Neo4j

mark3 · 05-17-2020

I am trying to run a query against a Neo4j database from an AWS Lambda function. The Lambda appears to get a driver and session OK, but then freezes waiting for the transaction to start. Eventually the Lambda times out and returns a failure. I have t...

mark3 · 11-26-2019

Hi All, I'm Mark and I've been playing with Neo4j for about four years now. It's the most exciting DB technology I think I've every seen - and I've seen a lot! When I started my computing career we were still using punched cards, paper tape, teletype...

mark3 · 07-17-2020

I think I would be more inclined to write a custom browser guide than try to run queries from the url (which I'm not entirely sure is possible). With a custom browser guide you can include documentation for the users along with hints and tips as well...

mark3 · 05-20-2020

Hi, You can certainly configure nodes so that they must contain a particular property. This is done by adding a constraint, e.g. CREATE CONSTRAINT node_exists ON (p:Person) ASSERT exists(p.surname) This will ensure :Person always has a surname, but...

mark3 · 05-19-2020

Off the top of my head, you could try: MATCH(i1:Institution)<-[:AFFILIATED_WITH]-(a1:Author)-[:AUTHORED]->(p:Publication)<-[AUTHORED]-(a2:Author)-[:AFFILIATED_WITH]->(i2:Institution) WHERE id(i1) <> id(i2) RETURN i1, i2, p, a1, a2 The WHERE will en...

mark3 · 05-19-2020

I think this looks like a memory problem too, but in the Browser rather than the server. You are displaying 3,700 relationships with your cut down data. Rendering thousands of relationships, or nodes, in the Neo4j browser can cause it to become very ...

mark3 · 05-19-2020

Hi David, Thanks for getting back to me with these pointers. I've not had time yet to look at the driver connection parameters, but will do ASAP. I had the lambda set up to preserve the connection between calls (as far as you can in a lambda) and tha...

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Transaction not starting in AWS Lambda

Mark J - Hello Everyone

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