After upgrading many databases to Oracle 19c, I have faced an interesting error when I reached to the step of switch my environment variables to 19c binaries and starting the database in upgrade mode:

sqlplus / as sysdba

SQL> startup upgrade;

ORA-00119: invalid specification for system parameter DISPATCHERS

ORA-00109: invalid value for attribute PRESENTATION: oracle.aurora.server.SGiopServer

after checking I found out that currently this is the parameter vaule:

SQL> show parameter dispatchers

NAME                                 TYPE        VALUE

———————————— ———– ——————————

dispatchers                          string      (PROTOCOL=TCP)(PRE=oracle.auro

                                                 ra.server.SGiopServer)

basically DISPATCHERS configures dispatcher processes in the shared server architecture: https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/DISPATCHERS.html

in 19c the expected value is ‘(PROTOCOL=TCP)

so, either use alter system command or update your init.ora file and startup the database again in upgrade mode !

SQL> ALTER SYSTEM SET dispatchers = ‘(PROTOCOL=TCP)’;