PDB01:SQL> GRANT ADMINISTER DATABASE TRIGGER TO atlas_muon_cert;

Grant succeeded.

PDB01:SQL> @connect
Enter value for username: atlas_muon_cert
USER is "ATLAS_MUON_CERT"
PDB01:SQL> CREATE OR REPLACE TRIGGER atlas_muon_cern_logon after logon on DATABASE
  2  DECLARE
  3  BEGIN
  4  execute immediate 'alter session set cursor_sharing=force';
  5  END;
  6  /

Trigger created.

PDB01:SQL> exit