Jim, I was going through Cypher and a question came into my mind regarding pattern matching... How is pattern matching done in neo4j? I mean, how are nodes and relationships matched in case of large data-sets?
On 6/18/11, Aman <aman.6...@gmail.com> wrote: > Jim, > Thanks for the valuable input... The use case I mentioned here (using > only visited places) was a simplistic version of the real one, > because, just as you said, I'd be getting large number of results in > that case... I'd check out pattern matching and Cypher to ease me in > my project... Neo4j team is truly awesome! You guys are always there > to help... > > On 6/18/11, Jim Webber <j...@neotechnology.com> wrote: >> That's a great point. >> >> In Neo4j you can add properties to your relationships so that: >> >> Jim --VISITED (numberOfTimes: 20) --> Melbourne >> >> Then you can use the "numberOfTimes" property to determine whether or not >> you'd like to include the person/city in the recommendations you're >> making. >> In this case it seems I'm rather keen on Melbourne, so you might want to >> recommend me to other folks who visit Melbourne a lot. >> >> As for whether it's more efficient than other databases, I suspect it is >> in >> the general case since this is a graph operation which other kinds of >> stores >> will have to reify for themselves (e.g recursive joins, big map/reduce >> job, >> etc). The cost of these kind of operations in Neo4j tends to be very low. >> >> Jim >> >> >> On 18 Jun 2011, at 07:56, faja...@gmail.com wrote: >> >>> Ah this discussion is interesting, I want to join and throw in sonme >>> idea >>> too. >>> >>> If a user can visit a place for multiple times. And if there are 100 >>> user >>> visit USA. So we should suggest top 10 only. >>> >>> Would traversing the graph be more efficient than normal database query? >>> >>> >>> Sent from my BlackBerry® smartphone from Sinyal Bagus XL, Nyambung >>> Teruuusss...! >>> >>> -----Original Message----- >>> From: Aman <aman.6...@gmail.com> >>> Sender: user-boun...@lists.neo4j.org >>> Date: Sat, 18 Jun 2011 10:50:34 >>> To: Neo4j user discussions<user@lists.neo4j.org> >>> Reply-To: Neo4j user discussions <user@lists.neo4j.org> >>> Subject: Re: [Neo4j] Generating suggestions in a Neo4j db >>> >>> Hi Jim, >>> The way you mentioned, that will take care of these suggestions, >>> thanks for the same. But here's a tougher problem.... >>> If I have a database of 50k people, and I want to find friends based >>> upon the places that those 50k people have visited (i.e. People who >>> have visited same places as me should be suggested as friends to me), >>> then how to to that... I've thought all that I could, but I always >>> come up with something stupid... Any suggestions about this? >>> >>> On 6/18/11, Aman <aman.6...@gmail.com> wrote: >>>> Hi Jim, >>>> The way you mentioned, that will take care of these suggestions, >>>> thanks for the same. But here's a tougher problem.... >>>> If I have a database of 50k people, and I want to find friends based >>>> upon the places that those 50k people have visited (i.e. People who >>>> have visited same places as me should be suggested as friends to me), >>>> then how to to that... I've thought all that I could, but I always >>>> come up with something stupid... Any suggestions about this? >>>> >>>> On 6/18/11, Jim Webber <j...@neotechnology.com> wrote: >>>>> Hi Aman, >>>>> >>>>> I'm puzzled. >>>>> >>>>> Why not >>>>> >>>>> Aman--HAS_VISITED-->USA >>>>> Jim--HAS_VISITED-->India >>>>> >>>>> And if: >>>>> >>>>> Aman--FRIEND-OF-->Jim >>>>> >>>>> Then you just need to traverse from Aman following outgoing FRIEND_OF >>>>> relationships to all your friends, and then traverse out their >>>>> outgoing >>>>> HAS_VISITED relationships to find places your friends have been. >>>>> >>>>> The general idiom with Neo4j is use indexes the find your start node >>>>> (e.g. >>>>> the Aman node in the above) then traverse from there. >>>>> >>>>> Jim >>>>> >>>>> _______________________________________________ >>>>> Neo4j mailing list >>>>> User@lists.neo4j.org >>>>> https://lists.neo4j.org/mailman/listinfo/user >>>>> >>>> >>>> >>>> -- >>>> Amandeep >>>> +91-9878483857 >>>> >>> >>> >>> -- >>> Amandeep >>> +91-9878483857 >>> _______________________________________________ >>> 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 >> >> _______________________________________________ >> Neo4j mailing list >> User@lists.neo4j.org >> https://lists.neo4j.org/mailman/listinfo/user >> > > > -- > Amandeep > +91-9878483857 > -- Amandeep +91-9878483857 _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
