This is Part 4 of a series of quick learning guides for Oracle administrators, designers, developers and managers. Part 4 introduces early entrants with basic Oracle skills to the main concepts of Oracle data security and user privilege management and administration.The guide includes details of how to create and how to manage users and their database object and system access and rights. The guide also provides a basis for understanding different database security strategies such as role-based security, virtual private databases and procedure-based security.Part 4 contains a glossary of Oracle terminology related to database security and user privilege administration with clear explanations of the terms used.These guides are designed to rapidly deliver key information about Oracle to the following audience groups: - Project Managers, Database Administrators, Team Leaders, and Testers who are new to Oracle and need rapid access to strategic information about the Oracle security environment in both development and production databases.- Business Analysts, Software Designers and Developers who are new to Oracle and need to gain a detailed understanding of the data security and administration issues involved in an Oracle database.Part 4 of these guides assumes that the reader has read Parts 1, 2 and 3 of the Oracle Quick Guides or their equivalent content. The contents of Part 4 include the following subject headings:1. Oracle Database Security Architecture2. Managing Oracle User Security3. Managing Privileges and Roles4. Managing Resources with Profiles5. Managing Passwords with Profiles6. Special Users and Privileges - SYS, SYSTEM, SYSDBA, SYSOPER7. Managing Developer Security8. Virtual Private Databases (VPD)9. Procedure Execution Security10. Data Security using Views11. Tool Security - PRODUCT_USER_PROFILE Table12. Obtaining Security Information from the Data Dictionary13. Glossary of TermsAppendix 1 - Common System PrivilegesAppendix 2 - SYSDBA and SYSOPER PrivilegesAppendix 3 - SQL commands which can be disabled