PMON not able to start while starting the database instance.
(Doc ID 2511444.1)
Last updated on APRIL 09, 2020
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 and later
In New Oracle12c home start the database in upgrade mode.
oracle@1234> sqlplus / as sysdba
SQL*Plus: Release 220.127.116.11.0 Production on Fri Feb 22 23:32:36 2019
Copyright (c) 1982, 2017, Oracle. All rights reserved.
Connected to an idle instance.
SQL> STARTUP UPGRADE
ORA-00443: background process "PMON" did not start
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