V$PQ_TQSTAT

This view contains statistics on parallel execution operations. The statistics are compiled after the query completes and only remain for the duration of the session. It displays the number of rows processed through each parallel execution server at each stage of the execution tree. This view can help determine skew problems in a query's execution.

Column	Datatype	Description
DFO_NUMBER	NUMBER	The data flow operator (DFO) tree number to differentiate queries
TQ_ID	NUMBER	The table queue ID within the query, which represents the connection between two DFO nodes in the query execution tree
SERVER_TYPE	VARCHAR2(10)	The role in table queue - producer/consumer/ranger
NUM_ROWS	NUMBER	The number of rows produced/consumed
BYTES	NUMBER	The number of bytes produced/consumed
OPEN_TIME	NUMBER	Time (secs) the table queue remained open
AVG_LATENCY	NUMBER	Time (ms) for a message to be dequeued after it enters the queue
WAITS	NUMBER	The number of waits encountered during dequeue
TIMEOUTS	NUMBER	The number of timeouts when waiting for a message
PROCESS	VARCHAR2(10)	Process ID
INSTANCE	NUMBER	Instance ID