Loop test

I would like to write a PL/SQL to loop the database, and to show there is no disconnection.

any idea ?

I wrote something be

set serveroutput on
set head off
set feed off
alter session set nls_date_format='DD-MON-YY HH24:Mi:SS';

DECLARE
   currenttime timestamp;
   terminal varchar2(20);
   inst_name varchar2(10);
BEGIN
    WHILE( true ) loop
select sysdate ,sys_context ('userenv','TERMINAL'),sys_context ('userenv','INSTANCE_NAME') into currenttime,terminal,inst_name  from dual;
DBMS_OUTPUT.PUT_LINE('Current time: ' || currenttime || ' from Terminal ' || terminal || ' to Instance: ' || inst_name);
dbms_lock.sleep(2);
END LOOP;
END;
/