Object-Relational Developer's Guide Changes in This Release for Oracle Database Object-Relational Developer's Guide Changes in This Release for Oracle Database Object-Relational Developer's Guide This preface contains: Changes in Oracle Database Release 21c, Version 21.1 Changes in Oracle Database Release 21c, Version 21.1 The are no new features in Oracle Database Object-Relational Developer's Guide for Oracle Database release 21c, version 21.1.