Database specialized in storing directed graphs?
clp at rebertia.com
Tue Oct 28 10:02:02 CET 2008
On Mon, Oct 27, 2008 at 5:32 PM, Carl Banks <pavlovevidence at gmail.com> wrote:
> I was wondering if anyone had any advice on this.
> This is not to study graph theory; I'm using the graph to represent a
> problem domain. The graphs could be arbitrarily large, and could
> easily have millions of nodes, and most nodes have a substantial
> amount of data associated with them. Obviously I don't want a whole
> such graph in memory at once, so libraries the just deal with in-
> memory graphs are out.
> I know I could implement this with a relational DB, and I'd be fine
> with a library that was built on top of one. But I'm hoping for
> specialzed behavior useful for graphs.
> For example, suppose I have a set of nodes called A. It would be
> useful to know if any of these nodes are connected by paths that
> include no nodes in A. I could, of course, do that by reading from
> the database and following the paths, but I clearly don't want to do
> that. I would want instead to somehow cache the outside connectedness
> relationship between different nodes of A. But then what happens if
> something changes elsewhere. How is the cache for A notified, and can
> it be updated efficiently using graph theorems, rather than
> It's very tricky; that's why I hope someone else has done it.
> I'm guessing no.
By sacrificing a goat at the altar of the Almighty Google, I was able
to locate a project I came upon a long while ago but couldn't remember
the name of that's vaguely like what you want, in that it's a "graph
database": Neo4j - http://neo4j.org/ (and yes, it's in Java; sigh)
Not sure it's exactly what you're looking for, but anyway....
Follow the path of the Iguana...
> Carl Banks
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