I'm a beginner in Openstreetmap, and I have some questions I didn't find answer yet.
I created my own server tile through this tutorial:
https://switch2osm.org/serving-tiles/manually-building-a-tile-server-14-04/
Now, I need to do some queries locally, but I noticed that overpass api have a installation, and in its tutorial has the following description:
http://wiki.openstreetmap.org/wiki/Overpass_API/Installation
NOTE: You do not need a database engine (e.g. MySQL or PostgreSQL); the database back-end is included in the OSM3S package.
So, I have my own server tile running, do I need run this full installation? Or is there a way to I use overpass search from my Postgres (postgis) database?
I'm little confused because it has its own database (overpass)(?) according to main description.
In summary: Make it some sense I run queries from my own tile server database, or I need install overpass database and run queries on overpass api database and so plot on my tile server?
If it is possible, someone has some tutorial to indicate me?
Best Answer
Overpass API needs its very own database because it has to perform very different queries compared to a tile server. Likewise if you intend to set up a geocoder (e.g. Nominatim) you will also need a different database for the very same reasons.
It's all about performance optimization. Usually these services are deployed on different physical systems so that's not a problem. Theoretically it would be possible to use a single database for all services but that would be horribly slow.