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
!!! warning
The datastructure for updates are also required when adding additional data
- after the import, for example [TIGER housenumber data](Customization#installing-tiger-housenumber-data-for-the-us).
+ 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`.
extratags | 54h | 650 GB | 340 GB
You can also customize the styles further.
-A [description of the style format](../customize/Import-Styles.md)
+A [description of the style format](../customize/Import-Styles.md)
can be found in the customization guide.
## Initial import of the data
```
The **project directory** is the one that you have set up at the beginning.
-See [creating the project directory](Import#creating-the-project-directory).
+See [creating the project directory](#creating-the-project-directory).
### Notes on full planet imports
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#postgresql-tuning)
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
running this function.
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)
+[special phrases](https://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases)
you also need to import these key phrases like this:
```sh
need internet access for the step.
You can also import special phrases from a csv file, for more
-information please read the [Customization chapter](Customization.md).
+information please see the [Customization part](../customize/Special-Phrases.md).