graph-databases

I am using Neo4j and trying to find out the advantages of Orient as document-graph db over Neo4j. How does it work in Orientdb to have features of a document database in a graphbdb? is the database in both mode (graph and document) using the same datasource? if so, then is it possible to edit data in documentdb and show it as a graphdb? I worked with Orientdb and it seems that you can have your database either as graphdb or as documentdb, so I don't get the point of having both databases features in one db. I mean you can choose to have a pure documentdb or pure graphdb, but can't be some

I'm trying to learn and use the GAS API to implement a Random Walk over my database, associating every visited vertex to the starting vertex. I'm having some issues understanding how I can manage to do this; I've been reviewing the PATHS, BFS, PR, and other GAS classes as examples, but I'm not quite sure how to start. I think my implementation should extend BaseGASProgram and implement the needed methods. Also, as iterative, the frontier contains all the vertexes of the current iteration. The concept of predecessor is also clear to me. But I don't think that I understand very well the Gather,

I'm trying to understand Neo4j object cache by some investigation into it. My first impression of Object cache come from the slides in this link: http://www.slideshare.net/thobe/an-overview-of-neo4j-internals Specifically the Node/Relationship object in cache should look like slide 9 or 15/42. To verify this, I wrote a simple server script using existing graph database contents. The way I do it is trying to look into the starting virtual address of the node/relationship object using sun.misc.Unsafe. The program for obtaining virtual address is from the following link: How can I get the memory

I'am using graph database (Neo4j) , and I need to make relations between relations , for example : (user1)-[:FOLLOWED]->(user2) I want to allow other users to like this activity (that user1 followed user2) , what's the best implementation for this ? Short answer: You can't create a relation to a relation. How to do? You have to create an activity node in the middle of your relation: (user1)-[:FOLLOWED]->(activity{date:..., blabla:...})-[:ACTIVITY_FOR]->(user2) Then you'll be able to make another user LIKE this activity by creating a relation from user to activity node. Relation names are

I'd like to order returned data by relevance in Neo4j. For my purpose, relevance can be simplified to "Index of the word I'm searching for", where the lower index the higher relevance. Example I have these three nodes: node : { Label: PROD properties : { name: "Bearing replacement Skateboard" } } node : { Label: PROD properties : { name: "Skateboard" } } node : { Label: PROD properties : { name: "L7 Skateboard" } } I want them to be returned with this order: node : { Label: PROD properties : { name: "Skateboard" // name.indexOf("Skateboard") = 0 } } node : { Label: PROD properties : { name:

What is the simplest way to quickly create edges in ArangoDB programmatically? I would like to create relationships between documents based on a common attribute. I'd like to be able to select an attribute, and for every document in collection A, create an edge to every document in collection B that has the same value in an equivalent attribute. For example, if I've imported email messages into a collection and people into another collection, I would like to generate edges between the emails and collections. An email's schema might look like this: { "_key": "subject": "body": "from": "to": }