Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







  QMON background task tips

Oracle Database Tips by Donald BurlesonApril 14, 2015

Question:  What are the QMON background process called?  I do not see any process called QMON when I do a "ps –ef|grep –I qmon".  What are the QMON processes and their functions?
Answer: The QMON background process names are determined by your release of Oracle:

Pre 10g:  Prior to 10g, Oracle has QMNx (where x=0 . . .n), such that you may observe a background process named qmno_.  In release prior to 10g the QMON processes were controlled by the aq_tm_processes parameter.  It was used to control the behavior of this spawning of AQ slaves (the maximum number of slave processes for advanced queuing), and aq_tm_processes should never be set to a value of zero.

10g and beyond:  In 10g and beyond, there is no process called QMON, the term query monitor (QMON) is a term that describes the query monitor coordinator (Queue Monitor Coordinator (QMNC) and all of the sub-processes spawned by QMNC, processes with the names Q01, Q02, etc.
This QMNC process is responsible for facilitating various background activities required by Advanced Queuing (AQ) and Oracle Streams.    The QMNC process was introduced in 10g release 1, and it is responsible for allocating tasks to the QMON sub-processes (q01, q02, . . . ) .  In 10g and beyond, the aq_tm_processes parameter is not used.

Also see these related QMON Notes:

Oracle Training from Don Burleson 

The best on site "Oracle training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!

Oracle training



Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.



Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster