重庆分公司,新征程启航
为企业提供网站建设、域名注册、服务器等服务
一、表结构定义
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-- Table: public.tbl_buildings
-- DROP TABLE public.tbl_buildings;
CREATE TABLE public.tbl_buildings
(
id character(7) NOT NULL,
name character(20),
type character(10),
address character(30),
the_geom geometry,
CONSTRAINT tbl_buildings_pkey PRIMARY KEY (id)
)
列变更
SELECT DropGeometryColumn('tbl_properties', 'the_geom')
SELECT AddGeometryColumn('tbl_properties', 'the_geom', 4326,
'POINT', 2);
添加数据
INSERT INTO tbl_properties ( id, town, postal_code, street,
"number", the_geom)VALUES (1, 'London', 'N7 6PA', 'Holloway Road',
32, ST_GeomFromEWKT('SRID=4326;POINT(51.556173 -0.116190)'));
二、geometry列建立gist索引
CREATE INDEX idx_geo_buildings ON tbl_buildings USING GIST ( the_geom );
三、数据库参数
1.checkpoint_segments(9.5 ago)
Default value:3
Suggested value:6
-----------------------------------
max_wal_size(after 9.5)
Default value:1 GB
2.constraint_exclusion
Default value:Deactivated
Suggested value:Activated, partition
3.maintenance_work_mem
Default value:16
Suggested value:128
4.random_page_cost
Default value 4.0
Suggested value 2.0
5.shared_buffers
Default value :32 MB
Suggested value: 64 MB to 512 MB unlikely for an allocation of more than 40 percent
of RAM(windows),25% physical memory(Linux)
6.wal_buffers
Default value:64kb
Suggested value:1MB
7.work_mem
Default value:1MB
Suggested value:16MB
以上均为建议值,具体需要根据系统运行情况修改。