240+ MongoDB MCQ With Online Practice Test

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MongoDB is a popular NoSQL database system renowned for its flexibility and scalability. It uses a document-oriented model, storing data in JSON-like BSON format, allowing for dynamic schemas and easy data manipulation. MongoDB's distributed architecture supports horizontal scaling, ensuring high availability and performance. It's widely utilized for applications requiring real-time data access and complex data structures. Its features include automatic sharding, replication, and support for geospatial data, making it a versatile choice for a broad range of industries, from e-commerce and social media to IoT and big data analytics.

121. What is the primary purpose of transactions in MongoDB?

Answer: Data consistency

122. Which MongoDB version introduced support for multi-document transactions?

Answer: MongoDB 4.2

123. What is the benefit of using transactions in MongoDB?

Answer: Ensured data consistency

124. In MongoDB, what is a "write concern" for a transaction?

Answer: A level of transaction data durability

125. What is the MongoDB method used to start a new session for a transaction?

Answer: db.startSession()

126. What is a "document identifier" in the context of MongoDB transactions?

Answer: A unique identifier for a document

127. What is the primary purpose of a "read concern" in MongoDB transactions?

Answer: Defining the transaction's read isolation level

128. How is a "write concern" specified when starting a transaction in MongoDB?

Answer: In the transaction options

129. What does a "session" in MongoDB represent in the context of transactions?

Answer: A set of operations within a transaction

130. In a multi-document transaction, when should you explicitly commit or abort the transaction in MongoDB?

Answer: At the end of the transaction
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