> Seems reasonable, but what is a CAP database?

Database based around the CAP theorem[1].  Cassandra, Dynamo,
Hypertable, etc.

For us, the equation is: CAD, as in Consistency, Availability,
Durability.  Pick any two, at best.  But it's a very similar bag of
issues as the ones CAP addresses.

[1]http://www.julianbrowne.com/article/viewer/brewers-cap-theorem

-- 
                                  -- Josh Berkus
                                     PostgreSQL Experts Inc.
                                     http://www.pgexperts.com

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