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 of layout of search_name_* tables
13 The table need a different index for nearest place lookup. Recreate the
14 indexs suing the following shell script:
17 for table in `psql -d nominatim -c "SELECT tablename FROM pg_tables WHERE tablename LIKE 'search_name_%'" -tA | grep -v search_name_blank`;
19 psql -d nominatim -c "DROP INDEX idx_${table}_centroid_place; CREATE INDEX idx_${table}_centroid_place ON ${table} USING gist (centroid) WHERE ((address_rank >= 2) AND (address_rank <= 25)); DROP INDEX idx_${table}_centroid_street; CREATE INDEX idx_${table}_centroid_street ON ${table} USING gist (centroid) WHERE ((address_rank >= 26) AND (address_rank <= 27))";
23 ### Removal of html output
25 The debugging UI is no longer directly provided with Nominatim. Instead we
26 now provide a simple Javascript application. Please refer to
27 [Setting up the Nominatim UI](../Setup-Nominatim-UI) for details on how to
30 The icons served together with the API responses have been moved to the
31 nominatim-ui project as well. If you want to keep the `icon` field in the
32 response, you need to set `CONST_MapIcon_URL` to the URL of the `/mapicon`
33 directory of nominatim-ui.
35 ### Change order during indexing
37 When reindexing places during updates, there is now a different order used
38 which needs a different database index. Create it with the following SQL command:
41 CREATE INDEX idx_placex_pendingsector_rank_address
42 ON placex USING BTREE (rank_address, geometry_sector) where indexed_status > 0;
45 You can then drop the old index with:
48 DROP INDEX idx_placex_pendingsector
53 This index has been unused ever since the query using it was changed two years ago. Saves about 12GB on a planet installation.
56 DROP INDEX idx_placex_geometry_reverse_lookupPoint
59 ### Switching to dotenv
61 As part of the work changing the configuration format, the configuration for
62 the website is now using a separate configuration file. To create the
63 configuration file, run the following command after updating:
66 ./utils/setup.php --setup-website
71 ### New Wikipedia/Wikidata importance tables
73 The `wikipedia_*` tables have a new format that also includes references to
74 Wikidata. You need to update the computation functions and the tables as
77 * download the new Wikipedia tables as described in the import section
78 * reimport the tables: `./utils/setup.php --import-wikipedia-articles`
79 * update the functions: `./utils/setup.php --create-functions --enable-diff-updates`
80 * create a new lookup index:
82 CREATE INDEX idx_placex_wikidata on placex
83 USING BTREE ((extratags -> 'wikidata'))
84 WHERE extratags ? 'wikidata' and class = 'place' and osm_type = 'N' and rank_search < 26
86 * compute importance: `./utils/update.php --recompute-importance`
88 The last step takes about 10 hours on the full planet.
90 Remove one function (it will be recreated in the next step):
93 DROP FUNCTION create_country(hstore,character varying);
96 Finally, update all SQL functions:
99 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
104 ### Reorganisation of location_area_country table
106 The table `location_area_country` has been optimized. You need to switch to the
107 new format when you run updates. While updates are disabled, run the following
111 CREATE TABLE location_area_country_new AS
112 SELECT place_id, country_code, geometry FROM location_area_country;
113 DROP TABLE location_area_country;
114 ALTER TABLE location_area_country_new RENAME TO location_area_country;
115 CREATE INDEX idx_location_area_country_geometry ON location_area_country USING GIST (geometry);
116 CREATE INDEX idx_location_area_country_place_id ON location_area_country USING BTREE (place_id);
119 Finally, update all SQL functions:
122 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
127 ### New database connection string (DSN) format
129 Previously database connection setting (`CONST_Database_DSN` in `settings/*.php`) had the format
131 * (simple) `pgsql://@/nominatim`
132 * (complex) `pgsql://johndoe:secret@machine1.domain.com:1234/db1`
136 * (simple) `pgsql:dbname=nominatim`
137 * (complex) `pgsql:dbname=db1;host=machine1.domain.com;port=1234;user=johndoe;password=secret`
139 ### Natural Earth country boundaries no longer needed as fallback
142 DROP TABLE country_naturalearthdata;
145 Finally, update all SQL functions:
148 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
151 ### Configurable Address Levels
153 The new configurable address levels require a new table. Create it with the
157 ./utils/update.php --update-address-levels
162 ### New reverse algorithm
164 The reverse algorithm has changed and requires new indexes. Run the following
165 SQL statements to create the indexes:
168 CREATE INDEX idx_placex_geometry_reverse_lookupPoint
169 ON placex USING gist (geometry)
170 WHERE (name is not null or housenumber is not null or rank_address between 26 and 27)
171 AND class not in ('railway','tunnel','bridge','man_made')
172 AND rank_address >= 26 AND indexed_status = 0 AND linked_place_id is null;
173 CREATE INDEX idx_placex_geometry_reverse_lookupPolygon
174 ON placex USING gist (geometry)
175 WHERE St_GeometryType(geometry) in ('ST_Polygon', 'ST_MultiPolygon')
176 AND rank_address between 4 and 25 AND type != 'postcode'
177 AND name is not null AND indexed_status = 0 AND linked_place_id is null;
178 CREATE INDEX idx_placex_geometry_reverse_placeNode
179 ON placex USING gist (geometry)
180 WHERE osm_type = 'N' AND rank_search between 5 and 25
181 AND class = 'place' AND type != 'postcode'
182 AND name is not null AND indexed_status = 0 AND linked_place_id is null;
185 You also need to grant the website user access to the `country_osm_grid` table:
188 GRANT SELECT ON table country_osm_grid to "www-user";
191 Replace the `www-user` with the user name of your website server if necessary.
193 You can now drop the unused indexes:
196 DROP INDEX idx_placex_reverse_geometry;
199 Finally, update all SQL functions:
202 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
209 A new separate table for artificially computed postcode centroids was introduced.
210 Migration to the new format is possible but **not recommended**.
212 Create postcode table and indexes, running the following SQL statements:
215 CREATE TABLE location_postcode
216 (place_id BIGINT, parent_place_id BIGINT, rank_search SMALLINT,
217 rank_address SMALLINT, indexed_status SMALLINT, indexed_date TIMESTAMP,
218 country_code varchar(2), postcode TEXT,
219 geometry GEOMETRY(Geometry, 4326));
220 CREATE INDEX idx_postcode_geometry ON location_postcode USING GIST (geometry);
221 CREATE UNIQUE INDEX idx_postcode_id ON location_postcode USING BTREE (place_id);
222 CREATE INDEX idx_postcode_postcode ON location_postcode USING BTREE (postcode);
223 GRANT SELECT ON location_postcode TO "www-data";
224 drop type if exists nearfeaturecentr cascade;
225 create type nearfeaturecentr as (
228 rank_address smallint,
229 rank_search smallint,
237 Add postcode column to `location_area` tables with SQL statement:
240 ALTER TABLE location_area ADD COLUMN postcode TEXT;
243 Then reimport the functions:
246 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
249 Create appropriate triggers with SQL:
252 CREATE TRIGGER location_postcode_before_update BEFORE UPDATE ON location_postcode
253 FOR EACH ROW EXECUTE PROCEDURE postcode_update();
256 Finally populate the postcode table (will take a while):
259 ./utils/setup.php --calculate-postcodes --index --index-noanalyse
262 This will create a working database. You may also delete the old artificial
263 postcodes now. Note that this may be expensive and is not absolutely necessary.
264 The following SQL statement will remove them:
267 DELETE FROM place_addressline a USING placex p
268 WHERE a.address_place_id = p.place_id and p.osm_type = 'P';
269 ALTER TABLE placex DISABLE TRIGGER USER;
270 DELETE FROM placex WHERE osm_type = 'P';
271 ALTER TABLE placex ENABLE TRIGGER USER;