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.
102 ## Installing Tiger housenumber data for the US
104 Nominatim is able to use the official TIGER address set to complement the
105 OSM house number data in the US. You can add TIGER data to your own Nominatim
106 instance by following these steps:
108 1. Install the GDAL library and python bindings and the unzip tool
110 * Ubuntu: `sudo apt-get install python-gdal unzip`
111 * CentOS: `sudo yum install gdal-python unzip`
113 2. Get preprocessed TIGER 2017 data and unpack it into the
114 data directory in your Nominatim sources:
117 wget https://nominatim.org/data/tiger2017-nominatim-preprocessed.tar.gz
118 tar xf tiger2017-nominatim-preprocessed.tar.gz
120 3. Import the data into your Nominatim database:
122 ./utils/setup.php --import-tiger-data
124 4. Enable use of the Tiger data in your `settings/local.php` by adding:
126 @define('CONST_Use_US_Tiger_Data', true);
128 5. Apply the new settings:
131 ./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
134 The entire US adds about 10GB to your database.
136 You can also process the data from the original TIGER data to create the
137 SQL files, Nominatim needs for the import:
139 1. Get the TIGER 2017 data. You will need the EDGES files
140 (3,234 zip files, 11GB total).
142 wget -r ftp://ftp2.census.gov/geo/tiger/TIGER2017/EDGES/
144 2. Convert the data into SQL statements:
146 ./utils/imports.php --parse-tiger <tiger edge data directory>
148 Be warned that this can take quite a long time. After this process is finished,
149 the same preprocessed files as above are available in `data/tiger`.
153 There are many different possibilities to update your Nominatim database.
154 The following section describes how to keep it up-to-date with Pyosmium.
155 For a list of other methods see the output of `./utils/update.php --help`.
157 #### Installing the newest version of Pyosmium
159 It is recommended to install Pyosmium via pip. Run (as the same user who
160 will later run the updates):
163 pip install --user osmium
166 Nominatim needs a tool called `pyosmium-get-updates`, which comes with
167 Pyosmium. You need to tell Nominatim where to find it. Add the
168 following line to your `settings/local.php`:
170 @define('CONST_Pyosmium_Binary', '/home/user/.local/bin/pyosmium-get-changes');
172 The path above is fine if you used the `--user` parameter with pip.
173 Replace `user` with your user name.
175 #### Setting up the update process
177 Next the update needs to be initialised. By default Nominatim is configured
178 to update using the global minutely diffs.
180 If you want a different update source you will need to add some settings
181 to `settings/local.php`. For example, to use the daily country extracts
182 diffs for Ireland from geofabrik add the following:
184 // base URL of the replication service
185 @define('CONST_Replication_Url', 'https://download.geofabrik.de/europe/ireland-and-northern-ireland-updates');
186 // How often upstream publishes diffs
187 @define('CONST_Replication_Update_Interval', '86400');
188 // How long to sleep if no update found yet
189 @define('CONST_Replication_Recheck_Interval', '900');
191 To set up the update process now run the following command:
193 ./utils/update.php --init-updates
195 It outputs the date where updates will start. Recheck that this date is
198 The --init-updates command needs to be rerun whenever the replication service
201 #### Updating Nominatim
203 The following command will keep your database constantly up to date:
205 ./utils/update.php --import-osmosis-all
207 (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.)
209 If you have imported multiple country extracts and want to keep them
210 up-to-date, have a look at the script in
211 [issue #60](https://github.com/openstreetmap/Nominatim/issues/60).