Hi everyone,
I would have an SQL db for the app besides the graph db.
I have users that I would store as nodes within the graph besides
storing them in SQL as well. Within those nodes I store attributes
like male/female, age or date of birth, etc.
I would have one kind of relationship for
Hi Alberto,
Okay, interesting. You want to calculate some metric between pairs of
users, so it's not a friend-of-a-friend scenario or anything like
that, which would have been great in a graph db. This is just all/some
pairs of random users. That you can do with your SQL db or neo4j or
what ever
Hi there,
I noticed the big update to the JPA implementation for Neo4j at
https://svn.neo4j.org/laboratory/components/neo-persistence/trunk/ .
Avishay, could you spread some light on what is changed and improved,
and the current state of the project?
Cheers,
/peter neubauer
COO and Sales, Neo
Hi,
Is it possible to mark a transaction as being read-only? It's taking a while
for
my transaction to shut down, even though there are no writes to commit.
Thanks,
Tim
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Hello,
I'm trying to build a high availability system with neo4j as explained here:
http://wiki.neo4j.org/content/Online_Backup_HA. In theory everything looks
pretty simple and straightforward... but once I try to run the slave process
I'm getting the following exception:
Throwing away
Hi David,
But then you need to store the result. You can store these metrics as
relationships in neo4j, and then just update them for each user when
you recompute. You can find the user nodes via indexing. Maybe it's
acceptable that some metrics are out of date, so you can just
background
Hi, I have an algorithm running on my little server that is very very slow.
It's a recommendation traversal (for all A and B in the catalog of items:
for each item A, how many customers also purchased another item in the
catalog B). It's processed 90 items in about 8 hours so far! Before I dive
Jeff, when you're doing your traversal/update process, how often do you
commit the transactions?
-Original Message-
From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On
Behalf Of Jeff Klann
Sent: Wednesday, July 28, 2010 11:20 AM
To: Neo4j user discussions
Subject:
Oh, and you DEFINITELY need more RAM!
-Original Message-
From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On
Behalf Of Jeff Klann
Sent: Wednesday, July 28, 2010 11:20 AM
To: Neo4j user discussions
Subject: [Neo4j] Stumped by performance issue in traversal - would
I can't give too much help on this unfortunately, but as far as possibility 1)
goes, my database contains around 8 million nodes, and I traverse them in about
15 seconds for retrievals. It's 2.8GB on disk, and the machine has 4GB of RAM.
I
allocate a 1GB heap to the JDK.
Inserts take a little
One benefit you of Neo4j is that you can get rid of these pesky
background jobs and instead calculate such things on the fly quite
fast, and not needing to store that calculated info at all. Tried it?
2010/7/28, Alberto Perdomo alberto.perd...@gmail.com:
Hi everyone,
I would have an SQL db for
Thank you both for your responses.
- I will get some more RAM tomorrow and give Neo4J another shot. Hopefully
that's a huge factor.
- Tim, I like your algorithm trick! Would save a lot of reading/writing but
would definitely require more memory due to the massive increase in # of
edges.
-
Hi, Jeff.
If you are committing after each item, it definitely will slow down
performance. Start a single transaction, commit when you're all done the
entire traversal, and report back the results. You will still see the
changes you've made prior to committing the transaction, as long as you're
I don't think that's the problem. Here's why...
When I was importing my data, it eventually slowed down to a crawl (though
it was pretty fast at first). Someone pointed out that since I was trying to
do it all in one transaction, it was filling the java heap too much. They
suggested I commit
On Tue, Jul 27, 2010 at 22:29, Craig Taverner cr...@amanzi.com wrote:
Mapping property values to a discrete set, and refering to them using
their 'id' is quite reminiscent of a foreign key
in a relational database.
Yes, with a relational database I would create foreign keys and maybe bitmap
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