![]() Let us first create a collection with documents − db.demo541. The $pull operator removes from an existing array all instances of a value or values that match a specified condition. Its maintenance of this streamlined design is one of the reasons MongoDB can achieve such high performance.To remove an element, update, and use $pull in MongoDB. For some functionality, the database server offloads processing and logic to the client-side (handled either by the drivers or by a user’s application code). It combines the ability to scale out with features such as secondary indexes, range queries, sorting, aggregations, and geospatial indexes.Īlthough MongoDB is powerful, incorporating many features from relational systems, it is not intended to do everything that a relational database does. MongoDB is a powerful, flexible, and scalable general-purpose database. Chained replication is useful in certain replication topologies, and it is enabled by default in MongoDB. This type of replication is called Chained Replication because it is a two-step replication process. ![]() Sometimes a SECONDARY database can replicate data from another SECONDARY.
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