MongoDB is a NoSQL document database that stores data in flexible JSON-like documents, providing scalability, performance, and easy development with dynamic schemas.

What is a document in MongoDB?

A document in MongoDB is a record stored as a BSON object, similar to JSON, containing field-value pairs. It's the basic unit of data in MongoDB collections.

What is aggregation in MongoDB?

Aggregation is a framework in MongoDB for processing and transforming documents through a pipeline of stages like match, group, project, and sort for complex data analysis.

Mongo DB Interview Questions

121. How does WiredTiger manage memory internally?

122. What are cache eviction strategies in WiredTiger?

123. How does compression work in MongoDB storage engines?

124. What are the tradeoffs between snappy, zlib, and zstd compression?

125. How does MongoDB handle document updates internally?

126. What are document moves and fragmentation issues?

127. How do large documents affect storage efficiency?

128. What are padding factors in MongoDB?

129. How does journaling support durability guarantees?

130. How does checkpointing work in WiredTiger?