[Mulgara-dev] 100k models?

[Paul Gearon]

Just to add to this message, you mentioned triples/quads.  The "quads" used
by Mulgara are actually an RDF triple, along with the model.  We index on
all four elements equally.  Indeed, from a file storage and indexing point
of view, there is NO difference between how we treat the subject, predicate,
object or model of any one statement.

The only difference is in our query language, TQL.  In our case, subject,
predicate and object are all determined by position in a constraint, while
the model is determined by an "IN" expression.  If there is no "IN"
expression on a constraint, then it will default to whatever the FROM
expression for the whole query is, but you may not use variables in the FROM
expression.  (FROM is like a shorthand that lets you write shorter
constraints in the WHERE clause).

Paul

On 4/5/07, David Wood <dwood at softwarememetics.com> wrote:
>
> Hi Laurian,
> Mulgara scales well in terms of model numbers.  We have seen people try it
> with hundreds of thousands of models and get decent performance.
>
> However, Jena+Mulgara is *not* recommended.  May I ask what you are trying
> to accomplish?  Perhaps we could recommend a different approach.
>
> Regards,
> Dave
>
> --
> http://prototypo.blogspot.com
>
>
> On 5 Apr2007, at 05:59, Laurian Gridinoc wrote:
>
> Hello,
>
> I would like to know how Mulgara scales at model number, not just at
> triple/quad storage.
>
> We are using in Watson project [1] for the moment Jena with MySQL and our
> current model set is about 7000, which means that we have in Jena DB 14000
> tables, even we can store more models in one table it seems unfeasible in
> long run.
>
> We would like to try Jena+Mulgara for our next crawl, which will yield
> more than 100,000 models, how does Mulgara scale in this aspect?
>
> [1] http://watson.kmi.open.ac.uk/
>
> Thank you,
> --
> Laurian Gridinoc
> PhD Student
> Knowledge Media Institute
> The Open University
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