Oracle 12cR2 - After Logon Exception

Logon trigger as below: create or replace TRIGGER USER3.MY_TRIGGER AFTER LOGON ON DATABASE BEGIN IF SYS_CONTEXT ('USERENV', 'SESSION_USER') IN ('USER30') THEN IF SYS_CONTEXT ('USERENV', 'HOST') NOT IN ('HOST1', 'HOST2', 'HOST3', 'HOST4') THEN INSERT INTO USER3.MY_TABLE (USERNAME, SID, OS_USER, HOST, IP, TERMINAL, DB_NAME, INSTANCE, INSTANCE_NAME, MODULE, SERVER_HOST, SERVICE_NAME, TIMESTAMP) VALUES (sys_context('USERENV', 'SESSION_USER'), sys_context('USERENV', 'SID'), sys_context('USERENV', 'OS_USER'), sys_context('USERENV', 'HOST'), sys_context('USERENV', 'IP_ADDRESS'), sys_context('USERENV', 'TERMINAL'), sys_context('USERENV', 'DB_NAME'), sys_context('USERENV', 'INSTANCE'), sys_context('USERENV','INSTANCE_NAME'), sys_context('USERENV','MODULE'), sys_context('USERENV','SERVER_HOST'), sys_context('USERENV','SERVICE_NAME'), SYSTIMESTAMP); COMMIT; RAISE_APPLICATION_ERROR(-20000, 'Denied! You are not allowed to logon.'); END IF; END IF; END; Without disturbing the existing structure in any way, I want to define read only (select) permission only on its own objects (USER30) if it comes from HOST2. Can you help with this issue? Best Regards,