Code : Create Global temporary tables

create global temporary table gtt_ (
  x_ varchar2(100)
) on commit delete rows;

create table t_ (
  x_ varchar2(100)
);

exec redo_diff.diff_it;

declare
  i number;
begin
  for i in 1 .. 1000 loop
    insert into gtt_ values(dbms_random.string('a',99));
  end loop;
end;
/

exec redo_diff.diff_it;

declare
  i number;
begin
  for i in 1 .. 1000 loop
    insert into t_ values(dbms_random.string('a',99));
  end loop;
end;
/

exec redo_diff.diff_it;