[OSM-dev] osm2pgsql(-ng)?

Steve Hill steve at nexusuk.org
Wed Apr 9 11:23:29 BST 2008

On Wed, 9 Apr 2008, Martijn van Oosterhout wrote:

> - Direct loading of planet-diffs

I've been knocking together a python script to load all the OSM data into 
Postgresql and generate the tables needed for Mapnik, with support for 
the Osmosis diffs.  The problems I have at the moment are:

1. It needs a lot of disk space for the database because you need to 
store the entire OSM dataset rather than just the cut-down data used by 
2. The initial import of the planet data is slooowww.  Partly because it 
is Python (which I used to make development quicker with the aim or 
porting to C at a later date if necessary), but mostly just due to the 
amount of data being stuffed into Postgres.  I guess this isn't a big deal 
since once the initial import is done you can import diffs relatively 
3. I chose to use the pgdb library to talk to Postgresql, but it turns out 
that it doesn't support cursors properly so this is causing me some issues 
when selecting large datasets from the DB.

What kind of figures are we talking about for disk space and time needed 
to do a planet import with osm2pgsql in slim mode?  I'm interested in 
whether you've got a better solution to me. :)

  - Steve
    xmpp:steve at nexusuk.org   sip:steve at nexusuk.org   http://www.nexusuk.org/

      Servatis a periculum, servatis a maleficum - Whisper, Evanescence

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