I have upgraded an 11.2.0.4 database to 19c on a Solaris server - no errors and all appears OK. connecting to SQLPlus gives :
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.3.0.0.0
Show parameter compat -> 19.3.0
If I run an RMAN export, copy the files to a different server that had a fresh 19c install. (SQLPLus shows results the same as above)
When running the RMAN duplicate command (No target spfile backup location) I get an error when restoring spfile from backup location (autobackup directory)
ora-19690: backup piece release 19.3.0.0 incompatible with oracle release 19.0.0.0
I think that the rman backup is created as 19.3 but the auxiliary may be 19.0 is there a way to force the aux to be 19.3
Regards
Terry