Re: [OSM-dev] hstore / db schema Was: Query-Formats
Brett Henderson schrieb: > I am currently building most of my applications around the osmosis > db schema but the split into node and node_tags and way and way_tags > is - hum - not very efficient. > > The current schema is fairly naive in its implementation. I hadn't > heard of hstore when implementing it. Perhaps the current schema needs > an upgrade :-) I'd suggest collecting more info about hstore-performance before changing anything. We're on the planet.import on dev-server and there's also a ticket open to get hstore-new to the wikimedia toolservers. There you can play with it and test its performance and if it's good then we should definitely give it a try! Peter ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
Re: [OSM-dev] hstore / db schema Was: Query-Formats
On Thu, Mar 25, 2010 at 3:42 AM, Florian Lohoff wrote: > On Tue, Mar 23, 2010 at 01:30:04PM +0100, Peter Körner wrote: > > Hi > > > > On the osm dev-server we're playing around with the postgres-hstore > > extension which allows us to repond to xapi-like queries, but with > > already assembled LIESTRINGs and such neat things. > > Which is not per se a feature of hstore ... hstore is just another > data type which is neat because it fits into the OSM model concerning > tags ... > > I am currently building most of my applications around the osmosis > db schema but the split into node and node_tags and way and way_tags > is - hum - not very efficient. > The current schema is fairly naive in its implementation. I hadn't heard of hstore when implementing it. Perhaps the current schema needs an upgrade :-) > This is why i would be interested in some tools to import a planet/sub > extract > into a more efficient db scheme which still allows to store all details > of the osm planet (which osm2pgsql does not) but is more efficient > concerning spatial queries. > > E.g. i'd like to drop way_tags and put them into a hstore tags column in > the > way table and then cluster the way table with the geom index on the > linestring > for example. > > Does anyone have speed/place comparisons? > ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
[OSM-dev] hstore / db schema Was: Query-Formats
On Tue, Mar 23, 2010 at 01:30:04PM +0100, Peter Körner wrote: > Hi > > On the osm dev-server we're playing around with the postgres-hstore > extension which allows us to repond to xapi-like queries, but with > already assembled LIESTRINGs and such neat things. Which is not per se a feature of hstore ... hstore is just another data type which is neat because it fits into the OSM model concerning tags ... I am currently building most of my applications around the osmosis db schema but the split into node and node_tags and way and way_tags is - hum - not very efficient. This is why i would be interested in some tools to import a planet/sub extract into a more efficient db scheme which still allows to store all details of the osm planet (which osm2pgsql does not) but is more efficient concerning spatial queries. E.g. i'd like to drop way_tags and put them into a hstore tags column in the way table and then cluster the way table with the geom index on the linestring for example. Does anyone have speed/place comparisons? Flo -- Florian Lohoff f...@zz.de "Es ist ein grobes Missverständnis und eine Fehlwahrnehmung, dem Staat im Internet Zensur- und Überwachungsabsichten zu unterstellen." - - Bundesminister Dr. Wolfgang Schäuble -- 10. Juli in Berlin signature.asc Description: Digital signature ___ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
