ORA-00800: soft external error, arguments: [Set Priority Failed], [VKTM]

Symptoms: 

When starting up the Oracle 19c, it raises an error on the trace file and also creates an incident file with the message:

ORA-00800: soft external error, arguments:  [Set Priority Failed], [VKTM], [Check traces and OS configuration], [Check Oracle document and MOS notes], []

Cause: 

As given by the MOS article (Doc ID 2718971.1)

"19c moved to OL7/UEK4. UEK4 requires rt_period and rt_runtime set for the cgroup from where the d/b is started.

Typically the root one unless the customer is setting up their own cgroups or using system user slices.

It requires the proper values such as the 95%. For this problem, ORA-800 will have the following message in the incident. "

Solution:

Check the priority of VKTM @RDBMS level:

SQL> select a.ksppinm "Parameter", b.ksppstvl "Session Value", c.ksppstvl "Instance Value", a.KSPPDESC "Describtion"

from x$ksppi a, x$ksppcv b, x$ksppsv c

where a.indx = b.indx and a.indx = c.indx and a.ksppinm like '_%' and a.ksppinm like '_highest_priority_process%';

If not "VKTM" is not prioritiesed, please elevate the priority :

SQL> alter system set "_high_priority_processes"='VKTM' scope=spfile;

Restart DB and verify the same

SQL> show parameter "_high_priority_processes";

As root user, change file permission and owner

$ chmod root.oinstall $ORACLE_HOME/bin/oradism

$ chmod u+s oradism

Restart the database and check if it solved the error.

Otherwise, check the MOM Doc ID given above.

Hope that helps you.