Question: I am getting the
trace file error "DDE rules only execution for: ORA
12751 ". How do I prevent the ORA-12751 error?
My database is locked up and I cannot open a SQL*Plus
session as SYSDBA to do database diagnostics.
Answer: If you cannot connect, you have two
choices, either wait (impacting your end users) or
immediately bounce the instance. See
Killing the Oracle
connecting to a hung database with the -prelim option.
oerr utility show this for the ORA-12751 error:
time or run time policy violation.
A piece of code ran longer than it is supposed to.
Action: If this error persists, contact
Oracle Support Services.
This is a case of CPU exhaustion where the runqueue
exceeds the number of CPU's on the server. See my
important notes on locating
high CPU usage.
The solution to this
problem is to reduce CPU consumption by either tuning SQL
statements, or by adding additional CPU's to the server.
For more details see these
- MOSC note 1478691.1 titled
"Minact-scn: Useg Scan Erroring Out With Error E:12751"
- MOSC Note 761298.1 titled "MMON Suspended Due
to ORA-12751 "cpu time or run time policy violation".
- MOSC Note 1291296.1 titled "ORA-12751 "cpu
time or run time policy violation" in the MMON Slave
Process File during Feature Usage Statistics [FUS]".
Oracle Training from Don Burleson
The best on site
training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!
Burleson is the American Team
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
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
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
and include the URL for the page.
Copyright © 1996 - 2020
All rights reserved by
is the registered trademark of Oracle Corporation.