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 18c, Version 18.1 Changes in Oracle Database Release 18c, Version 18.1 The are no new features in Oracle Database Object-Relational Developer's Guide for Oracle Database release 18c, version 18.1.