MongoDB Interview Questions

MongoDB uses a database profiler to perform characteristics of each operation against the database. You can use a profiler to find queries and write operations. In MongoDB, the Profiler is a tool used for collecting data about database operations. It helps developers and administrators analyze the performance of queries and operations performed on the database. … Read more

Yes. Yes, journaling features in MongoDB can be used to perform safe hot backups. Journaling in MongoDB is a feature that ensures the durability of write operations. When journaling is enabled, write operations are first recorded in a write-ahead log (WAL) or journal before being applied to the actual data files. This helps in recovering … Read more

Namespace is a concatenation of the database name and the collection name. Collection, in which MongoDB stores BSON objects. In MongoDB, a namespace refers to a combination of a database name and a collection name. The namespace uniquely identifies a specific collection within a specific database. It follows the format “database_name.collection_name”. For example, if you … Read more

By default, the_id collection is created for every collection by MongoDB. By default, MongoDB creates an _id index for every collection. The _id field is a unique identifier for each document in a collection, and MongoDB automatically creates an index on this field to optimize queries that involve searching for or retrieving documents by their … Read more

In MondoDB, Indexes are used to execute query efficiently. Without indexes, MongoDB must perform a collection scan, i.e. scan every document in a collection, to select those documents that match the query statement. If an appropriate index exists for a query, MongoDB can use the index to limit the number of documents it must inspect. … Read more