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
29 This index has been unused ever since the query using it was changed two years ago. Saves about 12GB on a planet installation.
32 DROP INDEX idx_placex_geometry_reverse_lookupPoint
35 ### Switching to dotenv
37 As part of the work changing the configuration format, the configuration for
38 the website is now using a separate configuration file. To create the
39 configuration file, run the following command after updating:
42 ./utils/setup.php --setup-website
47 ### New Wikipedia/Wikidata importance tables
49 The `wikipedia_*` tables have a new format that also includes references to
50 Wikidata. You need to update the computation functions and the tables as
53 * download the new Wikipedia tables as described in the import section
54 * reimport the tables: `./utils/setup.php --import-wikipedia-articles`
55 * update the functions: `./utils/setup.php --create-functions --enable-diff-updates`
56 * create a new lookup index:
58 CREATE INDEX idx_placex_wikidata on placex
59 USING BTREE ((extratags -> 'wikidata'))
60 WHERE extratags ? 'wikidata' and class = 'place' and osm_type = 'N' and rank_search < 26
62 * compute importance: `./utils/update.php --recompute-importance`
64 The last step takes about 10 hours on the full planet.
66 Remove one function (it will be recreated in the next step):
69 DROP FUNCTION create_country(hstore,character varying);
72 Finally, update all SQL functions:
75 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
80 ### Reorganisation of location_area_country table
82 The table `location_area_country` has been optimized. You need to switch to the
83 new format when you run updates. While updates are disabled, run the following
87 CREATE TABLE location_area_country_new AS
88 SELECT place_id, country_code, geometry FROM location_area_country;
89 DROP TABLE location_area_country;
90 ALTER TABLE location_area_country_new RENAME TO location_area_country;
91 CREATE INDEX idx_location_area_country_geometry ON location_area_country USING GIST (geometry);
92 CREATE INDEX idx_location_area_country_place_id ON location_area_country USING BTREE (place_id);
95 Finally, update all SQL functions:
98 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
103 ### New database connection string (DSN) format
105 Previously database connection setting (`CONST_Database_DSN` in `settings/*.php`) had the format
107 * (simple) `pgsql://@/nominatim`
108 * (complex) `pgsql://johndoe:secret@machine1.domain.com:1234/db1`
112 * (simple) `pgsql:dbname=nominatim`
113 * (complex) `pgsql:dbname=db1;host=machine1.domain.com;port=1234;user=johndoe;password=secret`
115 ### Natural Earth country boundaries no longer needed as fallback
118 DROP TABLE country_naturalearthdata;
121 Finally, update all SQL functions:
124 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
127 ### Configurable Address Levels
129 The new configurable address levels require a new table. Create it with the
133 ./utils/update.php --update-address-levels
138 ### New reverse algorithm
140 The reverse algorithm has changed and requires new indexes. Run the following
141 SQL statements to create the indexes:
144 CREATE INDEX idx_placex_geometry_reverse_lookupPoint
145 ON placex USING gist (geometry)
146 WHERE (name is not null or housenumber is not null or rank_address between 26 and 27)
147 AND class not in ('railway','tunnel','bridge','man_made')
148 AND rank_address >= 26 AND indexed_status = 0 AND linked_place_id is null;
149 CREATE INDEX idx_placex_geometry_reverse_lookupPolygon
150 ON placex USING gist (geometry)
151 WHERE St_GeometryType(geometry) in ('ST_Polygon', 'ST_MultiPolygon')
152 AND rank_address between 4 and 25 AND type != 'postcode'
153 AND name is not null AND indexed_status = 0 AND linked_place_id is null;
154 CREATE INDEX idx_placex_geometry_reverse_placeNode
155 ON placex USING gist (geometry)
156 WHERE osm_type = 'N' AND rank_search between 5 and 25
157 AND class = 'place' AND type != 'postcode'
158 AND name is not null AND indexed_status = 0 AND linked_place_id is null;
161 You also need to grant the website user access to the `country_osm_grid` table:
164 GRANT SELECT ON table country_osm_grid to "www-user";
167 Replace the `www-user` with the user name of your website server if necessary.
169 You can now drop the unused indexes:
172 DROP INDEX idx_placex_reverse_geometry;
175 Finally, update all SQL functions:
178 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
185 A new separate table for artificially computed postcode centroids was introduced.
186 Migration to the new format is possible but **not recommended**.
188 Create postcode table and indexes, running the following SQL statements:
191 CREATE TABLE location_postcode
192 (place_id BIGINT, parent_place_id BIGINT, rank_search SMALLINT,
193 rank_address SMALLINT, indexed_status SMALLINT, indexed_date TIMESTAMP,
194 country_code varchar(2), postcode TEXT,
195 geometry GEOMETRY(Geometry, 4326));
196 CREATE INDEX idx_postcode_geometry ON location_postcode USING GIST (geometry);
197 CREATE UNIQUE INDEX idx_postcode_id ON location_postcode USING BTREE (place_id);
198 CREATE INDEX idx_postcode_postcode ON location_postcode USING BTREE (postcode);
199 GRANT SELECT ON location_postcode TO "www-data";
200 drop type if exists nearfeaturecentr cascade;
201 create type nearfeaturecentr as (
204 rank_address smallint,
205 rank_search smallint,
213 Add postcode column to `location_area` tables with SQL statement:
216 ALTER TABLE location_area ADD COLUMN postcode TEXT;
219 Then reimport the functions:
222 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
225 Create appropriate triggers with SQL:
228 CREATE TRIGGER location_postcode_before_update BEFORE UPDATE ON location_postcode
229 FOR EACH ROW EXECUTE PROCEDURE postcode_update();
232 Finally populate the postcode table (will take a while):
235 ./utils/setup.php --calculate-postcodes --index --index-noanalyse
238 This will create a working database. You may also delete the old artificial
239 postcodes now. Note that this may be expensive and is not absolutely necessary.
240 The following SQL statement will remove them:
243 DELETE FROM place_addressline a USING placex p
244 WHERE a.address_place_id = p.place_id and p.osm_type = 'P';
245 ALTER TABLE placex DISABLE TRIGGER USER;
246 DELETE FROM placex WHERE osm_type = 'P';
247 ALTER TABLE placex ENABLE TRIGGER USER;