1、A date warehouse is a computer system designed for archiving and analyzing an organization’s historical data, such as sales, salaries, or other information from day-to-day operations. Normally, an organization copies information from its operational systems (such as sales and human resources) to the data warehouse on a regular schedule, such as every night or every weekend; after that, management can perform complex queries and analysis (such as data mining) on the information without slowing down the operational systems. In other words, the data warehouse contains the raw material for management’s decision support system.

2. Object-oriented programming (OOP) is a programming paradigm that uses ” objects ” to design applications and computer programs. It utilizes several techniques from previously established paradigms, including inheritance, modularity, polymorphism , and encapsulation. Even though it originated in the 1960s , OOP was not commonly used in mainstream software application development until the 1990s. Object- oriented programming’s roots reach all the way back to the creation of the Simula programming language in the 1960s,when the nascent field of software engineering had begun to discuss the idea of a software crisis. As hardware and software became increasingly complex, how could software quality be maintained ?