Question 1 (1 mark)

Which statement is NOT true about NoSQL databases?

(a)	MongoDB is an example of NoSQL databases
(b)	Document-based databases support data schema and constraints similarly to RDBMS
(c)	NoSQL databases tend to produce high read/write throughputs because the ACID properties are not strictly followed
(d)	NoSQL refers to a range of non-relational data models

Question 2 (1 mark)

Which statement is NOT correct about Graph Models?

(a)	They are suitable when there are many Many to Many relationships between entities
(b)	In this model, entities are represented by nodes, and edges represent relationships
(c)	Every node in a graph database represents the same type of entities.
(d)	Nodes in the graph can have attributes/properties.

Question 3 (1 mark)

Which data model does the following paragraph refer to?

It is flexible in that the author of the model can freely choose markups that describe the content of the document. The model can also optionally have a formally defined schema to restrict data types and enforce integrity.

(a)	Document based model
(b)	Relational data model
(c)	Graph based model
(d)	XML

Question 4 (1 mark)

Which of one of the following is incorrect of document based data models?

(a)	Can effectively capture one-many type relationships (e.g., a user has many job titles)
(b)	Can improve locality of the information relevant to an entity (e.g., a user's resume represented as a single document)
(c)	Can effectively link other external documents to represent many-to-many relationships
(d)	Can be implemented in a relational database with extended support (e.g., PostgreSQL has an extension for JSON types)

Question 5 (1 mark)

Which one of the following is correct of the fan-out effect?

(a)	It refers to the average peak load of a relational database system
(b)	It refers to a typical social network scenario where a small portion of write operations can result in a large number of of read/write operations
(c)	It refers to a typical graph data model where a single entity can be linked to many different types of entities