Daniel, for OSM data and GIS, have you looked at https://github.com/neo4j/spatial, especially the OSM examples at https://github.com/neo4j/spatial/blob/master/src/test/java/org/neo4j/gis/spatial/pipes/GeoPipesTest.java and https://github.com/neo4j/spatial/blob/master/src/test/java/org/neo4j/gis/spatial/OsmAnalysisTest.java ?
Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/ - Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Fri, Oct 7, 2011 at 3:46 PM, danielb <[email protected]> wrote: > Hello Chris, > > thanks for your postings, they are a great starting point for me to assume a > good performance of this database. However I have some questions left. > Lets say I have a node store and a property store. Both of them are > individual files. I am going to implement a GIS application which fetches > OSM data from the hard disk. When I load a bounding box I want to avoid to > many random reads from the disk. > More precisely I want to load nodes and properties inside a given bounding > box. It would be great if both the nodes and the properties are organized in > successive blocks. Is there one id-pool for both nodes and properties, so > that I can load for example the nodes with id 1 and 2 and the properties 3, > 4 and 5 with one block read? I can be totally wrong because if I save a new > node file with id 1, 2 and then save a new property file with id 3, it will > start on a new block (windows block size like 4K). When then writing a new > node id it would be saved in the first block I guess. What about > fragmentation? And is there an improvement when using a Linux system > (inodes? I don't know Linux well)? When I am finished with saving the nodes > and properties is there some way of reorganization on the hard disk? Lets > say I want to enter a new node which is connected to a low id. Will it get > the first free id (and it will be saved on the other end of the harddisk > perhaps) or does it just get an allready used id and the following records > will be reorganized (insert performance)? > Maybe I am totally wrong about this, but I would appreciate an efficient way > of storage for GIS data. > > best regards, Daniel > > -- > View this message in context: > http://neo4j-community-discussions.438527.n3.nabble.com/Neo4j-low-level-data-storage-tp3336483p3402827.html > Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
