Big Data > Hadoop > What are NoSQL databases?

What are NoSQL databases?

NoSQL databases are non-relational database systems that store and retrieve data differently than traditional SQL databases that can handle sizes of Big Data. They are non-relational, open-source, distributed databases which are:

• capable to handle the following types of data
  • structured,
  • semi-structured and
  • less structured,
• with no fixed table schema,
• with no JOINS,
• with no multi document transactions and (therefore)
• relaxing one or more ACID proper- ties.

 

The ACID properties of Atomicity, Consistency, Isolation and Durability are not strictly adhered to in NoSQL databases. In contract, NoSQL databases adhere to CAP (Consistency, Availability and Partition tolerance) properties.

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