Error Message

$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on 水 11月 10 10:54:56 2021
Version 19.12.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

oraclehoge: error while loading shared libraries: libodm19.so: cannot open shared object file: No such file or directory
ERROR:
ORA-12547: TNS: 
 

Infoscale document mention that "Back up Oracle's ODM library:" following step.
$ mv libodm.so libodm.so.oracle-`date +%m_%d_%Y-%H_%M_%S`

No changes required for the default link present inside /lib/libodm19 in Oracle 19c.(See: Oracle document ID 1936612.1)

Backup libodm file step is not necessary in oracle 19c. If you moved libdom file, move back the file.