An Oracle 9i database is a collection of information treated as a unit. The purpose of a
database is to save and retrieve information. A database is a key for
solving the problems of information management. In general, a server reliably
manages a large amount of information in a multiuser environment so that many users can
concurrently access the same data or information. All this is accomplished while delivering high
performance. A database server also prevents unauthorized access and provides
efficient solutions for failure recovery.