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?
