170 lines
5.1 KiB
PL/PgSQL
170 lines
5.1 KiB
PL/PgSQL
-- Database creation script for the snapshot PostgreSQL schema.
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-- Drop all tables if they exist.
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DROP TABLE IF EXISTS actions;
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DROP TABLE IF EXISTS users;
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DROP TABLE IF EXISTS nodes;
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DROP TABLE IF EXISTS ways;
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DROP TABLE IF EXISTS way_nodes;
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DROP TABLE IF EXISTS relations;
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DROP TABLE IF EXISTS relation_members;
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DROP TABLE IF EXISTS schema_info;
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-- Drop all stored procedures if they exist.
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DROP FUNCTION IF EXISTS osmosisUpdate();
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-- Create a table which will contain a single row defining the current schema version.
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CREATE TABLE schema_info (
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version integer NOT NULL
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);
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-- Create a table for users.
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CREATE TABLE users (
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id int NOT NULL,
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name text NOT NULL
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);
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-- Create a table for nodes.
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CREATE TABLE nodes (
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id bigint NOT NULL,
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version int NOT NULL,
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user_id int NOT NULL,
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tstamp timestamp without time zone NOT NULL,
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changeset_id bigint NOT NULL,
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tags hstore
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);
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-- Add a postgis point column holding the location of the node.
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SELECT AddGeometryColumn('nodes', 'geom', 4326, 'POINT', 2);
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-- Create a table for ways.
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CREATE TABLE ways (
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id bigint NOT NULL,
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version int NOT NULL,
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user_id int NOT NULL,
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tstamp timestamp without time zone NOT NULL,
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changeset_id bigint NOT NULL,
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tags hstore,
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nodes bigint[]
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);
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-- Create a table for representing way to node relationships.
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CREATE TABLE way_nodes (
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way_id bigint NOT NULL,
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node_id bigint NOT NULL,
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sequence_id int NOT NULL
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);
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-- Create a table for relations.
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CREATE TABLE relations (
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id bigint NOT NULL,
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version int NOT NULL,
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user_id int NOT NULL,
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tstamp timestamp without time zone NOT NULL,
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changeset_id bigint NOT NULL,
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tags hstore
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);
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-- Create a table for representing relation member relationships.
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CREATE TABLE relation_members (
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relation_id bigint NOT NULL,
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member_id bigint NOT NULL,
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member_type character(1) NOT NULL,
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member_role text NOT NULL,
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sequence_id int NOT NULL
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);
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-- Configure the schema version.
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INSERT INTO schema_info (version) VALUES (6);
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-- Add primary keys to tables.
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ALTER TABLE ONLY schema_info ADD CONSTRAINT pk_schema_info PRIMARY KEY (version);
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ALTER TABLE ONLY users ADD CONSTRAINT pk_users PRIMARY KEY (id);
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ALTER TABLE ONLY nodes ADD CONSTRAINT pk_nodes PRIMARY KEY (id);
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ALTER TABLE ONLY ways ADD CONSTRAINT pk_ways PRIMARY KEY (id);
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ALTER TABLE ONLY way_nodes ADD CONSTRAINT pk_way_nodes PRIMARY KEY (way_id, sequence_id);
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ALTER TABLE ONLY relations ADD CONSTRAINT pk_relations PRIMARY KEY (id);
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ALTER TABLE ONLY relation_members ADD CONSTRAINT pk_relation_members PRIMARY KEY (relation_id, sequence_id);
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-- Add indexes to tables.
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CREATE INDEX idx_nodes_geom ON nodes USING gist (geom);
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CREATE INDEX idx_way_nodes_node_id ON way_nodes USING btree (node_id);
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CREATE INDEX idx_relation_members_member_id_and_type ON relation_members USING btree (member_id, member_type);
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-- Set to cluster nodes by geographical location.
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ALTER TABLE ONLY nodes CLUSTER ON idx_nodes_geom;
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-- Set to cluster the tables showing relationship by parent ID and sequence
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ALTER TABLE ONLY way_nodes CLUSTER ON pk_way_nodes;
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ALTER TABLE ONLY relation_members CLUSTER ON pk_relation_members;
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-- There are no sensible CLUSTER orders for users or relations.
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-- Depending on geometry columns different clustings of ways may be desired.
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-- Create the function that provides "unnest" functionality while remaining compatible with 8.3.
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CREATE OR REPLACE FUNCTION unnest_bbox_way_nodes() RETURNS void AS $$
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DECLARE
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previousId ways.id%TYPE;
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currentId ways.id%TYPE;
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result bigint[];
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wayNodeRow way_nodes%ROWTYPE;
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wayNodes ways.nodes%TYPE;
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BEGIN
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FOR wayNodes IN SELECT bw.nodes FROM bbox_ways bw LOOP
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FOR i IN 1 .. array_upper(wayNodes, 1) LOOP
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INSERT INTO bbox_way_nodes (id) VALUES (wayNodes[i]);
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END LOOP;
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END LOOP;
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END;
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$$ LANGUAGE plpgsql;
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-- Create customisable hook function that is called within the replication update transaction.
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CREATE FUNCTION osmosisUpdate() RETURNS void AS $$
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DECLARE
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BEGIN
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END;
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$$ LANGUAGE plpgsql;
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-- Manually set statistics for the way_nodes and relation_members table
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-- Postgres gets horrible counts of distinct values by sampling random pages
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-- and can be off by an 1-2 orders of magnitude
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-- Size of the ways table / size of the way_nodes table
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ALTER TABLE way_nodes ALTER COLUMN way_id SET (n_distinct = -0.08);
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-- Size of the nodes table / size of the way_nodes table * 0.998
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-- 0.998 is a factor for nodes not in ways
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ALTER TABLE way_nodes ALTER COLUMN node_id SET (n_distinct = -0.83);
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-- API allows a maximum of 2000 nodes/way. Unlikely to impact query plans.
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ALTER TABLE way_nodes ALTER COLUMN sequence_id SET (n_distinct = 2000);
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-- Size of the relations table / size of the relation_members table
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ALTER TABLE relation_members ALTER COLUMN relation_id SET (n_distinct = -0.09);
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-- Based on June 2013 data
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ALTER TABLE relation_members ALTER COLUMN member_id SET (n_distinct = -0.62);
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-- Based on June 2013 data. Unlikely to impact query plans.
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ALTER TABLE relation_members ALTER COLUMN member_role SET (n_distinct = 6500);
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-- Based on June 2013 data. Unlikely to impact query plans.
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ALTER TABLE relation_members ALTER COLUMN sequence_id SET (n_distinct = 10000);
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