在PostGIS View中优化查询和连接

Question

我正在开发一个webmapping应用程序，其中我使用PosgreSQL和PostGIS插件作为我的数据库。

我有这两张桌子; CREATE TABLE evidensapp_seniangcbr ( id serial NOT NULL, hazard character varying(16) NOT NULL, geom geometry(MultiPolygon,32651), CONSTRAINT evidensapp_seniangcbr_pkey PRIMARY KEY (id) ); CREATE INDEX evidensapp_seniangcbr_geom_id ON evidensapp_seniangcbr USING gist (geom); CREATE TABLE evidensapp_polystructures ( id serial NOT NULL, bldg_name character varying(100) NOT NULL, bldg_type character varying(50) NOT NULL, brgy_locat character varying(50) NOT NULL, municipali character varying(50) NOT NULL, province character varying(50) NOT NULL, geom geometry(MultiPolygon,32651), CONSTRAINT evidensapp_polystructures_pkey PRIMARY KEY (id) ); CREATE INDEX evidensapp_polystructures_geom_id ON evidensapp_polystructures USING gist (geom); ALTER TABLE evidensapp_polystructures CLUSTER ON evidensapp_polystructures_geom_id; 和structures。两个表都包含几何（多边形）。

seniang

我的查询下面需要将近15分钟。获得与hazard='High'中Medium相交的Low的结果-- Executing query: SELECT count(evidensapp_polystructures.brgy_locat) AS High, evidensapp_polystructures.brgy_locat AS Barangay, evidensapp_polystructures.municipali AS Municipality FROM evidensapp_seniangcbr INNER JOIN evidensapp_polystructures ON ST_Intersects(evidensapp_seniangcbr.geom, evidensapp_polystructures.geom) WHERE evidensapp_seniangcbr.hazard = 'High' GROUP BY evidensapp_polystructures.brgy_locat, evidensapp_polystructures.municipali; Total query runtime: 896688 ms. 23 rows retrieved. 。这同样适用于hazard和CREATE OR REPLACE VIEW high_seninang AS SELECT count(evidensapp_polystructures.brgy_locat) AS high, evidensapp_polystructures.brgy_locat AS barangay, evidensapp_polystructures.municipali AS municipality FROM evidensapp_seniangcbr JOIN evidensapp_polystructures ON ST_Intersects(evidensapp_seniangcbr.geom, evidensapp_polystructures.geom) WHERE evidensapp_seniangcbr.hazard::text = 'High'::text AND evidensapp_seniangcbr.geom && evidensapp_polystructures.geom GROUP BY evidensapp_polystructures.brgy_locat, evidensapp_polystructures.municipali; 。

polystructures

这是不可接受的。那么，我该如何优化呢？我已根据此site完成了空间索引和聚类。

我为每个INFO: analyzing "public.evidensapp_polystructures" INFO: "evidensapp_polystructures": scanned 288 of 288 pages, containing 9847 live rows and 0 dead rows; 9847 rows in sample, 9847 estimated total rows Total query runtime: 122 ms. 创建了一个视图：

seniangcbr

这导致高危险的结果：

如何使用我的视图获得结果：

INFO: analyzing "public.evidensapp_seniangcbr" INFO: "evidensapp_seniangcbr": scanned 1 of 1 pages, containing 6 live rows and 0 dead rows; 6 rows in sample, 6 estimated total rows Total query runtime: 219 ms. ：

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    }
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        if (mDown)
        {
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    }
    private void label13_MouseDown(object sender, MouseEventArgs e)
    {
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    }
    private void label13_MouseUp(object sender, MouseEventArgs e)
    {
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.seperator {
 display: inline-block;
 height: 10px;
 margin-left: 69px;
 margin-right: 206px;
 width: 10px;
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