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
instance and
connecting to a hung database with the -prelim option.
The
Oracle
oerr utility show this for the ORA-12751 error:
ORA-12751: CPU
time or run time policy violation.
Cause:
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
notes:
- 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]".
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