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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(schema-free, schema less).

Using BSON (binary JSON), developers can easily map to modern object-oriented languages without a complicated ORM layer.

BSON is a binary format in which zero or more key/value pairs are stored as a single entity.

lightweight, traversable, efficientbridge the gap between key-value stores

(which are fast and scalable) and relational databases (which have rich functionality).

Data Model for MongoDB?

ReplicationOnly one server is active for writes (the

primary, or master) at a given time – this is to allow strong consistent (atomic) operations. One can optionally send read operations to the secondary's when eventual consistency semantics are acceptable.

ReplicationReplica Sets and Master-Slave replica sets are a functional superset of

master/slave and are handled by much newer, more robust code.

ShardingThe set of servers/mongod process within

the shard comprise a replica set.

ShardingSharding is the partitioning of data among

multiple machines in an order-preserving manner.

Machine 1 Machine 2 Machine 3

Alabama → Arizona Colorado → Florida Arkansas → California

Indiana → Kansas Idaho → Illinois Georgia → Hawaii

Maryland → Michigan Kentucky → Maine Minnesota → Missouri

Montana → Montana Nebraska → New Jersey Ohio → Pennsylvania

New Mexico → North Dakota Rhode Island → South Dakota Tennessee → Utah

  Vermont → West Virgina Wisconsin → Wyoming

Languages :The languages that are supported by MongoDB are :

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