Oracle Database is a relational database management system (RDBMS). It is one of the leading software products in the world and has been used by many organizations for storing and accessing data.

The DBA is responsible for the design, creation, tuning, and monitoring of databases to ensure that they are available 24x7x365. The position requires expertise in Oracle Database administration, performance analysis, storage design and management, backup and recovery techniques, security administration and access control.

Oracle APPS DBA provides essential knowledge and skills for designing, developing and managing Oracle Applications.This certification is designed to be a prerequisite for those who want to work with Oracle Applications such as PeopleSoft, JD Edwards, Siebel, or E-Business Suite.

It covers topics like installation and configuration of the Oracle Application Server (OracleAS), Oracle Database (Oracle Database), and Oracle WebLogic Server (Oracle WebLogic Server).

Linux is a free and open-source operating system.

Linux is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released 5 October 1991 by Linus Torvalds.

Linux was originally developed as a free operating system for Intel x86-based personal computers. It has since been adapted to more platforms than any other operating system, with variants being present on more than 17% of all supercomputers in the world as of November 2017.