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.
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Practice Test
121. What is the primary purpose of transactions in MongoDB?
A. Data modeling
B. Data storage
C. Data consistency
D. Data encryption
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Answer: Data consistency
122. Which MongoDB version introduced support for multi-document transactions?
A. MongoDB 2.4
B. MongoDB 3.0
C. MongoDB 4.0
D. MongoDB 4.2
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Answer: MongoDB 4.2
123. What is the benefit of using transactions in MongoDB?
A. Improved data modeling
B. Enhanced data storage
C. Ensured data consistency
D. Simplified data retrieval
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Answer: Ensured data consistency
124. In MongoDB, what is a "write concern" for a transaction?
A. A way to specify transaction duration
B. A timeout setting
C. A mechanism for enabling multi-document transactions
D. A level of transaction data durability
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Answer: A level of transaction data durability
125. What is the MongoDB method used to start a new session for a transaction?
A. db.startSession()
B. db.beginTransaction()
C. db.createTransaction()
D. db.newSession()
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Answer: db.startSession()
126. What is a "document identifier" in the context of MongoDB transactions?
A. A field in a document
B. A transaction ID
C. A unique identifier for a document
D. A session identifier
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Answer: A unique identifier for a document
127. What is the primary purpose of a "read concern" in MongoDB transactions?
A. Specifying transaction duration
B. Defining the transaction's read isolation level
C. Enabling multi-document transactions
D. Specifying the write concern level
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Answer: Defining the transaction's read isolation level
128. How is a "write concern" specified when starting a transaction in MongoDB?
A. In the transaction options
B. As a parameter in the session
C. As an option when defining the transaction
D. As a separate transaction command
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Answer: In the transaction options
129. What does a "session" in MongoDB represent in the context of transactions?
A. A transaction duration
B. A unit of data storage
C. A user session
D. A set of operations within a transaction
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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?
A. After every operation
B. At the end of the transaction
C. Only if there's an error
D. Before the transaction starts
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Answer: At the end of the transaction
