Pre-upgrade report is showing the follow: REQUIRED ACTIONS ================ There is an unfinished DST update operation in the database. It's current state is: DATAPUMP(2)
In order to resolve this issue, run the alter command mentioned below:
ALTER SESSION SET EVENTS ‘30090 TRACE NAME CONTEXT FOREVER, LEVEL 32’; exec dbms_dst.unload_secondary; ALTER SESSION SET EVENTS ‘30090 TRACE NAME CONTEXT FOREVER, OFF’;
Now, database is ready for DST upgrade as DST_UPGRADE_STATE is NONE.