Dynamic Performance (V$) Views, 108 of 179

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

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