Database Security Essay

464 WordsApr 12, 20112 Pages
Introduction Database security entails allowing or disallowing user actions on the database and the objects within it. Oracle uses schemas and security domains to control access to data and to restrict the use of various database resources. Oracle provides comprehensive discretionary access control. Discretionary access control regulates all user access to named objects through privileges. A privilege is permission to access a named object in a prescribed manner; for example, permission to query a table. Privileges are granted to users at the discretion of other users. All organizations—public, governmental or private, small or large depend on computerized information systems for carrying out their daily activities. At the heart of each such information system, there is a database. At a very general level, we can define a database as a persistent collection of related data, where data are facts that have an implicit meaning. For instance, an employee's name, social security number, or dates of birth are all facts that can be recorded in a database. Typically, a database is built to store logically interrelated data representing some aspects of the real world, which must be collected, processed, and made accessible to a given user population. The database is constructed according to a data model that defines the way in which data and interrelationships between them can be represented. The collection of software programs that provide the functionalities for defining, maintaining, and accessing data stored in a database is called a database management system (DBMS). A database can be seen at different abstraction levels. Typically a three-level view is adopted containing an internal level, describing the physical storage of the database; a conceptual (or logical) level, providing the users with a high level description of the real world that the database represents;

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