为了保证数据库数据的安全可靠性和正确有效，DBMS必须提供统一的数据保护功能。数据保护也为数据控制，主要包括数据库的安全性、完整性、并发控制和恢复。-database data in order to ensure the safety and reliability of correct and effective, DBMS must provide centralized data protection. Data protection for data control, including database security, integrity, concurrency control and recovery.