Misunderstanding cardinality issues ?

John E. Vincent lusis.org+riak-users at gmail.com
Wed Apr 18 16:09:33 EDT 2012


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.

>
> --
> Adrien
>
>
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