NoSQL Databases

NoSQL databases provides a mechanism for storage and retrieval of data which does not have a tabular format.  MongoDB encompasses a wide variety of technology which demands when presenting applications. Developers always create new rapidly changing, structured and unstructured data. Applications which was saved in finite machines now have become a service that can be always accessed by globally millions of people in the world. Relational database always designed with taking the advantage of commodity storage and processing power.

These are created to address the shortcoming of RDBMS with the demands of modern software development. This has a simple relational structure used in relational database. This was coined in 1960. This uses big data as well as a real time web application. These are sometimes called as “not only sql “databases. In NoSQL there is a fine and simple design methods for all the events. Many NoSQL provides compromise consistency. Many NoSQL saves compromise consistency.

These databases remove the mismatch between applications in memory and relational databases. Relational databases are not supporting for the clusters. Aggregate databases supports are easier to manage with clusters and domain driven design. But when it becomes for inter aggregate relations as those are harder to manage.

NoSQL Database Types

Document Database

• Pars each with complex data structures. These are known as documents. These contain key value pairs and such as social connections.

Graph Stores

• These are used to store networks connections.

Key Value stores

• This is the simplest way and every single item in the database is stored as an attribute.

Wide- column stores

• Stores rows and columns together instead of storing them row wise.

Replication of NoSQL

Most NoSQL databases tries to maintain the availability in the maintenance event. These databases are always enriched with self-healing, auto recovery and other more specific features. There are no requirements to be separated in NoSQL databases.

CAP Theorem

CAP theorem consists of availability, partitioning and consistency. This is a concept that says any of the CAP theorem cannot be without even one of the availability, consistency and partitioning. This is also named as the Brewer’s theorem.

Consistency

• Here all the clients see the data in a same manner and every read always receives the recent write.

Availability

• Every client can find a replica of the data even after any failure. Every request receives the response.

Partition

• The system continues to work as they expected even in network failure 
• There are more famous NoSQL databases such as MongoDB , Cassendra and so on.

MongoDB

• MongoDB is found in 2007 by Dwight Merriman, Eliot Horowitz and Kevin Ryan. A company owned by Google called DoubleClick has this expert team. This has become a more powerful software and the best leading database in the world now. MongoDB owns 15900 customers in hundred countries.
• Nowadays MongoDB Atlas has become more famous all among the world as that is the cloud based service for modern application. This can be fully managed by Azure as well as AWS. Automation, scalability, integration and security supplies us this condition. This builds faster and spend less time managing your database. There are global clusters for world class applications. This is secure for more sensitive data. Built with security control and feature to satisfy the availability. This is developed based on the productivity of the developers.

Cassendra

• This can be recommended as the best database for increase the scalability and the performance of your application. This has the fault tolerance of hardware and cloud infrastructure. It helps to replicate across multi center databases. It just provides lower latency for the users.
• Here, data is automatically replicated for multiple nodes for fault tolerance. There no network bottlenecks and single point of failures. This has a very special feature for scaling. Therefore, many companies like Apple, Netflix and eBay use this as their service. 

Anyway NOSQL database is a famous service for all the developers as they do not need to fight with logical hard theories of database by trying this easy creation. Therefore, many companies and many developers tries to build their applications by using NoSQL databases. This has become reason for almost all the developers to save their time as well as pay their attention for their core concepts.