Database Server Upgrade/Downgrade Compatibility Matrix (Doc ID 551141.1)

Upgrade Compatibility Matrix for Upgrading to 23ai

Note: 23ai released only for Oracle Database Cloud services & Exadata
23ai is still not released for On-Premises Server.Once it's released the information will be updated.

                                                                                           Minimum Version of the database that can be directly upgraded to Oracle Database 23ai

Direct upgrade to 23ai is not supported to rest of the database releases/versions which are not mentioned above.
So first Upgrade to an intermediate Oracle Database release which can be then directly be upgraded to 23ai.

Upgrade Compatibility Matrix for Upgrading to 21c

                                                                                           Minimum Version of the database that can be directly upgraded to Oracle Database 21c

Direct upgrade to 21c is not supported to rest of the database releases/versions which are not mentioned above.
So first Upgrade to an intermediate Oracle Database release which can be then directly be upgraded to 21c.

Upgrade Compatibility Matrix for Upgrading to 19c 

                                                                                        Minimum Version of the database that can be directly upgraded to Oracle Database 19c

Direct upgrade to 19c is not supported to rest of the database releases/versions which are not mentioned above.
So first Upgrade to an intermediate Oracle Database release which  can be then directly be upgraded to 19c.