How to detect sessions that are currently running parallel queries?

Hi everyone,
How to detect session that are currently running parallel queries?
- The only way i can think of is querying pdml_Status from gv$session?
- Is there a better way to do this?
Follow up question:
After detecting sessions that are running parallel queries how do i identify which sessions are slaves of which session?
thanks!

Start with V$PX_SESSION, however also take a look at V$PQ_* and V$PX_* tables.

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