docs: adapt sizes to smaller place_address table

[nominatim.git] / docs / admin / Import-and-Update.md

diff --git a/docs/admin/Import-and-Update.md b/docs/admin/Import-and-Update.md
index 26ed9eb94788ee7b776f959b377cede5284b97bf..4a1aa96a69c84786a38325dc08fdb725003175ca 100644 (file)
--- a/docs/admin/Import-and-Update.md
+++ b/docs/admin/Import-and-Update.md
@@ -1,9 +1,11 @@
+# Importing and Updating the Database
+

 The following instructions explain how to create a Nominatim database
 from an OSM planet file and how to keep the database up to date. It
 is assumed that you have already successfully installed the Nominatim
 software itself, if not return to the [installation page](Installation.md).
 
 The following instructions explain how to create a Nominatim database
 from an OSM planet file and how to keep the database up to date. It
 is assumed that you have already successfully installed the Nominatim
 software itself, if not return to the [installation page](Installation.md).
 

-# Configuration setup in settings/local.php
+## Configuration setup in settings/local.php

 
 The Nominatim server can be customized via the file `settings/local.php`
 in the build directory. Note that this is a PHP file, so it must always
 
 The Nominatim server can be customized via the file `settings/local.php`
 in the build directory. Note that this is a PHP file, so it must always


@@ -16,7 +18,7 @@ without any leading spaces.
 There are lots of configuration settings you can tweak. Have a look
 at `settings/default.php` for a full list. Most should have a sensible default.
 
 There are lots of configuration settings you can tweak. Have a look
 at `settings/default.php` for a full list. Most should have a sensible default.
 

-### Flatnode files
+#### Flatnode files

 
 If you plan to import a large dataset (e.g. Europe, North America, planet),
 you should also enable flatnode storage of node locations. With this
 
 If you plan to import a large dataset (e.g. Europe, North America, planet),
 you should also enable flatnode storage of node locations. With this


@@ -29,9 +31,9 @@ Add to your `settings/local.php`:
 Replace the second part with a suitable path on your system and make sure
 the directory exists. There should be at least 40GB of free space.
 
 Replace the second part with a suitable path on your system and make sure
 the directory exists. There should be at least 40GB of free space.
 

-# Downloading additional data
+## Downloading additional data

 
 

-## Wikipedia rankings
+### Wikipedia rankings

 
 Wikipedia can be used as an optional auxiliary data source to help indicate
 the importance of osm features. Nominatim will work without this information
 
 Wikipedia can be used as an optional auxiliary data source to help indicate
 the importance of osm features. Nominatim will work without this information


@@ -49,17 +51,96 @@ size of nominatim. They also increase the install time by an hour or so.
 the initial import of the data if you want the rankings applied to the
 loaded data.
 
 the initial import of the data if you want the rankings applied to the
 loaded data.
 

-## UK postcodes
+### UK postcodes

 
 Nominatim can use postcodes from an external source to improve searches that involve a UK postcode. This data can be optionally downloaded: 
 
     cd $NOMINATIM_SOURCE_DIR/data
     wget https://www.nominatim.org/data/gb_postcode_data.sql.gz
 
 
 Nominatim can use postcodes from an external source to improve searches that involve a UK postcode. This data can be optionally downloaded: 
 
     cd $NOMINATIM_SOURCE_DIR/data
     wget https://www.nominatim.org/data/gb_postcode_data.sql.gz
 

+## Choosing the Data to Import
+
+In its default setup Nominatim is configured to import the full OSM data
+set for the entire planet. Such a setup requires a powerful machine with
+at least 32GB of RAM and around 800GB of SSD hard disks. Depending on your
+use case there are various ways to reduce the amount of data imported. This
+section discusses these methods. They can also be combined.
+
+### Using an extract
+
+If you only need geocoding for a smaller region, then precomputed 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
+below. 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
+boundaries. As a result some parts of the boundary may be missing which means
+that cannot compute the areas for some administrative areas.
+
+### Dropping Data Required for Dynamic Updates
+
+About half of the data in Nominatim's database is not really used for serving
+the API. It is only there to allow the data to be updated from the latest
+changes from OSM. For many uses these dynamic updates are not really required.
+If you don't plan to apply updates, the dynamic part of the database can be
+safely dropped using the following command:
+
+```
+./utils/setup.php --drop
+```
+
+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.
+
+### 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](http://photon.komoot.de/) database, then you can set up a database
+without search indexes. Add `--reverse-only` to your setup command above.
+
+This saves about 5% of disk space.
+
+### Filtering Imported Data
+
+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:

 
 

-# Initial import of the data
+* **settings/import-admin.style**
+  Only import administrative boundaries and places.
+* **settings/import-street.style**
+  Like the admin style but also adds streets.
+* **settings/import-address.style**
+  Import all data necessary to compute addresses down to house number level.
+* **settings/import-full.style**
+  Default style that also includes points of interest.

 
 

-**Important:** first try the import with a small excerpt, for example from
+The style can be changed with the configuration `CONST_Import_Style`.
+
+To give you an idea of the impact of using the different style, the table
+below gives rough estimates of the final database size after import of a
+2018 planet and after using the `--drop` option. It also shows the time
+needed for the import on a machine with 32GB RAM, 4 CPUS and SSDs. Note that
+the given sizes are just an estimate meant for comparison of style requirements.
+Your planet import is likely to be larger as the OSM data grows with time.
+
+style     | Import time  |  DB size   |  after drop
+----------|--------------|------------|------------
+admin     |    5h        |  190 GB    |   20 GB
+street    |   42h        |  400 GB    |  180 GB
+address   |   59h        |  500 GB    |  260 GB
+full      |   80h        |  575 GB    |  300 GB
+
+You can also customize the styles further. For an description of the
+style format see [the developement section](../develop/Import.md).
+
+## Initial import of the data
+
+**Important:** first try the import with a small extract, for example from

 [Geofabrik](https://download.geofabrik.de).
 
 Download the data to import and load the data with the following command:
 [Geofabrik](https://download.geofabrik.de).
 
 Download the data to import and load the data with the following command:


@@ -97,66 +178,44 @@ you also need to enable these key phrases like this:
 Note that this command downloads the phrases from the wiki link above.
 
 
 Note that this command downloads the phrases from the wiki link above.
 
 

-# Installing Tiger housenumber data for the US
-
-Nominatim is able to use the official TIGER 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:
+## Installing Tiger housenumber data for the US

 
 

-  1. Install the GDAL library and python bindings and the unzip tool
+Nominatim is able to use the official [TIGER](https://www.census.gov/geo/maps-data/data/tiger.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.

 
 

-       * Ubuntu: `sudo apt-get install python-gdal unzip`
-       * CentOS: `sudo yum install gdal-python unzip`
-
-  2. Get preprocessed TIGER 2015 data and unpack it into the
+  1. Get preprocessed TIGER 2018 data and unpack it into the

      data directory in your Nominatim sources:
 
         cd Nominatim/data
      data directory in your Nominatim sources:
 
         cd Nominatim/data

-        wget https://nominatim.org/data/tiger2017-nominatim-preprocessed.tar.gz
-        tar xf tiger2017-nominatim-preprocessed.tar.gz
+        wget https://nominatim.org/data/tiger2018-nominatim-preprocessed.tar.gz
+        tar xf tiger2018-nominatim-preprocessed.tar.gz
+
+    `data-source/us-tiger/README.md` explains how the data got preprocessed.

 
 

-  3. Import the data into your Nominatim database: 
+  2. Import the data into your Nominatim database: 

 
         ./utils/setup.php --import-tiger-data
 
 
         ./utils/setup.php --import-tiger-data
 

-  4. Enable use of the Tiger data in your `settings/local.php` by adding:
+  3. Enable use of the Tiger data in your `settings/local.php` by adding:

 
          @define('CONST_Use_US_Tiger_Data', true);
 
 
          @define('CONST_Use_US_Tiger_Data', true);
 

-  5. Apply the new settings:
+  4. Apply the new settings:

 
 ```sh
     ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
 ```
 
 
 ```sh
     ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
 ```
 

-The entire US adds about 10GB to your database.
-
-You can also process the data from the original TIGER data to create the
-SQL files, Nominatim needs for the import:
-
-  1. Get the TIGER 2017 data. You will need the EDGES files
-     (3,234 zip files, 11GB total). Choose one of the two sources:
-
-         wget -r ftp://ftp2.census.gov/geo/tiger/TIGER2017/EDGES/
-         wget -r ftp://mirror1.shellbot.com/census/geo/tiger/TIGER2017/EDGES/
-
-     The first one is the original source, the second a considerably faster
-     mirror.
-
-  2. Convert the data into SQL statements: 
-
-         ./utils/imports.php --parse-tiger <tiger edge data directory>
-
-Be warned that this can take quite a long time. After this process is finished,
-the same preprocessed files as above are available in `data/tiger`.

 
 

-# Updates
+## Updates

 
 There are many different possibilities to update your Nominatim database.
 The following section describes how to keep it up-to-date with Pyosmium.
 For a list of other methods see the output of `./utils/update.php --help`.
 
 
 There are many different possibilities to update your Nominatim database.
 The following section describes how to keep it up-to-date with Pyosmium.
 For a list of other methods see the output of `./utils/update.php --help`.
 

-### Installing the newest version of Pyosmium
+#### Installing the newest version of Pyosmium

 
 It is recommended to install Pyosmium via pip. Run (as the same user who
 will later run the updates):
 
 It is recommended to install Pyosmium via pip. Run (as the same user who
 will later run the updates):


@@ -165,7 +224,7 @@ will later run the updates):
 pip install --user osmium
 ```
 
 pip install --user osmium
 ```
 

-Nominatim needs a tool called `pyosmium-get-updates` that comes with
+Nominatim needs a tool called `pyosmium-get-updates`, which comes with

 Pyosmium. You need to tell Nominatim where to find it. Add the
 following line to your `settings/local.php`:
 
 Pyosmium. You need to tell Nominatim where to find it. Add the
 following line to your `settings/local.php`:
 


@@ -174,7 +233,7 @@ following line to your `settings/local.php`:
 The path above is fine if you used the `--user` parameter with pip.
 Replace `user` with your user name.
 
 The path above is fine if you used the `--user` parameter with pip.
 Replace `user` with your user name.
 

-### Setting up the update process
+#### Setting up the update process

 
 Next the update needs to be initialised. By default Nominatim is configured
 to update using the global minutely diffs.
 
 Next the update needs to be initialised. By default Nominatim is configured
 to update using the global minutely diffs.


@@ -200,7 +259,7 @@ what you expect.
 The --init-updates command needs to be rerun whenever the replication service
 is changed.
 
 The --init-updates command needs to be rerun whenever the replication service
 is changed.
 

-### Updating Nominatim
+#### Updating Nominatim

 
 The following command will keep your database constantly up to date:
 
 
 The following command will keep your database constantly up to date: