3 This page describes database migrations necessary to update existing databases
4 to newer versions of Nominatim.
6 SQL statements should be executed from the PostgreSQL commandline. Execute
7 `psql nominatim` to enter command line mode.
11 ### Change order during indexing
13 When reindexing places during updates, there is now a different order used
14 which needs a different database index. Create it with the following SQL command:
17 CREATE INDEX idx_placex_pendingsector_rank_address
18 ON placex USING BTREE (rank_address, geometry_sector) where indexed_status > 0;
21 You can then drop the old index with:
24 DROP INDEX idx_placex_pendingsector
28 ### Switching to dotenv
30 As part of the work changing the configuration format, the configuration for
31 the website is now using a separate configuration file. To create the
32 configuration file, run the following command after updating:
35 ./utils/setup.php --setup-website
40 ### New Wikipedia/Wikidata importance tables
42 The `wikipedia_*` tables have a new format that also includes references to
43 Wikidata. You need to update the computation functions and the tables as
46 * download the new Wikipedia tables as described in the import section
47 * reimport the tables: `./utils/setup.php --import-wikipedia-articles`
48 * update the functions: `./utils/setup.php --create-functions --enable-diff-updates`
49 * compute importance: `./utils/update.php --recompute-importance`
51 The last step takes about 10 hours on the full planet.
53 Remove one function (it will be recreated in the next step):
56 DROP FUNCTION create_country(hstore,character varying);
59 Finally, update all SQL functions:
62 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
67 ### Reorganisation of location_area_country table
69 The table `location_area_country` has been optimized. You need to switch to the
70 new format when you run updates. While updates are disabled, run the following
74 CREATE TABLE location_area_country_new AS
75 SELECT place_id, country_code, geometry FROM location_area_country;
76 DROP TABLE location_area_country;
77 ALTER TABLE location_area_country_new RENAME TO location_area_country;
78 CREATE INDEX idx_location_area_country_geometry ON location_area_country USING GIST (geometry);
79 CREATE INDEX idx_location_area_country_place_id ON location_area_country USING BTREE (place_id);
82 Finally, update all SQL functions:
85 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
90 ### New database connection string (DSN) format
92 Previously database connection setting (`CONST_Database_DSN` in `settings/*.php`) had the format
94 * (simple) `pgsql://@/nominatim`
95 * (complex) `pgsql://johndoe:secret@machine1.domain.com:1234/db1`
99 * (simple) `pgsql:dbname=nominatim`
100 * (complex) `pgsql:dbname=db1;host=machine1.domain.com;port=1234;user=johndoe;password=secret`
102 ### Natural Earth country boundaries no longer needed as fallback
105 DROP TABLE country_naturalearthdata;
108 Finally, update all SQL functions:
111 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
114 ### Configurable Address Levels
116 The new configurable address levels require a new table. Create it with the
120 ./utils/update.php --update-address-levels
125 ### New reverse algorithm
127 The reverse algorithm has changed and requires new indexes. Run the following
128 SQL statements to create the indexes:
131 CREATE INDEX idx_placex_geometry_reverse_lookupPoint
132 ON placex USING gist (geometry)
133 WHERE (name is not null or housenumber is not null or rank_address between 26 and 27)
134 AND class not in ('railway','tunnel','bridge','man_made')
135 AND rank_address >= 26 AND indexed_status = 0 AND linked_place_id is null;
136 CREATE INDEX idx_placex_geometry_reverse_lookupPolygon
137 ON placex USING gist (geometry)
138 WHERE St_GeometryType(geometry) in ('ST_Polygon', 'ST_MultiPolygon')
139 AND rank_address between 4 and 25 AND type != 'postcode'
140 AND name is not null AND indexed_status = 0 AND linked_place_id is null;
141 CREATE INDEX idx_placex_geometry_reverse_placeNode
142 ON placex USING gist (geometry)
143 WHERE osm_type = 'N' AND rank_search between 5 and 25
144 AND class = 'place' AND type != 'postcode'
145 AND name is not null AND indexed_status = 0 AND linked_place_id is null;
148 You also need to grant the website user access to the `country_osm_grid` table:
151 GRANT SELECT ON table country_osm_grid to "www-user";
154 Replace the `www-user` with the user name of your website server if necessary.
156 You can now drop the unused indexes:
159 DROP INDEX idx_placex_reverse_geometry;
162 Finally, update all SQL functions:
165 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
172 A new separate table for artificially computed postcode centroids was introduced.
173 Migration to the new format is possible but **not recommended**.
175 Create postcode table and indexes, running the following SQL statements:
178 CREATE TABLE location_postcode
179 (place_id BIGINT, parent_place_id BIGINT, rank_search SMALLINT,
180 rank_address SMALLINT, indexed_status SMALLINT, indexed_date TIMESTAMP,
181 country_code varchar(2), postcode TEXT,
182 geometry GEOMETRY(Geometry, 4326));
183 CREATE INDEX idx_postcode_geometry ON location_postcode USING GIST (geometry);
184 CREATE UNIQUE INDEX idx_postcode_id ON location_postcode USING BTREE (place_id);
185 CREATE INDEX idx_postcode_postcode ON location_postcode USING BTREE (postcode);
186 GRANT SELECT ON location_postcode TO "www-data";
187 drop type if exists nearfeaturecentr cascade;
188 create type nearfeaturecentr as (
191 rank_address smallint,
192 rank_search smallint,
200 Add postcode column to `location_area` tables with SQL statement:
203 ALTER TABLE location_area ADD COLUMN postcode TEXT;
206 Then reimport the functions:
209 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
212 Create appropriate triggers with SQL:
215 CREATE TRIGGER location_postcode_before_update BEFORE UPDATE ON location_postcode
216 FOR EACH ROW EXECUTE PROCEDURE postcode_update();
219 Finally populate the postcode table (will take a while):
222 ./utils/setup.php --calculate-postcodes --index --index-noanalyse
225 This will create a working database. You may also delete the old artificial
226 postcodes now. Note that this may be expensive and is not absolutely necessary.
227 The following SQL statement will remove them:
230 DELETE FROM place_addressline a USING placex p
231 WHERE a.address_place_id = p.place_id and p.osm_type = 'P';
232 ALTER TABLE placex DISABLE TRIGGER USER;
233 DELETE FROM placex WHERE osm_type = 'P';
234 ALTER TABLE placex ENABLE TRIGGER USER;