Commit interval while removing duplicates

Question

I am trying to remove duplicates from a table with over 10million records. Below query is working fine but it doesnt contain any COMMIT interval. I have to commit after every 20k or 30k records deletion for which IF loop is necessary.
Can anyone help me with it please ?
Query:
delete from
customer
where rowid in
(select rowid from
(select
rowid,
row_number()
over
(partition by custnbr order by custnbr) dup
from customer)
where dup > 1);

Answer 1

937851 wrote:
I am trying to remove duplicates from a table with over 10million records. Below query is working fine but it doesnt contain any COMMIT interval. I have to commit after every 20k or 30k records deletion for which IF loop is necessary. It is more efficient to delete all the rows and commit once
10M rows is a good number but modern systems should be able to support the delete. If you are worried about running out of rollback/undo you can (only if necessary!) batch deletes and perform periodic commits, something like (again, only if necessary)
delete from whatever
  where key in (result from subquery)
     and rownum <= 1000000;
delete from whatever
  where key in (result from subquery)
     and rownum <= 1000000;
delete from whatever
  where key in (result from subquery)
     and rownum <= 1000000;
. . .