This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “NoSQL Databases”.
1. Which of the following is not a NoSQL database?
a) SQL Server
b) MongoDB
c) Cassandra
d) None of the mentioned
View Answer
Explanation: Microsoft SQL Server is a relational database management system developed by Microsoft.
2. Point out the correct statement.
a) Documents can contain many different key-value pairs, or key-array pairs, or even nested documents
b) MongoDB has official drivers for a variety of popular programming languages and development environments
c) When compared to relational databases, NoSQL databases are more scalable and provide superior performance
d) All of the mentioned
View Answer
Explanation: There are also a large number of unofficial or community-supported drivers for other programming languages and frameworks.
3. Which of the following is a NoSQL Database Type?
a) SQL
b) Document databases
c) JSON
d) All of the mentioned
View Answer
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
View Answer
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.
a) Non Relational databases require that schemas be defined before you can add data
b) NoSQL databases are built to allow the insertion of data without a predefined schema
c) NewSQL databases are built to allow the insertion of data without a predefined schema
d) All of the mentioned
View Answer
Explanation: There’s also no way, using a relational database, to effectively address data that’s completely unstructured or unknown in advance.
6. “Sharding” a database across many server instances can be achieved with _______________
a) LAN
b) SAN
c) MAN
d) All of the mentioned
View Answer
Explanation: “Sharding” a database across many server instances can be achieved with SQL databases, but usually is accomplished through SANs and other complex arrangements for making hardware act as a single server.
7. Most NoSQL databases support automatic __________ meaning that you get high availability and disaster recovery.
a) processing
b) scalability
c) replication
d) all of the mentioned
View Answer
Explanation: The storage environment is essentially virtualized from the developer’s perspective.
8. Which of the following are the simplest NoSQL databases?
a) Key-value
b) Wide-column
c) Document
d) All of the mentioned
View Answer
Explanation: Every single item in the database is stored as an attribute name (or “key”), together with its value in Key-value stores.
9. ________ stores are used to store information about networks, such as social connections.
a) Key-value
b) Wide-column
c) Document
d) Graph
View Answer
Explanation: Graph stores include Neo4J and HyperGraphDB.
10. NoSQL databases is used mainly for handling large volumes of ______________ data.
a) unstructured
b) structured
c) semi-structured
d) all of the mentioned
View Answer
Explanation: MongoDB is an a typical choice for unstructured data storage.
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