$USDC V$USDC is a dynamic performance view in Oracle Database that provides real-time information about the system change number (SCN) and related details for database consistency and recovery. It primarily helps in monitoring and managing distributed transactions and data consistency across instances. The SCN is crucial for maintaining transactional integrity and ensuring point-in-time recovery. V$USDC displays SCN values used internally to track data changes, aiding DBAs in troubleshooting synchronization or replication issues. Although not frequently accessed directly by most users, it plays a vital role in advanced database diagnostics, especially in environments involving high availability and data replication strategies.