UNIX is a computer operating system that performs multitasking and multiuser operations. The UNIX operating System was developed by AT&T labs. It was the brainchild of Ken Thompson and Dennis Ritchie. UNIX systems follow a “UNIX Philosophy” which means that the OS consists of a set of tools that performs simple, limited and well defined function. The main features of UNIX operating system are:

• It uses hierarchical directory structure which supports organization files and helps in managing the company.
• It consists of large number of support tools such as debuggers and compilers, and tools for web development.
• It is a multi-user operating system, i.e. more than one user can use machine at a time.
• It is also a multi-tasking operating system i.e. more than one work can be done at a time.
• It follows the features of portability.

MYSQL is the world’s most popular and most used open source RDBMS based on SQL (Structured Query Language). MySQL is a popular choice of database for use in web applications. It runs on virtually all platforms, including Linux, UNIX, and Windows. Although it can be used in a wide range of applications, MySQL is most often associated with web-based applications and online publishing and is an important component of an open source enterprise stack called LAMP. LAMP basically stands for Linux, Apache, MySQL, Python/ Perl/PHP.
MYSQL is often used by Free-software- open source projects that require a full-featured database management system. MySQL represents an excellent introduction to modern database technology, as well as being a reliable mainstream database resource for high- volume applications.

ORACLE or ORACLE DATABASE is Object Relational Database Management System created and marketed by Oracle Corporation. Oracle is fully reliable and scalable Relational Database Architecture, which is used to manage local and wide area network and is used by top global enterprises. It is one of the most trusted Relational Database engines used worldwide. The main benefits of ORACLE Database are:

It provides the Centralized Management System.
It provides Standardization and Consistency so that it becomes easy for technician to solve the problem.
It provides reliability and security in the storage of data.
Better Data Design and Mining.
Simplified Data Administration.

MS SQL Server is an Online Relational Database Management System (RDBMS) developed by Microsoft Corporation. It is a software database product whose primary function is used for data insertion, updating and storage of data in a managed and organized manner. There are several editions of Microsoft SQL Server for different workloads ranging from small single-machine applications to large Internet applications. Its primary query languages include T- SQL and ANSI SQL.