[postgis-users] Very long query time

[Manchon Pierre]

Hello,

The indexes are code_zoneinteret and code_tuile on recouvrement







De : postgis-users <postgis-users-bounces at lists.osgeo.org> De la part de 
Darafei "Kom?pa" Praliaskouski
Envoyé : jeudi 6 décembre 2018 17:18
À : PostGIS Users Discussion <postgis-users at lists.osgeo.org>
Objet : Re: [postgis-users] Very long query time



Hello,



What are the indexes on the table?



On Thu, Dec 6, 2018 at 7:16 PM Manchon Pierre < 
<mailto:pierre.manchon at irstea.fr> pierre.manchon at irstea.fr> wrote:

Yes the request took about ~100ms to be executed before but now it never 
ends (I left it 1h)

(thx for the tip with where clause)



De : postgis-users < <mailto:postgis-users-bounces at lists.osgeo.org> 
postgis-users-bounces at lists.osgeo.org> De la part de Tumasgiu Rossini
Envoyé : jeudi 6 décembre 2018 17:09
À : PostGIS Users Discussion < <mailto:postgis-users at lists.osgeo.org> 
postgis-users at lists.osgeo.org>
Objet : Re: [postgis-users] Very long query time



I do not really understand.

Is it a query which used to be faster ?



A little remark on your where clause :

it is unnecesseraly complicated and could be shortened to :

    WHERE st_intersects(zi.geom, tile.geom)



True and false value doesn't need to be surronded by quote,

here you are implicitly casting the string value 'true' to its boolean 
representation





Le jeu. 6 déc. 2018 à 16:53, Manchon Pierre <pierre.manchon at irstea.fr 
<mailto:pierre.manchon at irstea.fr> > a écrit :

Hello there,

I'm new on the list and for a premiere I would like to know if some of you 
have a very long runtime for some of their queries (even with a LIMIT 5), 
whereas those queries were working well before (nothing changed from that). 
I'm using Postgre10, pgAdmin4 and postgis 2.4.4 on windows …



The infinite query I’m trying to execute: (only ~500 rows are stored on each 
of the two tables)




SELECT code_tile, code_zi FROM data.tile, data.zi

WHERE ST_Intersects(zi.geom, tile.geom) = 'true'

GROUP BY code_zi, code_tile, zi.geom, tile.geom

LIMIT 5



Thank you for your time

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Darafei Praliaskouski

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