The problem as stated: After upgrading the Oracle Database from 12c to 19c the following error generated in the alert log file. Actual Oracle Error Code: ORA-00800 After Upgrading from 12c to 19c ORA-00800: soft external error, arguments occured Oracle Database Enterprise 19c fails to start with error: ORA-00800: soft external error, arguments: [Set Priority Failed], [VKTM] Why does Insights prevent Oracle grid services from starting How to configure the User slice to allow Real-Time Scheduling for user processes In Alert Log: Errors in file /u01/app/oracle/diag/rdbms/orclproddbone/orclprod/trace/psbcdb_vktm_3529.trc (incident=1200048) (PDBNAME=CDB$ROOT): ORA-00800: soft external error, arguments: [Set Priority Failed], [VKTM], [Check traces and OS configuration], [Check Oracle document and MOS notes], [] Incident details in: /u01/app/oracle/diag/rdbms/orclproddbone/orclprod/incident/incdir_1200048/psbcdb_vktm_3529_i1200048.trc 2023-10-30T10:04:53.536165+06:00 Error attempting to elev
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