Oracle Real Application Testing RAT Architecture 

Oracle Real Application Testing (RAT) is a comprehensive database testing solution that allows users to assess and validate the impact of changes on Oracle Database environments before deploying them in production. It includes a "Database Replay" feature for capturing and replaying production workloads on a test system, and "SQL Performance Analyzer" to analyze the impact of changes on SQL statement performance. RAT helps minimize risks, optimize performance, and reduce downtime during database upgrades, patches, or configuration modifications.