Oracle Database is a Database, is Database that stores information in a structured way and which is used to retrieve information. The Oracle Database is the first Database that was designed for enterprise grid computing. And Oracle claims it to be a very flexible, and cost-effective way to handle information and applications that the enterprise could adapt to.
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The Oracle Database has both logical structures, as well as physical structures and both are separate. If you wish to become Oracle DBA, then I would recommend you to check out the Oracle DBA certification course from Intellipaat. If you are a beginner, I would suggest you check out our YouTube video on Oracle Tutorial.