If there are any changes, then Oplog entries are copied from PRIMARY to SECONDARY as soon as they are created on the PRIMARY node. The SECONDARY database is querying the PRIMARY database for new changes in the Oplog.Changes saved in the Oplog are sequential-that is, saved in the order that they are received and executed. The PRIMARY database saves data changes in the Oplog. In the preceding model, the PRIMARY database is the only active replica set member that receives write operations from database clients.The following diagram depicts the architecture diagram of a simple replica set cluster with only three server nodes – one primary node and two secondary nodes: Explain the Replication Architecture in MongoDB. and licensed under the Server Side Public License (SSPL).Ģ4. It combines the ability to scale out with features such as secondary indexes, range queries, sorting, aggregations, and geospatial indexes.MongoDB works on the concept of Collection and Document.It provides easy scalability and is a cross-platform, document-oriented database.It uses JSON-like documents with optional schemas. MongoDB is an open-source NoSQL database written in C++ language.To manage huge sets of unstructured data like log or IoT data, a NoSQL database is used. When dealing with data, there are two types of data as we know – (i) structured data and (ii) unstructured data. Structured data is usually stored in a tabular form whereas unstructured data is not. What are some utilities for backup and restore in MongoDB? Explain the concept of pipeline in the MongoDB aggregation framework. What is the Aggregation Framework in MongoDB? MongoDB Intermediate Interview Questions.What are some of the advantages of MongoDB?
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