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Re: rdf.rb/spira bulk read question

From: Greg Lappen <greg@lapcominc.com>
Date: Wed, 2 Mar 2011 10:39:32 -0500
Message-ID: <AANLkTi=TgSB0GZ4DGNoNnfHFwi8X-tEi9JKc3vBP_mxt@mail.gmail.com>
To: Gabor Ratky <gabor@secretsaucepartners.com>
Cc: public-rdf-ruby@w3.org
And to answer your other question, we chose CouchDB as a hard dependency due
to its replication functionality.  We may still end up using a triple store
with SPARQL support (as Ben suggested) in conjunction with it if necessary.

On Wed, Mar 2, 2011 at 10:37 AM, Greg Lappen <greg@lapcominc.com> wrote:

> Yes, not only am I using ipublic/rdf-couchdb, I WROTE it!  I'm pleasantly
> surprised to find that someone else has tried to use it, ha!
> I'd love input on how to make the implementation less naive...I have
> implemented the query_pattern method to use couchdb views instead of
> iterating over the entire repo, but is there more to it?  I think the
> looping behavior on the graph queries is a consequence of the graph query
> implementation, not the backend, right?
> On Wed, Mar 2, 2011 at 10:31 AM, Gabor Ratky <
> gabor@secretsaucepartners.com> wrote:
>> Are you using Dan Thomas' rdf-couchdb project? (
>> https://github.com/ipublic/rdf-couchdb) I've found the project a naive
>> RDF::Repository implementation on top of CouchDB in many ways. Great proof
>> of concept with rdf-spec tests passing, but definitely needs work,
>> especially in the 'efficient querying' space, IMHO.
>> Are you taking a hard dependency on CouchDB in other parts of your
>> architecture (like us), or just chose it as an RDF repository?
>> Gabor
>> On Mar 2, 2011, at 3:20 PM, Greg Lappen wrote:
>> Hi all,
>> We are making good progress with our project, and I've gotten to the point
>> where I am storing datasets in our rdf repository (rdf.rb based, implemented
>> on couchdb).  Now I'm building a page that allows the data to be exported in
>> various formats (xml, csv, etc), but when I iterate over all of the data, it
>> is extremely slow.  I see Spira querying the repository once for each
>> instance when I iterate using the model's "each" method.  I understand why,
>> I'm just wondering if there's a faster way to query all of the instances of
>> a Spira class.  One thought we had was to use a graph query instead, which
>> would pull out all the properties in N queries (where N is the number of
>> properties in the class).  In the example I'm trying, this would be 23
>> queries, which is better than hundreds or thousands of queries. Is this as
>> good as it gets?  I'm accustomed to working with RDBMS and ActiveRecord, so
>> I may just have to shift my expectations a bit, but thought I would ask the
>> group if there's something I'm missing....thanks as always,
>> Greg
Received on Wednesday, 2 March 2011 15:40:25 UTC

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