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 







Linux threaded_execution tips

Oracle Database Tips by Donald BurlesonJune 25, 2015


Question:  What does the Oracle Linux threaded_execution parameter do in Oracle 12c?

Answer:  The threaded_execution parameter allows a single O/S process with utilize multiple Oracle processes.  Some other O/S platforms (e.g. Windows) already use a threaded mode, allowing the OS to control the dispatching of Oracle processes.

The default for threaded_execution=false and it may not be read for prime-time in Oracle 12c. To see how threaded execution works, consider the following example:

SQL>  alter system set threaded_execution=TRUE scope=both;

$ ps -ef|grep -i ora_

oracle xxx - 00:00:00  ora_pmon_mydb12c
oracle xxx - 00:00:00  ora_psp0_mydb12c
oracle xxx - 00:00:00  ora_vktm_mydb12c
oracle xxx - 00:00:00  ora_u004_mydb12c
oracle xxx - 00:00:00  ora_u005_mydb12c
oracle xxx - 00:00:00  ora_dbw0_mydb12c

Notice that the number of background processes has dropped dramatically, with SMON and ARCH disappearing.  However, we still see VKTM. the virtual keeper of time provides wall-clock time and reference time for other sessions/processes and PSP0, the process spawner process.

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