Help me witn the bulk update

Question

i am trying to update a table with millions of data using row num but as iam dividing the data into sets,
while using rownum iam able to update only first set teh incremental set is not being updated.
please help with below query.
begin
select max(rownum) into t_max
from XXX where (condition)
k:=t_max/10000;
i:=0;
j:=0;
for l in 1..k+1 loop
i:=j;
j:=j+10000;
update XXX set customer_tag=null
where rowid in (select rowid from XXXX
where (condition)
and *(rownum<j and rownum>i);*
end loop;
end;
here update statement is not working for increment set ie for fromm 10000 to 20000 and so on

Answer 1

http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/pseudocolumns009.htm
Conditions testing for ROWNUM values greater than a positive integer are always false. For example, this query returns no rows:
SELECT * FROM employees
WHERE ROWNUM > 1;
Check if the following code meets your need:
<pre>
declare
cursor c is select rowid from XXX where (condition) order by rowid;
counter number :=0;
rowids dbms_sql.urowid_table;
begin
open c;
loop
fetch c bulk collect into rowids limit 10000;
forall i in 1..rowids.count
update XXX set customer_tag=null
where rowid = rowids(i);
commit;
counter := counter + 1;
dbms_output.put_line('Updated batch ' counter );
exit when c%notfound;
end loop;
close c;
end;
</pre>