Stephan, what's the size of your db? if it's under 10G, how about just dump the full directory into to a ramfs. leave 1G to jvm and it'll do heavy io on the ramfs. i think it's a simple solution and could yield interesting result. please let me know the result if you tried. thanks
On Tue, Sep 20, 2011 at 5:41 PM, Peter Neubauer <peter.neuba...@neotechnology.com> wrote: > Steven, > the index is built into the DB, so you can use something like > http://docs.neo4j.org/chunked/snapshot/tutorials-java-embedded-index.html > to index all your nodes into Lucene (in one index, the node as key, > the number of relationships as numeric value when creating them). When > reading, you would simply request all keys from the index and iterate > over them. I am not terribly sure how much fast it is, but given that > you are just loading up documents, Lucene should be reasonably fast. > > Let us know if that works out! > > 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 Tue, Sep 20, 2011 at 6:01 PM, st3ven <st3...@web.de> wrote: >> Hello Peter, >> >> it's a pity that neo4j doesn't support full graph-scans. >> >> Is there maybe a possibility to cache more relationships to speed things up >> a little bit. >> I recognized that only the iteration over the relationships is taking hours. >> The time to get all relationships of one node is quite fast. >> >> I think I could try your second solution: >> - Store the relationships as a property in an Index (e.g. Lucene) and >> as the index for all entries. Thus, you are using an index for what it >> is good at - global operations over all documents. >> >> But I didn't understood it correctly. Do you mean an Index which stores the >> ID of a relationship and creating such an Index for every node? >> Could you maybe give me a code example for that? >> That would be very kind of you. >> >> The first solution is not really realizable, because I don't know the number >> of relationships of every node. >> I would have to count the relationships before the insertion and that would >> make my database useless for the node degree query. >> >> Thank you very much for your help! >> >> Cheers, >> Stephan >> >> -- >> View this message in context: >> http://neo4j-community-discussions.438527.n3.nabble.com/Creating-a-graph-database-with-BatchInserter-and-getting-the-node-degree-of-every-node-tp3351599p3352509.html >> Sent from the Neo4j Community Discussions mailing list archive at Nabble.com. >> _______________________________________________ >> Neo4j mailing list >> User@lists.neo4j.org >> https://lists.neo4j.org/mailman/listinfo/user >> > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > -- Best regards Linan Wang _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
