MongoDB
MongoDB is an open-source document-oriented database program. Classified as a NoSQL database program, it uses the JSON-like documents with schemas.

It supports the field, range queries and regular expression searches. This can turn specific fields of the documents and includes user-defined JavaScript functions. Queries are configured to return a random sample of results of a given size.

It provides the high availability. It has the replica set and each replica set acts in the role of primary or secondary replica at any time. All the write and read are executed on the primary replica by default. Secondary replicas maintains the copy of the data of the primary one using the built-in replication. Secondaries becomes active when primary fails, can optionally serve the read operations, but that data is only eventually consistent by default.

MongoDB can be used as the file system with load balancing and data replication features over multiple machines for storing files.This function which is called the grid file system is included with MongoDB drivers. MongoDB exposes functions for the file manipulation and content to developers. It supports the fixed-size collections which is  called capped collections. The type of collection maintains insertion order and, once the specified size has been reached it behaves like the circular queue.
MongoDB has many benefits which are:
  • Index is there on any attribute
  • Replication and high availability
  • Rich queries
  • Fast in-place updates
  • Professional support by MongoDB
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