MongoDB Interview Questions

MongoDB doesn’t follow file system fragmentation and pre allocates data files to reserve space while setting up the server. That’s why MongoDB data files are large in size. MongoDB data files can be large for several reasons: Document-oriented Storage: MongoDB is a NoSQL database that stores data in a flexible, JSON-like format known as BSON … Read more

Yes. If you remove a document from database, MongoDB will remove it from disk too. When you remove a document from a MongoDB database, MongoDB marks the space occupied by the document as free and available for reuse within the database. However, MongoDB does not immediately remove the document data from the disk. Instead, the … Read more

MongoDB uses BSON to represent document structures. In MongoDB, the document structure is represented in BSON (Binary JSON) format. BSON is a binary-encoded serialization of JSON-like documents and serves as the primary data interchange format used by MongoDB. It extends the JSON model to provide additional data types and to be efficient for encoding and … Read more

MongoDB supports following CRUD operations: Create Read Update Delete In MongoDB, CRUD stands for Create, Read, Update, and Delete. These are the basic operations that can be performed on the documents in a MongoDB database. Create (C): This operation involves the insertion of new documents into a MongoDB collection. In MongoDB, a document is a … Read more

By default, MongoDB writes data only to the primary replica set. In MongoDB, the default behavior is to write data to the primary replica set member. In a replica set, there is one primary node that accepts all write operations, and the data is then replicated to the secondary nodes for high availability and fault … Read more