How to run DDL on busy objects ?

Sometimes we always get resource too busy when DDL on a object. Here is how to use PL/SQL to do that.
declare
  resource_busy exception;
  pragma exception_init (resource_busy,-54);
begin
loop
   begin
     execute immediate 'alter index INDEX_NAME noparallel';
     exit;
   exception
    when resource_busy then
     dbms_lock.sleep(1);
   end;
end loop;
end;
/

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