Cursor not fetching the latest value in the loop.

Question

Hi!
I'm facing a peculear problem. I've a procedure which will check the total number of records in a loop. It will fetch that value. If that value mathced with certain condition then the outer loop execution need to stop. Here is my script -
<<Outer Loop Script>>
declare
  j  number(5);
begin
  j := 1;
  dbms_output.enable(100000);
while j <> 3 and j <=3
loop
  sel_pri(3,j);
  dbms_output.put_line('J is : '||j);
end loop;
  dbms_output.put_line('Executes.....');
exception
  when others then
    dbms_output.put_line(sqlerrm);
end;
-- Procedure Script --
create or replace procedure sel_pri(x  in number,y out number)
is
  pragma autonomous_transaction;
begin
   select count(a.flg) cnt
   into y
   from (
         select flg
         from   t_priority
         where  flg <= x
         and    flg < 4
         union
         select flg
         from   t_priority
         where  flg > x
         and    flg < 4
       ) a;
  --commit;
end; Now, the problem is -
Suppose i've two records are there in t_priority table. So, when i run my anonymous pl/sql block it won't satisfy the condition - as a result the loop will iterate untill the condition satisfiy. Now, if i insert data from a different session and commit the value in table t_priority which have only one field named flg and if count is 3. Then the process of the while loop should be stopped. But, it that is not happening. Infact it is fetching the old value. Why is it so?
Thanks in advance for your reply.
Regards.
Satyaki De.

Answer 1

sir i cannot understand your example.
SQL> declare
  2 
  3   cursor bc is
  4   select ename from emp;
  5 
  6   procedure change_in_another_trans
  7   is
  8    pragma autonomous_transaction;
  9   begin
10    update emp set ename = ename || '?';
11    commit;
12   end;
13  begin
14 
15   for v in bc loop
16 
17    if bc%rowcount = 3 then
18     change_in_another_trans;
19    end if;
20 
21    dbms_output.put_line(v.ename);
22 
23   end loop;
24 
25  end;
26  /
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
JAMES
FORD
MILLER
PL/SQL procedure successfully completed.
Procedure change_in_another_trans is autonomous and is executed
only once in the loop - when I fetched 3 rows from cursor. It updates
the data I fetch in cursor loop and commits autonomous transaction.
If Oracle would not support the read consistency for queries you had
SMITH
ALLEN
WARD
JONES?
MARTIN?
BLAKE?
CLARK?
SCOTT?
KING?
TURNER?
ADAMS?
JAMES?
FORD?
MILLER?
But you see the data as they were at the moment (exactly SCN - System Change Number) of the query issue dispite they have been changed by another transaction after the cursor has been open. Hope I'm clear now.
Rgds.