Discussion
Which of the following is a wide column store ?
Answer: A
The wide column store is Cassandra.
Apache Cassandra organises data in tables of rows whose columns can vary from row to row, grouped into column families, the wide-column model it took from Google's Bigtable along with the distributed design of Amazon's Dynamo.
Riak is a distributed key-value store. MongoDB (printed 'Mango DB') is a document store holding JSON-like documents. Redis is an in-memory key-value store with rich data structures. None of them is a wide column store.
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