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.

71. What is the primary purpose of sharding in MongoDB?

Answer: Horizontal scalability

72. What does a "shard" represent in MongoDB sharding?

Answer: A physical server

73. How is data distributed across multiple shards in MongoDB?

Answer: By partitioning data based on the _id field

74. In MongoDB sharding, what is the role of the "mongos" process?

Answer: Query routing and distribution

75. Which shard key strategy in MongoDB ensures that data is evenly distributed across shards?

Answer: Hashed Shard Key

76. In MongoDB sharding, what is the purpose of a "config server"?

Answer: Query routing

77. What happens when a shard in MongoDB becomes unavailable?

Answer: Data is frozen until the shard is repaired

78. Which MongoDB sharding strategy is suitable for time-series data?

Answer: Range-based Shard Key

79. What is the primary goal of sharding key selection in MongoDB?

Answer: To minimize data distribution

80. In MongoDB, what is the role of a "balancer"?

Answer: Data distribution
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