About Michael Hunger

Posts by Michael Hunger:

 
2

LOAD CSV with SUCCESS

on Oct 18, 2014 in cypher, import, neo4j

I have to admit that using our LOAD CSV facility is trickier than you and I would expect.
Several people ran into issues that they could not solve on their own.

My first blog post on LOAD CSV is still valid in it own right, and contains important aspects that I won’t repeat here.
Both in terms of data quality checking (broken CSV files, misspelt header names or incorrect data types) as well as the concern of transaction size, where PERIODIC COMMIT comes to the rescue.

To address the most frequent issues and questions, I decided to write this follow up post.

In general you might have better experience using Neo4j-Enterprise as it contains some components which are more memory efficient.

If you want to import much more than 10-15 million lines of data, you might consider using our non-transactional batch-insertion facilities:

(more…)

 
2

Flexible Neo4j Batch Import with Groovy

on Oct 9, 2014 in import, neo4j

You might have data as CSV files to create nodes and relationships from in your Neo4j Graph Database.
It might be a lot of data, like many tens of million lines.
Too much for LOAD CSV to handle transactionally.

Usually you can just fire up my batch-importer and prepare node and relationship files that adhere to its input [...]

 
7

LOAD CSV into Neo4j quickly and successfully

on Jun 25, 2014 in cypher, import

Note

You can also read an interactive and live version of this blog post as a Neo4j GraphGist.

Since version 2.1 Neo4j provides out-of-the box support for CSV ingestion. The LOAD CSV command that was added to the Cypher Query language is a versatile and powerful ETL tool.
It allows you to ingest CSV data from any URL [...]

 
2

Rendering a Neo4j Database in UbiGraph

on Jun 23, 2014 in cypher, server

I never heard of UbiGraph before, but this tweet by @a61dr41n made me curious.

#ubigraph is an excellent #visualisation package for #neo4j and other #GraphDB can't believe I haven't heard of it sooner…
— a61dr41n (@a61dr41n) June 20, 2014

So I checked it out. UbiGraph is a graph rendering server that is controlled remotely and also interactively with [...]

 
0

Presentation: “Using AsciiArt to Analyse your SourceCode with Neo4j and OSS Tools” at GeekOut.ee 2014

on Jun 15, 2014 in conference, neo4j, programming languages

During the awesome GeekOut conference organized by my friends at ZeroTurnaround I was asked to stand in for Tim Fox who couldn’t come.

So instead of using a existing presentation I decided to finally write one up over night that covers one aspect of graph databases that is close to my heart:
Software Analytics with Graphs
When I [...]

 
0

Styling Neo4j Server Visualisation

on Jun 3, 2014 in neo4j, server

Styling Neo4j Server Visualisation

To give you a head start when using Neo4j-Browser I wanted to share these quick tips for styling and querying.

 
5

Using LOAD CSV to import Git History into Neo4j

on Jun 1, 2014 in cypher, neo4j

In this blog post, I want to show the power of LOAD CSV, which is much more than just a simple data ingestion clause for Neo4j’s Cypher.
I want to demonstrate how easy it is to use by importing a project’s git commit history into Neo4j. For demonstration purposes, I use Neo4j’s repository on GitHub, which [...]

 
1

Importing Forests into Neo4j

on Apr 10, 2014 in cypher, neo4j

Sometimes you don’t see the forest for the trees. But if you do, you probably use a graph database.

Trees are one of the simple graph datastructures, directed acyclic graphs (DAGs).

For our example we use a time-tree that we want to import into the database.

Data Volume

A quick soulver script (thanks Mark) later, we know how [...]

 
1

Sampling A Neo4j Database

on Mar 25, 2014 in cypher, neo4j

After reading the interesting blog post of my colleague Rik van Bruggen on “Media, Politics and Graphs” I thought it would be really cool to render it as a GrapGist. Especially, as he already shared all the queries as a GitHub Gist.

Unfortunately the dataset was a bit large for a sensible GraphGist representation, so I [...]

 
6

Quickly create a 100k Neo4j graph data model with Cypher only

on Mar 21, 2014 in cypher, neo4j

We want to run some test queries on an existing graph model but have no sample data at hand and also no input files (CSV,GraphML) that would provide it.

Why not create quickly it on our own just using cypher. First I thought about using Cypher to generate CSV files and loading them back, but it [...]

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