Explanation:Document databases pair each key with a complex data structure known as a document. 4. Which of the following is a wide-column store ?
A. Cassandra
B. Riak
C. MongoDB
D. Redis
Answer:A
Explanation:Document databases pair each key with a complex data structure known as a document. 4. Which of the following is a wide-column store ?
A. Cassandra B. Riak C. MongoDB D. Redis
Explanation:Wide-column stores such as Cassandra and HBase are optimized for queries over large datasets, and store columns of data together, instead of rows. 5. Point out the wrong statement :