1 # Importing and Updating the Database
3 The following instructions explain how to create a Nominatim database
4 from an OSM planet file and how to keep the database up to date. It
5 is assumed that you have already successfully installed the Nominatim
6 software itself, if not return to the [installation page](Installation.md).
8 ## Configuration setup in settings/local.php
10 The Nominatim server can be customized via the file `settings/local.php`
11 in the build directory. Note that this is a PHP file, so it must always
16 without any leading spaces.
18 There are lots of configuration settings you can tweak. Have a look
19 at `settings/default.php` for a full list. Most should have a sensible default.
23 If you plan to import a large dataset (e.g. Europe, North America, planet),
24 you should also enable flatnode storage of node locations. With this
25 setting enabled, node coordinates are stored in a simple file instead
26 of the database. This will save you import time and disk storage.
27 Add to your `settings/local.php`:
29 @define('CONST_Osm2pgsql_Flatnode_File', '/path/to/flatnode.file');
31 Replace the second part with a suitable path on your system and make sure
32 the directory exists. There should be at least 40GB of free space.
34 ## Downloading additional data
36 ### Wikipedia rankings
38 Wikipedia can be used as an optional auxiliary data source to help indicate
39 the importance of osm features. Nominatim will work without this information
40 but it will improve the quality of the results if this is installed.
41 This data is available as a binary download:
43 cd $NOMINATIM_SOURCE_DIR/data
44 wget https://www.nominatim.org/data/wikipedia_article.sql.bin
45 wget https://www.nominatim.org/data/wikipedia_redirect.sql.bin
47 Combined the 2 files are around 1.5GB and add around 30GB to the install
48 size of nominatim. They also increase the install time by an hour or so.
50 *NOTE:* you'll need to download the Wikipedia rankings before performing
51 the initial import of the data if you want the rankings applied to the
56 Nominatim can use postcodes from an external source to improve searches that involve a UK postcode. This data can be optionally downloaded:
58 cd $NOMINATIM_SOURCE_DIR/data
59 wget https://www.nominatim.org/data/gb_postcode_data.sql.gz
62 ## Initial import of the data
64 **Important:** first try the import with a small excerpt, for example from
65 [Geofabrik](https://download.geofabrik.de).
67 Download the data to import and load the data with the following command:
70 ./utils/setup.php --osm-file <data file> --all [--osm2pgsql-cache 28000] 2>&1 | tee setup.log
73 The `--osm2pgsql-cache` parameter is optional but strongly recommended for
74 planet imports. It sets the node cache size for the osm2pgsql import part
75 (see `-C` parameter in osm2pgsql help). As a rule of thumb, this should be
76 about the same size as the file you are importing but never more than
77 2/3 of RAM available. If your machine starts swapping reduce the size.
79 Computing word frequency for search terms can improve the performance of
80 forward geocoding in particular under high load as it helps Postgres' query
81 planner to make the right decisions. To recompute word counts run:
84 ./utils/update.php --recompute-word-counts
87 This will take a couple of hours for a full planet installation. You can
88 also defer that step to a later point in time when you realise that
89 performance becomes an issue. Just make sure that updates are stopped before
90 running this function.
92 If you want to be able to search for places by their type through
93 [special key phrases](https://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases)
94 you also need to enable these key phrases like this:
96 ./utils/specialphrases.php --wiki-import > specialphrases.sql
97 psql -d nominatim -f specialphrases.sql
99 Note that this command downloads the phrases from the wiki link above.
101 ### Reverse-only Imports
103 If you only want to use the Nominatim database for reverse lookups or
104 if you plan to use the installation only for exports to a
105 [photon](http://photon.komoot.de/) database, then you can set up a database
106 without search indexes. Add `--reverse-only` to your setup command above.
108 This saves about 5% of disk space.
111 ## Installing Tiger housenumber data for the US
113 Nominatim is able to use the official [TIGER](https://www.census.gov/geo/maps-data/data/tiger.html)
114 address set to complement the OSM house number data in the US. You can add
115 TIGER data to your own Nominatim instance by following these steps. The
116 entire US adds about 10GB to your database.
118 1. Get preprocessed TIGER 2018 data and unpack it into the
119 data directory in your Nominatim sources:
122 wget https://nominatim.org/data/tiger2018-nominatim-preprocessed.tar.gz
123 tar xf tiger2018-nominatim-preprocessed.tar.gz
125 `data-source/us-tiger/README.md` explains how the data got preprocessed.
127 2. Import the data into your Nominatim database:
129 ./utils/setup.php --import-tiger-data
131 3. Enable use of the Tiger data in your `settings/local.php` by adding:
133 @define('CONST_Use_US_Tiger_Data', true);
135 4. Apply the new settings:
138 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
144 There are many different possibilities to update your Nominatim database.
145 The following section describes how to keep it up-to-date with Pyosmium.
146 For a list of other methods see the output of `./utils/update.php --help`.
148 #### Installing the newest version of Pyosmium
150 It is recommended to install Pyosmium via pip. Run (as the same user who
151 will later run the updates):
154 pip install --user osmium
157 Nominatim needs a tool called `pyosmium-get-updates`, which comes with
158 Pyosmium. You need to tell Nominatim where to find it. Add the
159 following line to your `settings/local.php`:
161 @define('CONST_Pyosmium_Binary', '/home/user/.local/bin/pyosmium-get-changes');
163 The path above is fine if you used the `--user` parameter with pip.
164 Replace `user` with your user name.
166 #### Setting up the update process
168 Next the update needs to be initialised. By default Nominatim is configured
169 to update using the global minutely diffs.
171 If you want a different update source you will need to add some settings
172 to `settings/local.php`. For example, to use the daily country extracts
173 diffs for Ireland from geofabrik add the following:
175 // base URL of the replication service
176 @define('CONST_Replication_Url', 'https://download.geofabrik.de/europe/ireland-and-northern-ireland-updates');
177 // How often upstream publishes diffs
178 @define('CONST_Replication_Update_Interval', '86400');
179 // How long to sleep if no update found yet
180 @define('CONST_Replication_Recheck_Interval', '900');
182 To set up the update process now run the following command:
184 ./utils/update.php --init-updates
186 It outputs the date where updates will start. Recheck that this date is
189 The --init-updates command needs to be rerun whenever the replication service
192 #### Updating Nominatim
194 The following command will keep your database constantly up to date:
196 ./utils/update.php --import-osmosis-all
198 (Note that even though the old name "import-osmosis-all" has been kept for compatibility reasons, Osmosis is not required to run this - it uses pyosmium behind the scenes.)
200 If you have imported multiple country extracts and want to keep them
201 up-to-date, have a look at the script in
202 [issue #60](https://github.com/openstreetmap/Nominatim/issues/60).