# Database Migrations
-This page describes database migrations necessary to update existing databases
-to newer versions of Nominatim.
+Nominatim offers automatic migrations for versions 4.3+. Please follow
+the following steps:
-SQL statements should be executed from the PostgreSQL commandline. Execute
-`psql nominatim` to enter command line mode.
+* Stop any updates that are potentially running
+* Update the backend: `pip install -U nominatim-db`
+* Go to your project directory and run `nominatim admin --migrate`
+* Update the frontend: `pip install -U nominatim-api`
+* (optionally) Restart updates
-## 3.4.0 -> master
+If you are still using CMake for the installation of Nominatim, then you
+need to update the software in one step before migrating the database.
+It is not recommended to do this while the machine is serving requests.
+
+Below you find additional migrations and hints about other structural and
+breaking changes. **Please read them before running the migration.**
+
+!!! note
+ If you are migrating from a version <4.3, you need to install 4.3
+ first and migrate to 4.3 first. Then you can migrate to the current
+ version. It is strongly recommended to do a reimport instead.
+
+## 4.5.0 -> master
+
+### PHP frontend removed
+
+The PHP frontend has been completely removed. Please switch to the Python
+frontend.
+
+Without the PHP code, the `nominatim refresh --website` command is no longer
+needed. It currently omits a warning and does otherwise nothing. It will be
+removed in later versions of Nominatim. So make sure you remove it from your
+scripts.
+
+## 4.4.0 -> 4.5.0
+
+### New structure for Python packages
+
+The nominatim Python package has been split into `nominatim-db` and `nominatim-api`.
+Any imports need to be adapted accordingly.
+
+If you are running the Python frontend, change the server module from
+`nominatim.server.falcon.server` to `nominatim_api.server.falcon.server`.
+
+If you are using the Nominatim library, all imports need to be changed
+from `nominatim.api.<module>` to `nominatim_api.<module>`.
+
+If you have written custom tokenizers or sanitizers, the appropriate modules
+are now found in `nominatim_db`.
+
+## 4.2.0 -> 4.3.0
+
+### New indexes for reverse lookup
+
+The reverse lookup algorithm has changed slightly to improve performance.
+This change needs a different index in the database. The required index
+will be automatically build during migration. Until the new index is available
+performance of the /reverse endpoint is significantly reduced. You should
+therefore either remove traffic from the machine before attempting a
+version update or create the index manually **before** starting the update
+using the following SQL:
+
+```sql
+CREATE INDEX IF NOT EXISTS idx_placex_geometry_reverse_lookupPlaceNode
+ ON placex USING gist (ST_Buffer(geometry, reverse_place_diameter(rank_search)))
+ WHERE rank_address between 4 and 25 AND type != 'postcode'
+ AND name is not null AND linked_place_id is null AND osm_type = 'N';
+```
+
+## 4.0.0 -> 4.1.0
+
+### ICU tokenizer is the new default
+
+Nominatim now installs the [ICU tokenizer](../customize/Tokenizers.md#icu-tokenizer)
+by default. This only has an effect on newly installed databases. When
+updating older databases, it keeps its installed tokenizer. If you still
+run with the legacy tokenizer, make sure to compile Nominatim with the
+PostgreSQL module, see [Installation](Installation.md#building-nominatim).
+
+### geocodejson output changed
+
+The `type` field of the geocodejson output has changed. It now contains
+the address class of the object instead of the value of the OSM tag. If
+your client has used the `type` field, switch them to read `osm_value`
+instead.
+
+## 3.7.0 -> 4.0.0
+
+### NOMINATIM_PHRASE_CONFIG removed
+
+Custom blacklist configurations for special phrases now need to be handed
+with the `--config` parameter to `nominatim special-phrases`. Alternatively
+you can put your custom configuration in the project directory in a file
+named `phrase-settings.json`.
+
+Version 3.8 also removes the automatic converter for the php format of
+the configuration in older versions. If you are updating from Nominatim < 3.7
+and still work with a custom `phrase-settings.php`, you need to manually
+convert it into a json format.
+
+### PHP utils removed
+
+The old PHP utils have now been removed completely. You need to switch to
+the appropriate functions of the nominatim command line tool. See
+[Introducing `nominatim` command line tool](#introducing-nominatim-command-line-tool)
+below.
+
+## 3.6.0 -> 3.7.0
+
+### New format and name of configuration file
+
+The configuration for an import is now saved in a `.env` file in the project
+directory. This file follows the dotenv format. For more information, see
+the [installation chapter](Import.md#configuration-setup-in-env).
+
+To migrate to the new system, create a new project directory, add the `.env`
+file and port your custom configuration from `settings/local.php`. Most
+settings are named similar and only have received a `NOMINATIM_` prefix.
+Use the default settings in `settings/env.defaults` as a reference.
+
+### New location for data files
+
+External data files for Wikipedia importance, postcodes etc. are no longer
+expected to reside in the source tree by default. Instead they will be searched
+in the project directory. If you have an automated setup script you must
+either adapt the download location or explicitly set the location of the
+files to the old place in your `.env`.
+
+### Introducing `nominatim` command line tool
+
+The various php utilities have been replaced with a single `nominatim`
+command line tool. Make sure to adapt any scripts. There is no direct 1:1
+matching between the old utilities and the commands of nominatim CLI. The
+following list gives you a list of nominatim sub-commands that contain
+functionality of each script:
+
+* ./utils/setup.php: `import`, `freeze`, `refresh`
+* ./utils/update.php: `replication`, `add-data`, `index`, `refresh`
+* ./utils/specialphrases.php: `special-phrases`
+* ./utils/check_import_finished.php: `admin`
+* ./utils/warm.php: `admin`
+* ./utils/export.php: `export`
+
+Try `nominatim <command> --help` for more information about each subcommand.
+
+`./utils/query.php` no longer exists in its old form. `nominatim search`
+provides a replacement but returns different output.
+
+### Switch to normalized house numbers
+
+The housenumber column in the placex table uses now normalized version.
+The automatic migration step will convert the column but this may take a
+very long time. It is advisable to take the machine offline while doing that.
+
+## 3.5.0 -> 3.6.0
+
+### Change of layout of search_name_* tables
+
+The table need a different index for nearest place lookup. Recreate the
+indexes using the following shell script:
+
+```bash
+for table in `psql -d nominatim -c "SELECT tablename FROM pg_tables WHERE tablename LIKE 'search_name_%'" -tA | grep -v search_name_blank`;
+do
+ 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))";
+done
+```
+
+### Removal of html output
+
+The debugging UI is no longer directly provided with Nominatim. Instead we
+now provide a simple Javascript application. Please refer to
+[Setting up the Nominatim UI](Setup-Nominatim-UI.md) for details on how to
+set up the UI.
+
+The icons served together with the API responses have been moved to the
+nominatim-ui project as well. If you want to keep the `icon` field in the
+response, you need to set `CONST_MapIcon_URL` to the URL of the `/mapicon`
+directory of nominatim-ui.
+
+### Change order during indexing
+
+When reindexing places during updates, there is now a different order used
+which needs a different database index. Create it with the following SQL command:
+
+```sql
+CREATE INDEX idx_placex_pendingsector_rank_address
+ ON placex
+ USING BTREE (rank_address, geometry_sector)
+ WHERE indexed_status > 0;
+```
+
+You can then drop the old index with:
+
+```sql
+DROP INDEX idx_placex_pendingsector;
+```
+
+### Unused index
+
+This index has been unused ever since the query using it was changed two years ago. Saves about 12GB on a planet installation.
+
+```sql
+DROP INDEX idx_placex_geometry_reverse_lookupPoint;
+```
+
+### Switching to dotenv
+
+As part of the work changing the configuration format, the configuration for
+the website is now using a separate configuration file. To create the
+configuration file, run the following command after updating:
+
+```sh
+./utils/setup.php --setup-website
+```
+
+### Update SQL code
+
+To update the SQL code to the leatest version run:
+
+```
+./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
+```
+
+## 3.4.0 -> 3.5.0
### New Wikipedia/Wikidata importance tables
* download the new Wikipedia tables as described in the import section
* reimport the tables: `./utils/setup.php --import-wikipedia-articles`
* update the functions: `./utils/setup.php --create-functions --enable-diff-updates`
+ * create a new lookup index:
+```sql
+CREATE INDEX idx_placex_wikidata
+ ON placex
+ USING BTREE ((extratags -> 'wikidata'))
+ WHERE extratags ? 'wikidata'
+ AND class = 'place'
+ AND osm_type = 'N'
+ AND rank_search < 26;
+```
* compute importance: `./utils/update.php --recompute-importance`
The last step takes about 10 hours on the full planet.
+Remove one function (it will be recreated in the next step):
+
+```sql
+DROP FUNCTION create_country(hstore,character varying);
+```
+
+Finally, update all SQL functions:
+
+```sh
+./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
+```
+
## 3.3.0 -> 3.4.0
### Reorganisation of location_area_country table
CREATE INDEX idx_location_area_country_place_id ON location_area_country USING BTREE (place_id);
```
+Finally, update all SQL functions:
+
+```sh
+./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
+```
+
## 3.2.0 -> 3.3.0
### New database connection string (DSN) format
### Natural Earth country boundaries no longer needed as fallback
-```
+```sql
DROP TABLE country_naturalearthdata;
```
The reverse algorithm has changed and requires new indexes. Run the following
SQL statements to create the indexes:
-```
+```sql
CREATE INDEX idx_placex_geometry_reverse_lookupPoint
- ON placex USING gist (geometry)
- WHERE (name is not null or housenumber is not null or rank_address between 26 and 27)
- AND class not in ('railway','tunnel','bridge','man_made')
- AND rank_address >= 26 AND indexed_status = 0 AND linked_place_id is null;
+ ON placex
+ USING gist (geometry)
+ WHERE (name IS NOT null or housenumber IS NOT null or rank_address BETWEEN 26 AND 27)
+ AND class NOT IN ('railway','tunnel','bridge','man_made')
+ AND rank_address >= 26
+ AND indexed_status = 0
+ AND linked_place_id IS null;
CREATE INDEX idx_placex_geometry_reverse_lookupPolygon
ON placex USING gist (geometry)
WHERE St_GeometryType(geometry) in ('ST_Polygon', 'ST_MultiPolygon')
- AND rank_address between 4 and 25 AND type != 'postcode'
- AND name is not null AND indexed_status = 0 AND linked_place_id is null;
+ AND rank_address between 4 and 25
+ AND type != 'postcode'
+ AND name is not null
+ AND indexed_status = 0
+ AND linked_place_id is null;
CREATE INDEX idx_placex_geometry_reverse_placeNode
ON placex USING gist (geometry)
- WHERE osm_type = 'N' AND rank_search between 5 and 25
- AND class = 'place' AND type != 'postcode'
- AND name is not null AND indexed_status = 0 AND linked_place_id is null;
+ WHERE osm_type = 'N'
+ AND rank_search between 5 and 25
+ AND class = 'place'
+ AND type != 'postcode'
+ AND name is not null
+ AND indexed_status = 0
+ AND linked_place_id is null;
```
You also need to grant the website user access to the `country_osm_grid` table:
-```
+```sql
GRANT SELECT ON table country_osm_grid to "www-user";
```
You can now drop the unused indexes:
-```
+```sql
DROP INDEX idx_placex_reverse_geometry;
```
CREATE UNIQUE INDEX idx_postcode_id ON location_postcode USING BTREE (place_id);
CREATE INDEX idx_postcode_postcode ON location_postcode USING BTREE (postcode);
GRANT SELECT ON location_postcode TO "www-data";
-drop type if exists nearfeaturecentr cascade;
-create type nearfeaturecentr as (
+DROP TYPE IF EXISTS nearfeaturecentr CASCADE;
+CREATE TYPE nearfeaturecentr AS (
place_id BIGINT,
keywords int[],
rank_address smallint,
projects / nominatim.git / blobdiff