V$CIRCUIT

Columns
   ___________________________
 
   CIRCUIT
   DISPATCHER
   SERVER
   WAITER
   SADDR
   STATUS
   QUEUE
   MESSAGES
   MESSAGE0
   MESSAGE1
   MESSAGE2
   MESSAGE3
   BYTES
   BREAKS
   PRESENTATION

Related Views:

V$CIRCUIT 
V$DISPATCHER 
V$DISPATCHER_RATE 
V$MTS
V$QUEUE 
V$REQDIST 
V$SHARED_SERVER 
V$THREAD