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What is exactly the difference between Casandra and a document store like CouchDB? Or are they similar?

Just trying to get my head around this nosql thing and the different approaches...

CouchDB is an MVCC document store, it isn't concerned with scaling the way Cassandra, HBase and Voldemort are. This is a pretty good overview of the landscape http://www.vineetgupta.com/2010/01/nosql-databases-part-1-la...