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Mongo is a consistent partition-tolerant database. All users should always get the same data back from MongoDB regardless of when they read it. Documents are partitioned using sharding. Each partition will have a subset of the documents. Shards are created based on the key you choose. This allows you to customize how Mongo partitions the database. MongoDB is structured around databases, collections, and records. A single database is intended for a single application. Collections are then used to organize records that are similar to each other.
While MongoDB is a document database with some things in common with CouchDB, it ultimately differs in the way you connect, the way it partitions data, and the way you run queries.
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