Changes in This Release for Oracle AI Database Get Started with Performance Tuning This preface contains: Changes in Oracle AI Database Release 26ai Changes in Oracle Database Release 19c, Version 19.1 Changes in Oracle Database Release 18c, Version 18.1 Changes in Oracle Database 12c Release 2 (12.2) Changes in Oracle Database 12c Release 1 (12.1.0.2) Changes in Oracle Database 12c Release 1 (12.1.0.1)