NoSQL DB Exam Questions With Verified
And Updated Answers
What are the 4 NoSQL Data models - answer✔Key-value, graph database, document-oriented,
and column family
What is the CAP Theorem - answer✔CAP stands for Consistency, Availability, Partition
Tolerance. CAP theorem states only 2 of these 3 concepts can be achieved simultaneously, not
all 3.
Big Data can be understood through the 3 V's, what are they - answer✔Volume, variety,
velocity
What are 5 ways NoSQL differs from RDB - answer✔1. looser schema definition
2. Applications written to deal with specific documents, objects, or data from the DB
3. Designed to handle distributed, large DBs
4. No strong support for ad hoc queries but designed for speed and growth of DB(query
language through APIs)
5. Relaxation of the ACID properties
What does sharding do - answer✔distributes a single logical data collection across a cluster of
machines, the data is partitioned horizontally
What is a Shard - answer✔The collection of data objects on a specific DB server
Hot spots can be addressed by - answer✔sharding
What can redundancy do for replica sets - answer✔create multiple paths to the same object
Failover - answer✔provides resilience in the face of a network partition; can switch all data
requests to another node when a node fails
What are the 2 consistencies in a Master-Slave replication - answer✔1. Strong Consistency: all
copies are updated synchronously
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