What should be monitored to ensure security in a database environment?

• A. Active user sessions
• B. Expired accounts removal
• C. Database size limits
• D. System performance metrics

Answer: (B)

Monitoring expired accounts removal is crucial for ensuring security in a database environment because it helps prevent unauthorized access. When user accounts that are no longer active or needed are not removed, they can potentially be exploited by malicious actors to gain unauthorized access to sensitive data. Regularly auditing and removing expired accounts ensures that only authorized users have access to the database and reduces the attack surface.

While monitoring active user sessions, database size limits, and system performance metrics is important for database management and the overall health of the system, these factors are not directly linked to improving security. Active user sessions can help monitor current access but may not indicate whether old accounts are still present. Database size limits and performance metrics relate more to system capacity and efficiency rather than the security of the data itself. Thus, focusing on expired account removal directly addresses a fundamental aspect of database security.