Skip Headers
Oracle® Database Reference
11g Release 2 (11.2)

Part Number E25513-03
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Contact Us

Go to previous page
Previous
Go to next page
Next
PDF · Mobi · ePub
REFRN30185

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

Reader Comment

   

Comments, corrections, and suggestions are forwarded to authors every week. By submitting, you confirm you agree to the terms and conditions. Use the OTN forums for product questions. For support or consulting, file a service request through My Oracle Support.

Hide Navigation

Quick Lookup

Database Library · Master Index · Master Glossary · Book List · Data Dictionary · SQL Keywords · Initialization Parameters · Advanced Search · Error Messages

Main Categories

This Document

New and changed documents:
RSS Feed HTML RSS Feed PDF