indexing: precompute row counts

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

diff --git a/docs/admin/Import.md b/docs/admin/Import.md
index 280231b670dfaab8a948bbb4c14874022b46ecdd..5a365b236b5897adcae2e6423369b5b2426174db 100644 (file)
--- a/docs/admin/Import.md
+++ b/docs/admin/Import.md
@@ -2,7 +2,8 @@
 
 The following instructions explain how to create a Nominatim database
 from an OSM planet file. It is assumed that you have already successfully
 
 The following instructions explain how to create a Nominatim database
 from an OSM planet file. It is assumed that you have already successfully

-installed the Nominatim software itself. If this is not the case, return to the
+installed the Nominatim software itself and the `nominatim` tool can be found
+in your `PATH`. If this is not the case, return to the

 [installation page](Installation.md).
 
 ## Creating the project directory
 [installation page](Installation.md).
 
 ## Creating the project directory


@@ -10,33 +11,24 @@ installed the Nominatim software itself. If this is not the case, return to the
 Before you start the import, you should create a project directory for your
 new database installation. This directory receives all data that is related
 to a single Nominatim setup: configuration, extra data, etc. Create a project
 Before you start the import, you should create a project directory for your
 new database installation. This directory receives all data that is related
 to a single Nominatim setup: configuration, extra data, etc. Create a project

-directory apart from the Nominatim software:
+directory apart from the Nominatim software and change into the directory:

 
 ```
 
 ```

-mkdir ~/nominatim-planet
+mkdir ~/nominatim-project
+cd ~/nominatim-project

 ```
 
 In the following, we refer to the project directory as `$PROJECT_DIR`. To be
 able to copy&paste instructions, you can export the appropriate variable:
 
 ```
 ```
 
 In the following, we refer to the project directory as `$PROJECT_DIR`. To be
 able to copy&paste instructions, you can export the appropriate variable:
 
 ```

-export PROJECT_DIR=~/nominatim-planet
+export PROJECT_DIR=~/nominatim-project

 ```
 
 The Nominatim tool assumes per default that the current working directory is
 the project directory but you may explicitly state a different directory using
 ```
 
 The Nominatim tool assumes per default that the current working directory is
 the project directory but you may explicitly state a different directory using

-the `--project-dir` parameter. The following instructions assume that you have
-added the Nominatim build directory to your PATH and run all directories from
-the project directory. If you haven't done yet, add the build directory to your
-path and change to the new project directory:
-
-```
-export PATH=~/Nominatim/build:$PATH
-cd $PROJECT_DIR
-```
-
-Of course, you have to replace the path above with the location of your build
-directory.
+the `--project-dir` parameter. The following instructions assume that you run
+all commands from the project directory.

 
 !!! tip "Migration Tip"
 
 
 !!! tip "Migration Tip"
 


@@ -48,15 +40,16 @@ directory.
 
 ### Configuration setup in `.env`
 
 
 ### Configuration setup in `.env`
 

-The Nominatim server can be customized via a `.env` in the project directory.
-This is a file in [dotenv](https://github.com/theskumar/python-dotenv) format
-which looks the same as variable settings in a standard shell environment.
+The Nominatim server can be customized via an `.env` configuration file in the 
+project directory. This is a file in [dotenv](https://github.com/theskumar/python-dotenv)
+format which looks the same as variable settings in a standard shell environment.

 You can also set the same configuration via environment variables. All
 settings have a `NOMINATIM_` prefix to avoid conflicts with other environment
 variables.
 
 You can also set the same configuration via environment variables. All
 settings have a `NOMINATIM_` prefix to avoid conflicts with other environment
 variables.
 

-There are lots of configuration settings you can tweak. Have a look
-at `settings/env.default` for a full list. Most should have a sensible default.
+There are lots of configuration settings you can tweak. A full reference
+can be found in the chapter [Configuration Settings](../customize/Settings.md).
+Most should have a sensible default.

 
 #### Flatnode files
 
 
 #### Flatnode files
 


@@ -81,25 +74,32 @@ but it will improve the quality of the results if this is installed.
 This data is available as a binary download. Put it into your project directory:
 
     cd $PROJECT_DIR
 This data is available as a binary download. Put it into your project directory:
 
     cd $PROJECT_DIR

-    wget https://www.nominatim.org/data/wikimedia-importance.sql.gz
+    wget https://nominatim.org/data/wikimedia-importance.csv.gz
+    wget -O secondary_importance.sql.gz https://nominatim.org/data/wikimedia-secondary-importance.sql.gz

 
 

-The file is about 400MB and adds around 4GB to the Nominatim database.
+The files are about 400MB and add around 4GB to the Nominatim database. For
+more information about importance,
+see [Importance Customization](../customize/Importance.md).

 
 !!! tip
 
 !!! tip

-    If you forgot to download the wikipedia rankings, you can also add
-    importances after the import. Download the files, then run
-    `nominatim refresh --wiki-data --importance`. Updating importances for
-    a planet can take a couple of hours.
+    If you forgot to download the wikipedia rankings, then you can
+    also add importances after the import. Download the SQL files, then
+    run `nominatim refresh --wiki-data --secondary-importance --importance`.
+    Updating importances for a planet will take a couple of hours.

 
 

-### Great Britain, USA postcodes
+### External postcodes

 
 

-Nominatim can use postcodes from an external source to improve searches that
-involve a GB or US postcode. This data can be optionally downloaded into the
-project directory:
+Nominatim can use postcodes from an external source to improve searching with
+postcodes. We provide precomputed postcodes sets for the US (using TIGER data)
+and the UK (using the [CodePoint OpenData set](https://osdatahub.os.uk/downloads/open/CodePointOpen).
+This data can be optionally downloaded into the project directory:

 
     cd $PROJECT_DIR
 
     cd $PROJECT_DIR

-    wget https://www.nominatim.org/data/gb_postcode_data.sql.gz
-    wget https://www.nominatim.org/data/us_postcode_data.sql.gz
+    wget https://nominatim.org/data/gb_postcodes.csv.gz
+    wget https://nominatim.org/data/us_postcodes.csv.gz
+
+You can also add your own custom postcode sources, see
+[Customization of postcodes](../customize/Postcodes.md).

 
 ## Choosing the data to import
 
 
 ## Choosing the data to import
 


@@ -115,7 +115,7 @@ If you only need geocoding for a smaller region, then precomputed OSM extracts
 are a good way to reduce the database size and import time.
 [Geofabrik](https://download.geofabrik.de) offers extracts for most countries.
 They even have daily updates which can be used with the update process described
 are a good way to reduce the database size and import time.
 [Geofabrik](https://download.geofabrik.de) offers extracts for most countries.
 They even have daily updates which can be used with the update process described

-[in the next section](../Update). There are also
+[in the next section](Update.md). There are also

 [other providers for extracts](https://wiki.openstreetmap.org/wiki/Planet.osm#Downloading).
 
 Please be aware that some extracts are not cut exactly along the country
 [other providers for extracts](https://wiki.openstreetmap.org/wiki/Planet.osm#Downloading).
 
 Please be aware that some extracts are not cut exactly along the country


@@ -141,14 +141,22 @@ Note that you still need to provide for sufficient disk space for the initial
 import. So this option is particularly interesting if you plan to transfer the
 database or reuse the space later.
 
 import. So this option is particularly interesting if you plan to transfer the
 database or reuse the space later.
 

+!!! warning
+    The data structure for updates are also required when adding additional data
+    after the import, for example [TIGER housenumber data](../customize/Tiger.md).
+    If you plan to use those, you must not use the `--no-updates` parameter.
+    Do a normal import, add the external data and once you are done with
+    everything run `nominatim freeze`.
+
+

 ### Reverse-only Imports
 
 If you only want to use the Nominatim database for reverse lookups or
 if you plan to use the installation only for exports to a
 ### Reverse-only Imports
 
 If you only want to use the Nominatim database for reverse lookups or
 if you plan to use the installation only for exports to a

-[photon](https://photon.komoot.de/) database, then you can set up a database
+[photon](https://photon.komoot.io/) database, then you can set up a database

 without search indexes. Add `--reverse-only` to your setup command above.
 
 without search indexes. Add `--reverse-only` to your setup command above.
 

-This saves about 5% of disk space.
+This saves about 5% of disk space, import time won't be significant faster.

 
 ### Filtering Imported Data
 
 
 ### Filtering Imported Data
 


@@ -156,15 +164,15 @@ Nominatim normally sets up a full search database containing administrative
 boundaries, places, streets, addresses and POI data. There are also other
 import styles available which only read selected data:
 
 boundaries, places, streets, addresses and POI data. There are also other
 import styles available which only read selected data:
 

-* **settings/import-admin.style**
+* **admin**

   Only import administrative boundaries and places.
   Only import administrative boundaries and places.

-* **settings/import-street.style**
+* **street**

   Like the admin style but also adds streets.
   Like the admin style but also adds streets.

-* **settings/import-address.style**
+* **address**

   Import all data necessary to compute addresses down to house number level.
   Import all data necessary to compute addresses down to house number level.

-* **settings/import-full.style**
+* **full**

   Default style that also includes points of interest.
   Default style that also includes points of interest.

-* **settings/import-extratags.style**
+* **extratags**

   Like the full style but also adds most of the OSM tags into the extratags
   column.
 
   Like the full style but also adds most of the OSM tags into the extratags
   column.
 


@@ -187,8 +195,8 @@ full      |   54h        |  640 GB    |  330 GB
 extratags |   54h        |  650 GB    |  340 GB
 
 You can also customize the styles further.
 extratags |   54h        |  650 GB    |  340 GB
 
 You can also customize the styles further.

-A [description of the style format](../develop/Import.md#configuring-the-import) 
-can be found in the development section.
+A [description of the style format](../customize/Import-Styles.md)
+can be found in the customization guide.

 
 ## Initial import of the data
 
 
 ## Initial import of the data
 


@@ -197,12 +205,15 @@ can be found in the development section.
     [Geofabrik](https://download.geofabrik.de).
 
 Download the data to import. Then issue the following command
     [Geofabrik](https://download.geofabrik.de).
 
 Download the data to import. Then issue the following command

-from the **build directory** to start the import:
+from the **project directory** to start the import:

 
 ```sh
 nominatim import --osm-file <data file> 2>&1 | tee setup.log
 ```
 
 
 ```sh
 nominatim import --osm-file <data file> 2>&1 | tee setup.log
 ```
 

+The **project directory** is the one that you have set up at the beginning.
+See [creating the project directory](#creating-the-project-directory).
+

 ### Notes on full planet imports
 
 Even on a perfectly configured machine
 ### Notes on full planet imports
 
 Even on a perfectly configured machine


@@ -220,7 +231,7 @@ to load the OSM data into the PostgreSQL database. This step is very demanding
 in terms of RAM usage. osm2pgsql and PostgreSQL are running in parallel at 
 this point. PostgreSQL blocks at least the part of RAM that has been configured
 with the `shared_buffers` parameter during
 in terms of RAM usage. osm2pgsql and PostgreSQL are running in parallel at 
 this point. PostgreSQL blocks at least the part of RAM that has been configured
 with the `shared_buffers` parameter during

-[PostgreSQL tuning](Installation#postgresql-tuning)
+[PostgreSQL tuning](Installation.md#tuning-the-postgresql-database)

 and needs some memory on top of that. osm2pgsql needs at least 2GB of RAM for
 its internal data structures, potentially more when it has to process very large
 relations. In addition it needs to maintain a cache for node locations. The size
 and needs some memory on top of that. osm2pgsql needs at least 2GB of RAM for
 its internal data structures, potentially more when it has to process very large
 relations. In addition it needs to maintain a cache for node locations. The size


@@ -239,79 +250,90 @@ reduce the cache size or even consider using a flatnode file.
 
 ### Testing the installation
 
 
 ### Testing the installation
 

-Run this script to verify all required tables and indices got created successfully.
+Run this script to verify that all required tables and indices got created
+successfully.

 
 ```sh
 
 ```sh

-nominatim check-database
+nominatim admin --check-database

 ```
 
 ```
 

-Now you can try out your installation by running:
+Now you can try out your installation by executing a simple query on the
+command line:

 
 

-```sh
-nominatim serve
+``` sh
+nominatim search --query Berlin

 ```
 
 ```
 

-This runs a small test server normally used for development. You can use it
-to verify that your installation is working. Go to
-`http://localhost:8088/status.php` and you should see the message `OK`.
-You can also run a search query, e.g. `http://localhost:8088/search.php?q=Berlin`.
+or, when you have a reverse-only installation:

 
 

-To run Nominatim via webservers like Apache or nginx, please read the
-[Deployment chapter](Deployment.md).
+``` sh
+nominatim reverse --lat 51 --lon 45
+```

 
 

-## Tuning the database
+If you want to run Nominatim as a service, you need to make a choice between
+running the modern Python frontend and the legacy PHP frontend.
+Make sure you have installed the right packages as per
+[Installation](Installation.md#software).

 
 

-Accurate word frequency information for search terms helps PostgreSQL's query
-planner to make the right decisions. Recomputing them can improve the performance
-of forward geocoding in particular under high load. To recompute word counts run:
+#### Testing the Python frontend

 
 

-```sh
-nominatim refresh --word-counts
-```
+To run the test server against the Python frontend, you must choose a
+web framework to use, either starlette or falcon. Make sure the appropriate
+packages are installed. Then run

 
 

-This will take a couple of hours for a full planet installation. You can
-also defer that step to a later point in time when you realise that
-performance becomes an issue. Just make sure that updates are stopped before
-running this function.
+``` sh
+nominatim serve
+```

 
 

-If you want to be able to search for places by their type through
-[special key phrases](https://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases)
-you also need to enable these key phrases like this:
+or, if you prefer to use Starlette instead of Falcon as webserver,

 
 

-    nominatim special-phrases --from-wiki > specialphrases.sql
-    psql -d nominatim -f specialphrases.sql
+``` sh
+nominatim serve --engine starlette
+```

 
 

-Note that this command downloads the phrases from the wiki link above. You
-need internet access for the step.
+Go to `http://localhost:8088/status.php` and you should see the message `OK`.
+You can also run a search query, e.g. `http://localhost:8088/search.php?q=Berlin`
+or, for reverse-only installations a reverse query,
+e.g. `http://localhost:8088/reverse.php?lat=27.1750090510034&lon=78.04209025`.

 
 

+Do not use this test server in production.
+To run Nominatim via webservers like Apache or nginx, please continue reading
+[Deploy the Python frontend](Deployment-Python.md).

 
 

-## Installing Tiger housenumber data for the US
+#### Testing the PHP frontend

 
 

-Nominatim is able to use the official [TIGER](https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.html)
-address set to complement the OSM house number data in the US. You can add
-TIGER data to your own Nominatim instance by following these steps. The
-entire US adds about 10GB to your database.
+!!! danger
+    The PHP fronted is deprecated and will be removed in Nominatim 5.0.

 
 

-  1. Get preprocessed TIGER 2019 data and unpack it into your project
-     directory:
+You can run a small test server with the PHP frontend like this:

 
 

-        cd $PROJECT_DIR
-        wget https://nominatim.org/data/tiger2019-nominatim-preprocessed.tar.gz
-        tar xf tiger2019-nominatim-preprocessed.tar.gz
+```sh
+nominatim serve --engine php
+```

 
 

-  2. Import the data into your Nominatim database:
+Go to `http://localhost:8088/status.php` and you should see the message `OK`.
+You can also run a search query, e.g. `http://localhost:8088/search.php?q=Berlin`
+or, for reverse-only installations a reverse query,
+e.g. `http://localhost:8088/reverse.php?lat=27.1750090510034&lon=78.04209025`.

 
 

-        nominatim add-data --tiger-data tiger
+Do not use this test server in production.
+To run Nominatim via webservers like Apache or nginx, please continue reading
+[Deploy the PHP frontend](Deployment-PHP.md).

 
 

-  3. Enable use of the Tiger data in your `.env` by adding:

 
 

-        echo NOMINATIM_USE_US_TIGER_DATA=yes >> .env

 
 

-  4. Apply the new settings:
+## Enabling search by category phrases

 
 

-        nominatim refresh --functions
+To be able to search for places by their type using
+[special phrases](https://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases)
+you also need to import these key phrases like this:

 
 

+```sh
+nominatim special-phrases --import-from-wiki
+```

 
 

-See the [developer's guide](../develop/data-sources.md#us-census-tiger) for more
-information on how the data got preprocessed.
+Note that this command downloads the phrases from the wiki link above. You
+need internet access for the step.

 
 

+You can also import special phrases from a csv file, for more 
+information please see the [Customization part](../customize/Special-Phrases.md).