An oracle database is a collection of data treated as a unit.The purpose of a database is to store and retrieve related information.A data base server is the key to solving the problems of information of management.in general,A server reliably manages a large amount of data in a multi-user environment so that many users can concurrently access the same data.All this is accomplished while delivering high performance.A data base server also prevents unauthorized access and provides efficient solutions for failure recovery.
The database has logical structures and physical structures :
1.The physical database structures of an oracle database,including,
a. Data files
b. Redo log files
c. Control files
2.The logical storage structure includes
a. Data blocks
b. Segments
c. Table spaces
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