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Database Management Systems And Databases

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Abstract:
NoSQL Databases also referred as Not only SQL databases. These NoSQL database have these days gained much attention and reputation because of their performance and high scalability. The advantage of NoSQL database is to store efficiently unstructured data. These days use of e-commerce websites, social networking sites etc. has been increased. These usage made to create the need to store the large data. Some companies have adopted NoSQL databases, as their data is growing. Dynamo, Big table, Voldemort, Cassandra are the NoSQL databases that are used by Amazon, Google, and LinkedIn and Facebook respectively. Facing these huge data has become challenging for Relational Database Management Systems. Hence NoSQL database came into existence. Mostly Relational Database Management System satisfies ACID properties, through NoSQL database we can achieve high level of Scalability and performance. As a lot of sensitive data is stored in NoSQL databases security issues becomes growing concerns. This Paper explains about overview of NoSQL databases like Cassandra, mongo dB and their security features.
Introduction:
Database Management Systems has some basic requirements. They are confidentiality, integrity and Availability. Availability means the stored data should be available when needed. These data should be available only to the authorized entities called as Confidentiality. If that data is modified by the authorized entities it is called as integrity. The traditional

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