Will I miss any changes if I replace an oracle trigger while my application is running?

Question

I'm wondering if I will miss any data if I replace a trigger while my oracle database is in use. I created a toy example and it seems like I won't, but one of my coworkers claims otherwise.

create table test_trigger (id number);
create table test_trigger_h (id number);
create sequence test_trigger_seq;

--/
create or replace trigger test_trigger_t after insert on test_trigger for each row
begin
  insert into test_trigger_h (id) values (:new.id);
end;    
/

--/
begin
  for i in 1..100000 loop
    insert into test_trigger (id) values (test_trigger_seq.nextval);
  end loop;
end;
/

--/
begin
  for i in 1..10000 loop
    execute immediate 'create or replace trigger test_trigger_t after insert on test_trigger for each row begin insert into test_trigger_h (id) values (:new.id); end;';
  end loop;
end;
/

ran the two loops at the same time

select count(1) from test_trigger;

COUNT(1)
100000

select count(1) from test_trigger_h;

COUNT(1)
100000

Answer 1

create or replace is locking the table. So all the inserts will wait until it completes. Don't worry about missed inserts.