rows=2924 loops=177480) > > -> Seq Scan on adresses_22 t2 (cost=0.00..20572.55 rows=57 > > width=20) (actual time=1570.240..1726.376 rows=2924 loops=1) > > Filter: ((id_maille_200m)::text = '0'::text) > > Total runtime: 10304211.648 ms > > As you can see from the explain plan, postgresql is not using any > indexes here. The reason is the type mismatch between the X and x_min > columns. Use matching types between tables to enable index use. The > same goes for the id column, if the column type is integer use a > numeric literal 0 not a text literal '0'. > > Regards, > Ants Aasma > -- > Cybertec Schönig & Schönig GmbH > Gröhrmühlgasse 26 > A-2700 Wiener Neustadt > Web: http://www.postgresql-support.de |
