docs: rework library getting started

[nominatim.git] / docs / admin / Migration.md

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 66b4c28b41046134058c0ada04424367e8336e5e..75f891412e8cf48f8644adab9e1c39d78377aae4 100644 (file)
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -1,18 +1,164 @@
 # Database Migrations
 
 # Database Migrations
 

-This page describes database migrations necessary to update existing databases
-to newer versions of Nominatim.
+Nominatim offers automatic migrations since version 3.7. 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

 
 

-## 3.5.0 -> 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 <3.6, then you still have to follow
+    the manual migration steps up to 3.6.
+
+## 4.4.0 -> master
+
+### 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
 
 ### 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) for details on how 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
 set up the UI.
 
 The icons served together with the API responses have been moved to the


@@ -27,13 +173,15 @@ which needs a different database index. Create it with the following SQL command
 
 ```sql
 CREATE INDEX idx_placex_pendingsector_rank_address
 
 ```sql
 CREATE INDEX idx_placex_pendingsector_rank_address

-  ON placex USING BTREE (rank_address, geometry_sector) where indexed_status > 0;
+  ON placex
+  USING BTREE (rank_address, geometry_sector)
+  WHERE indexed_status > 0;

 ```
 
 You can then drop the old index with:
 
 ```sql
 ```
 
 You can then drop the old index with:
 
 ```sql

-DROP INDEX idx_placex_pendingsector
+DROP INDEX idx_placex_pendingsector;

 ```
 
 ### Unused index
 ```
 
 ### Unused index


@@ -41,7 +189,7 @@ DROP INDEX idx_placex_pendingsector
 This index has been unused ever since the query using it was changed two years ago. Saves about 12GB on a planet installation.
 
 ```sql
 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
+DROP INDEX idx_placex_geometry_reverse_lookupPoint;

 ```
 
 ### Switching to dotenv
 ```
 
 ### Switching to dotenv


@@ -54,6 +202,14 @@ configuration file, run the following command after updating:
 ./utils/setup.php --setup-website
 ```
 
 ./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
 ## 3.4.0 -> 3.5.0
 
 ### New Wikipedia/Wikidata importance tables


@@ -66,10 +222,14 @@ follows:
   * 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:
   * 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:

-```
-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
+```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`
 
 ```
   * compute importance: `./utils/update.php --recompute-importance`
 


@@ -126,7 +286,7 @@ The new format is
 
 ### Natural Earth country boundaries no longer needed as fallback
 
 
 ### Natural Earth country boundaries no longer needed as fallback
 

-```
+```sql

 DROP TABLE country_naturalearthdata;
 ```
 
 DROP TABLE country_naturalearthdata;
 ```
 


@@ -152,27 +312,37 @@ following command:
 The reverse algorithm has changed and requires new indexes. Run the following
 SQL statements to create the indexes:
 
 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
 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')
 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)
 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:
 
 ```
 
 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";
 ```
 
 GRANT SELECT ON table country_osm_grid to "www-user";
 ```
 


@@ -180,7 +350,7 @@ Replace the `www-user` with the user name of your website server if necessary.
 
 You can now drop the unused indexes:
 
 
 You can now drop the unused indexes:
 

-```
+```sql

 DROP INDEX idx_placex_reverse_geometry;
 ```
 
 DROP INDEX idx_placex_reverse_geometry;
 ```
 


@@ -209,8 +379,8 @@ CREATE INDEX idx_postcode_geometry ON location_postcode USING GIST (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";
 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,
   place_id BIGINT,
   keywords int[],
   rank_address smallint,