Misunderstanding cardinality issues ?
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
> > 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
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