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<p class=MsoNormal><span lang=EN-US>Hi all (with a special wink to Regina ;- )<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>This is the query not using indices:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>SELECT parish,county,geometry FROM
pt_madeira_toponymy as t WHERE parish=upper('se') AND<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> t.geometry &&
geomfromtext('POINT(-16.9213592631455 32.6437878212273)',4326) AND
intersects(geomfromtext('POINT(-16.9213592631455 32.6437878212273)',4326),
t.geometry);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>As you can plainly see it checks if a point
is inside some polygon.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>EXPLAIN ANALYZE returns this:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>"Seq Scan on pt_madeira_toponymy
t (cost=0.00..3.03 rows=1 width=96) (actual time=1.086..1.278 rows=1
loops=1)"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>" Filter: ((parish = 'SE'::text)
AND (geometry && '0101000020E61000009B135F33DEEB30C0FFDDAAA367524040'::geometry)
AND intersects('0101000020E61000009B135F33DEEB30C0FFDDAAA367524040'::geometry,
geometry))"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>"Total runtime: 1.312 ms"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The toponymy has two indices: one for 4326
and another for 32628 using GiST.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Is the intersects function not using
indices at all??<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Already thankful for any ideas,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>With best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Pedro Doria Meunier.<o:p></o:p></span></p>
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