1 ) Which of the following is/are correct? Select one or more: a. Columns are th

Question

1 ) Which of the following is/are correct? Select one or more: a. Columns are the basic units of distribution and load balancing. b. Tablets are the basic units of access control. c. The choice of row-keys affects partitioning of rows into tablets. d. Columns are grouped into column families, and columns within a column family can be dynamically changed. e. Column families within a (big) table can be dynamically created (i.e., no need to predefine a column family before data is stored under any column key in that family)

2) Which of the following is/are generally considered as being a category of NoSQL databases? Select one or more: a. Key-value data stores b. Document-oriented data stores c. Distributed data stores d. Graph databases e. Object-oriented data stores f. Column-oriented data stores

3) Which of the following is/are a key-value data store? Select one or more: a. Hypertable b. Hbase c. MongoDB d. MemcacheDB e. Dynamo f. Voldemort g. CouchDB

4) Which of the following are correct? Select one or more: a. Eventual consistency ensures that data is eventually consistent in a distributed database system. Thus, no any read-write conflicts and write-write conflicts can occur under eventual consistency. b. Eventual consistency guarantees that, if no additional updates are made to a given data item, all reads to that item will eventually return the same value. c. Eventual consistency does not order concurrent writes as they are executed. d. Under eventual consistency, all servers eventually "converge" to the same state within a specified time period.

Explanation / Answer

1 ) Which of the following is/are correct?
Ans:
a. Columns are the basic units of distribution and load balancing
d. Columns are grouped into column families, and columns within a column family can be dynamically changed.

2)Which of the following is/are generally considered as being a category of NoSQL databases? Select one or more:

Ans:
f. Column-oriented data stores

3)Which of the following is/are a key-value data store?
Ans:
a. Hypertable
c. MongoDB

4) Which of the following are correct?

Ans:
c. Eventual consistency does not order concurrent writes as they are executed.

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