V$PX_PROCESS contains information about the sessions running parallel execution.
| Column | Datatype | Description | 
|---|---|---|
| SERVER_NAME | VARCHAR2(4) | The name of the PX server (P000, P001, and so on) | 
| STATUS | VARCHAR2(9) | The state of the PX server ( IN USE|AVAILABLE) | 
| PID | NUMBER | The process identifier | 
| SPID | VARCHAR2(12) | OS process ID | 
| SID | NUMBER | The session ID of the PX server, if in use | 
| SERIAL# | NUMBER | The session serial number of the PX server, if in use |