Oracle database administration tutorial Last updated on May 19th, 2019 at 05:27 pmAn Oracle database is a collection of data treated as a unit. The purpose of a database is to store and retrieve related information. A database server is the key to solving the problems of information management.Many companies has implemented their data in Oracle. Most of them are mission critical. So Oracle database concept need to be very clear to manage these mission critical things. At the same time Oracle database needs to deliver high performance also. A database server also prevents unauthorized access and provides efficient solutions for failure recovery. Oracle Database Oracle tutorial: Oracle Database and Oracle Instance ORA-00257: archiver error. Connect internal only, until freed. 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