Imagine a social network app. Users follow other users and users take photos. Photos have tags of other users. I'm trying to get an effective Cosmos db implementation of a graph for that app. I pr...

I'm trying to use the gremlin npm module and connect to a Neptune database. During testing, I tried having gremlin connect to an inactive endpoint and invalid url to make the system more resilient....

Creating a named graph from the main Neo4j Graph is documented. Beside, one also knows how to list, drop, check if a named graph already exists, e.g. CALL gds.graph.exists('my-store-graph') YIELD e...

I had worked on relational database; but now want to learn about graph database. I came to know that these two are graph database. What is difference between these two databases. What should we pre...

I have created a neptune instance in aws. How can I connect to it now? I tried the the example given in the documentation locally from my laptop. from gremlin_python.structure.graph import Graph ...

I wanted to model partner relationship like the following, which I expressed in the format of labeled property graph. I wanted to use RDF language to express the above graph, particularly I want...

I have a use case where I need to classify people's trajectories within a big room. In terms of performance and best Neo4j practices, what option would be better if I want to classify this data to...

Which is the graph database that supports limitless scale out, handles large volumes of data, and can perform low-latency queries? Preferably one that integrates well with Hadoop. I have been...

I would like to create multiple disconnected nodes using a single cypher query The documentation says: Create multiple nodes with a parameter for their properties. By providing Cypher an array...

Using tinkerpop blueprints API, what is the best way to find if an edge exists between two vertices? I would like to avoid vertex.getEdges() and iterate until find the right one. E.g.: Check if v1...

I downloaded 2 versions of neo4j on Ubuntu 18.04 which are "neo4j-community-3.5.12" and "neo4j-community-3.5.8" I run 3.5.8 with default settings I can see it from the web. http://localhost:7474/ ...

g.v(1).id gives me vertex 1 id, g.v(1).map gives me vertex 1 properties. But, how can I get a hash with id and propeties at the same time

Recently I have been looking into graph databases like Neo4j and into logic programming in Prolog and miniKanren. From what I have learned so far, both allow specifying facts and relations between ...

I'm starting to develop with Neo4j using the REST API. I saw that there are two options for performing complex queries - Cypher (Neo4j's query language) and Gremlin (the general purpose graph query...

I know that there are similar questions around on Stackoverflow but I don't feel they answer the following. Graph Databases to my understanding store data following mostly this schema: Table/Coll...

Assume I'm working with the graph database from this sample (SQL Server 2017): https://learn.microsoft.com/en-us/sql/relational-databases/graphs/sql-graph-sample I have the following SQL query: ...

I have been dealing with Neo4j through python's Bulbflow and now need a way to save/export subgraphs. I have seen Java and even Ruby approaches for doing this, however a simple Python approach seem...

I'm trying to create (action)->(state) pair in such a way so that if : the action exists, use it, instead of creating new one the state exists, use it, instead of creating new one and do it in ...

In Cypher in Neo4J, given two nodes, if there's no relationship between them, I'd like to create a relationship (of type Foo) with a weight property of one. If this relationship already exists, I'd...

I've found some advice for setting up tagging systems in relational and document databases, but nothing for graph/multi-model databases. I am trying to set up a tagging system for documents (let's...

I know how to remove a vertex by id in Gremlin. But now I'm need to cleanup the database. How do I delete multiple vertices? Deleting 1 v is like this: ver = g.v(1) g.removeVertex(ver) I mean so...

I am following this blog: https://developer.ibm.com/dwblog/2018/janusgraph-composite-mixed-indexes-traversals/ code: gremlin> graph.tx().rollback() ==>null gremlin> mgmt = graph.openMana...

How would one go about storing and querying sparse directed or undirected graphs in Postgresql. There is something like pggraph, but that is still in planning stage. I realize dedicated grap...

I am trying to create a huge database in neo4j which will have around 2 million nodes and around 4 million edges. I have been able to speed up the node creation process by creating the node in the ...

I'm starting to dig into graph databases, but i have no idea, how these graphs are stored internally. Let's say i have this graph (taken from Wikipedia): How do i serialize this graph as a key-v...