UPGRADE 12C to 19C IN PDB USING AUTOUPGRADE METHOD
LOG INTO THE DATABASE AND MAKE SURE THE CORRECT ORACLE HOME HAS BEEN SET.
CHECK STATUS OF ARCHIVELOG MODE IN THE DATABASE AND CHANGE IT TO ARCHIVE MODE AND TURN FLASHBACK ON
CREATE A NEW AUTOUPGRADE FOLDER AND NEW CONFIGUE FILE
ENTER THE DETAILS IN THE CONFIGURE FILES
CREATE ENV FOR 19C AND SET PATH TO BOTH 12C AND 19C
DOWNLOAD THE 19C SOFTWARE IN THE db_1 UNZIP THE FILE AND RUN THE RUNINSTALLER
FOR PRECHECKS FOR THE UPGRADE EMPTY THE RECYCLEBIN AND EXECUTE THE GATHER STATS AND SET THE FILE_RECOVERY_DESK=8G
EXECUTE THE ANALYZE PHASE OF THE AUTO UPGRADE TOOL WITH THE NEW CDB19 ENVIRONMENT
START THE FULL UPGRADE USING THE AUTOUPGRADE FEATURE IN 19C ENV
Now connect to the database and check whether it is updated or not
AFTER UPGRADE DROP THE RESTORE POINT
SET THE COMPATIBLE FILE TO UPDATED VERSION 19.3.0.0.0
THEN ATLAST SHUTDOWN AND STARTUP THE DATABASE