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    Most popular nosql database 2016

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    What is NoSQL Database?

    NoSQL Database Types

    There are main four types of NoSQL databases.

     

    Key-value stores

    Key value
    Key value

    • The simplest type of NoSQL database.
    • Uses in hash table.
    • Unique key as pointer to a value
    • Logical grouping of keys are called a “bucket
    • Large fallbacks with running queries.
    • Most don’t support update operations that modify only part of the data

    Document Databases

    Document Databases
    Document Databases

    • Uses key value pairs compressed as a document store similar to a key- value store, but values stored (“documents”) provide some structure& encoding of the managed data.
    • Can use multiple formats with  document databases- JSON, XMLBSON
    • Can perform nested queries & can do much more with your data when compared to a key-value store.
    • MongoDB and Couchbase are the most popular document databases at this time

    Graph stores

    Graph base
    Graph base

    • Based on “graph theory
    • Use a flexible graphical representation as oppose to rigid tables & columns
    • Uses “edges” & “nodes” instead of key-value pairs. This creates an index-free adjacency
    • Often used to store information about networks, such as social connections
    • Compared to RDBMS, graph databases are usually faster for associative data sets and map more directly to the structure of object- orients applications

    Column-Family stores

    Column Family
    Column Family

    • Data is stored in cells that are grouped in columns of data rather than as rows of data
    • Columns are grouped logically into Column families
    • Column families can contain a virtually unlimited number of columns that can be created at runtime or the definition of the schema
    • These are generally for storing & processing very large amounts of data that is distributed across many machines.
    • Faster Access, search & data aggregation

    Top most NoSQL databases

    Apache Cassandra

    It is distributed, High performance, extremely scalable and fault tolerant post-relational Database solution. It can serve as both real-time data stores for online or transactional applications, and as a read intensive database for business intelligence systems.

    Features

    • Gigabyte to Petabyte scalability
    • Linear performance gains through adding nodes
    • No single point of failure
    • Data distribution
    • No need for separate caching layer
    • Data consistency & compression
    • Support for key language & platforms
    • No need for extra hardware & software

    CouchDB

    CoachDB is a document oriented database server and a web server. It also allows for the application server. It is one of so called NoSQL database. It is also called as Apache CouchDB. It is an open source database. It uses Javascript as a query language. It has a multi master application.  For the API purpose, it uses the HTTP protocol.

    HBase

    It is a key value store. Specifically, it is known as Distributed data store. It has consistent store, sorted map and multi- dimensional. The following thing makes it different from other database.

    • Column oriented
    • Flexible schema, add columns on the fly
    • Good with sparse tables
    • Tight integration with MR
    • Horizontal scalability- just add hardware
    • Good for semi structured data as well as structured data

    Hypertable

    It is a high performance, scalable, distributed storage & processing system. It is an open source database. It only  supports the basic queries. It is modelled after Google’s big table. Mainly implemented in C++.

    MongoDB 

    It is a document oriented database. It is an open source product and it is developed and supported by the company called 10gen. It is available in the public and commercial license. It is a scalable, high performance, open source and document oriented database.

    Redis

    It is in memory data structure. It is open source for easy access. It has the Following Features.

    • Transactions
    • Pub/Sub
    • Lua scripting
    • Keys with a limited time-to-live
    • LRU eviction of keys
    • Automatic failover

    Riak

    It is designed to solve hard problems associated with building and scaling are read and write intensive applications. It has ability to store any type of data and does so across multiple nodes.

    See more:

    Top 10 Databases You Should Learn in 2015

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