What is MongoDB?
MongoDB is an open source, document-oriented database designed with both scalability and developer agility in mind. Instead of storing your data in tables and rows as you would with a relational database, in MongoDB you store JSON-like documents with dynamic schemas.
Developers access documents through rich, idiomatic drivers available in all popular programming languages. Documents map naturally to the objects in modern languages, which allows developers to be extremely productive. Typically, there’s no need for an ORM layer.
MongoDB provides auto-sharding for horizontal scale out. Native replication and automatic leader election supports high availability across racks and data centers. And MongoDB makes extensive use of RAM, providing in-memory speed and on-disk capacity.
Unlike most NoSQL databases, MongoDB provides comprehensive secondary indexes, including geospatial and text search, as well as extensive security and aggregation capabilities. MongoDB provides the features you need to develop the majority of the new applications your organization develops today.
With the launch of 3.0, MongoDB offers a pluggable storage engine API, with multiple storage engines already available. Select your storage engine based on your application requirements, and even mix storage engines within a replica set. MongoDB now provides 7x to 10x better write throughput, up to 80% compression, and 95% reduction in operational overhead