DBA_PARALLEL_EXECUTE_CHUNKS
I was not able to find this anywhere so therefore this comment.
As sys I created some chunks using:
DBMS_PARALLEL_EXECUTE.CREATE_CHUNKS_BY_SQL
I expected that the job would be visible in DBA_PARALLEL_EXECUTE_CHUNKS for other users also. This is almost the case.
However ORACLE has decided that only the creator of the task can see start_rowid, end_rowid, start_id and end_id. This is due to the follwing in the view definition of DBA_PARALLEL_EXECUTE_CHUNKS:
case when userenv('SCHEMAID') = c.task_owner# or userenv('SCHEMAID') = 0
then c.START_ROWID
else null