Oracle 19c (the "Long Term Support" release) introduced several performance and management features: IT Convergence Official New Features Guide (PDF) — Detailed list of every technical change. Introduction and Overview White Paper (PDF) — A high-level look at why to upgrade. The Optimizer in Oracle 19c (PDF)
The is your map for performance tuning. It details a systematic methodology: oracle sql 19c pdf new
Rather than introducing sweeping architectural rewrites, 19c focuses on fixing edge-case bugs and polishing existing features. Key SQL Enhancements in Oracle 19c Oracle 19c (the "Long Term Support" release) introduced
Beyond pure query execution, Oracle 19c enhances the management layer that governs how SQL runs across the cluster. Quarantine of Runaway SQL Statements oracle sql 19c pdf new