大表 update 方式

--

declare
  cursor cur_t is
    select rowid rid from tpr_zwjyw3 where dwid=10113222;
  type tab_t is table of urowid index by binary_integer;
  l_rid tab_t;
begin
  open cur_t;
  loop
    fetch cur_t bulk collect
      into l_rid limit 45000;
    forall idx in 1 .. l_rid.count
      update tpr_zwjyw3 t set t.zh ='没有' where rowid = l_rid(idx);
    commit;
    exit when cur_t%notfound;
  end loop;
  close cur_t;
end;

千万级别的数据 update 或delete  效果明显