Oracle
The Oracle relational database management system (RDBMS) is a powerful tool with an object-oriented technique that embraces polymorphism and inheritance. It is a grid computing product for enterprises that is known for being both flexible and affordable. Oracle´s use of different memory structures and processes allows for fast and efficient data retrieval and management.
MySQL
The MySQL is one of the most popular relational database management systems known to be a great tool for creating databases to be applied for managing as well as for storage and data manipulation. Besides, it includes the data relationships between different tables. Developers need to write SQL statements in order to send queries to MySQL, which can be utilized in the process of retrieving specific data. The server app finally reverts the order and sends back the information to the developers.
SQL Server
SQL Server, built by Microsoft, is a relational DBMS that supports a massive operation of transactions, prepares data for analysis, and displays information in reports to the decision-making process. It consists of modules of language such as Java, C#, R, or Python. In addition to that, Microsoft SQL Server goes a step beyond and lets users of different needs have the editions they require by offering editions such as Enterprise, Web, Standard, Developer, and Express.
MongoDB
MongoDB is a non-relational document-based database management system that provides users with a flexible data structure. This approach enables developers to store data in the unstructured manner they want it, provides indexing in a straightforward way, and replicates the information using simple API support. MongoDB reduces data distribution with the help of its scale-out architecture, while the data query language (MQL) is quite similar to SQL.