How can I modify this to process 80,000 records at a time until finish.

Question

Hello it's me again -
Without using a rownum limit in my cursor declare my record-set is around 10 million records. This causes problems within our environment. Is there a way I can loop the following code and only do 80,000 at a time.
1 process 80,000
2. process next 80,000.
How would I redeclare the cursor in a loop and grab the next 80,000?
Thanks again
Steve
SET SERVEROUTPUT ON
DECLARE
CURSOR vt_mlr_cursor IS Select master_key, tn, user2 from vt_mlr Where user2 is not null and rownum < 80001;
USERFIELD VARCHAR2(100);
R_count NUMBER := 0;
Field1 VARCHAR2(20);
Field2 VARCHAR2(20);
key VARCHAR2(10);
phone VARCHAR2(11);
BEGIN
FOR vt_mlr_record IN vt_mlr_cursor
LOOP
BEGIN
     key := vt_mlr_record.master_key;
     phone     := vt_mlr_record.tn;
     USERFIELD := vt_mlr_record.user2;
     Field1 := SUBSTR(vt_mlr_record.user2,12,4);
     Field2 := SUBSTR(vt_mlr_record.user2,28,4);
          UPDATE vt_mlr
          SET
          line_medr = Field1,
          line_aidr = Field2
          WHERE
          master_key = vt_mlr_record.master_key;
          R_count := R_count + 1;
     EXCEPTION
     when others then
     Insert into temp_reject (REJECT_KEY, REJECT_TN, REJECT_VALUE) VALUES
     (key, phone, 'USER2 ' || USERFIELD );
     R_count := R_count - 1;
END;
END LOOP;
     commit;
     EXCEPTION
     when others then
     DBMS_OUTPUT.PUT_LINE('Error code ' || sqlcode || ' Error desc' || SUBSTR(sqlerrm,1,200));
END;

Answer 1

Add a "last_update" or "modified" column to your table.
Then do this:
declare
CURSOR vt_mlr_cursor IS
   select master_key, tn, user2
   from vt_mlr
   where user2 is not null and rownum < 80001
         and modified != 'Y'
(or)
         and last_update < begin_date ;
   begin_date constant date := sysdate ;
begin
  update vt_mlr
     set line_medr = Field1,
         line_aidr = Field2,
         modified = 'Y'
(or)
         last_update = sysdate