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Oracle® Database Reference
11g Release 2 (11.2)

E40402-12
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V$PQ_TQSTAT

V$PQ_TQSTAT contains statistics on parallel execution operations. The statistics are compiled after the query completes and only remain for the duration of the session. It displays the number of rows processed through each parallel execution server at each stage of the execution tree. This view can help determine skew problems in a query's execution. (Note that for PDML, information from V$PQ_TQSTAT is available only after a commit or rollback operation.)

Column Datatype Description
DFO_NUMBER NUMBER Data flow operator (DFO) tree number to differentiate queries
TQ_ID NUMBER 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 (seconds) the table queue remained open
AVG_LATENCY NUMBER Time (minutes) 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