1) MySql :- MySQL Application Development as a universal solution for programming dynamic web pages at ease and at the same time easier to update and maintain. MySQL extensively for the development of excellent dynamic database-driven web pages for business and other forms of web application. 2) MongoDB:- MongoDB is an open source document-oriented database system developed and supported by 10gen. It is part of the NoSQL family of database systems. Instead of storing data in tables as is done in a “classical” relational database, MongoDB stores structured data as JSON-like documents with dynamic schemas (MongoDB calls the format BSON). MongoDB is designed with accelerating fast performance and infinite scale in mind. MongoDB is a great fit for projects with very large volumes of data and/or significant scale-out requirements that still require extremely high performance. 3) Solr:- Solr is an Open Source highly scalable enterprise search platform from Apache Lucene Project. Major features include full text search, highlighting search hits, query spell correction, faceted navigation and search, distributed search, database integration, and handling of various document formats. 4) Cassandra :- The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra’s support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. 5) Oracle :- We created many software in Oracle database, we follow the standard of oracle like procedure, trigger, locking, save point, roll back and commit.