Misunderstanding cardinality issues ?

Adrien Mogenet adrien.mogenet at gmail.com
Wed Apr 18 16:28:43 EDT 2012


On Wed, Apr 18, 2012 at 10:09 PM, John E. Vincent <lusis.org+
riak-users at gmail.com> wrote:

> On Wed, Apr 18, 2012 at 3:42 PM, Adrien Mogenet
> <adrien.mogenet at gmail.com> wrote:
> > Hi there,
> >
> > From this Riak Search's
> > page (http://wiki.basho.com/MapReduce-Search-2i-Comparison.html) :
> >
> > Poor Use Case:
> >
> > Searching for common (low cardinality) terms in documents
> >
> > I agree that searching for common terms in Riak Search is a really poor
> use
> > case (and not only in RS), but shouldn't we speak about "high
> cardinality" ?
> >
> > As far as I know, cardinality is a mathematical concept that defines the
> > "size" of a set. Did I misunderstand it ?
> >
> > By the way, what is a "great cardinality" according to Riak Search ? 10 ?
> > 100 ? 1000 ? ...
> >
>
> In database terms it's not the SIZE so much as the count of distinct
> values.  Does that help? As far as "great cardinality", I have no idea
> off hand what that would be.
>
> My mistake. I think I misunderstood the notion of "Term". I thought that
we were talking about the cardinality of the set of documents linked to a
"term value", and not about the set of values of a single Term.

Thanks for your clarifying that point :)


> >
> > --
> > Adrien
> >
> >
> > _______________________________________________
> > riak-users mailing list
> > riak-users at lists.basho.com
> > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
> >
>



-- 
Adrien Mogenet
06.59.16.64.22
http://fr.flavors.me/adrienm
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.basho.com/pipermail/riak-users_lists.basho.com/attachments/20120418/65cd6320/attachment.html>


More information about the riak-users mailing list