Re: update about 100K records

Hi!

You could easily use rownum for doing this kind of update... Just do a commit after each update.

SQL> create table u (a number);

Table created.

SQL> alter table u modify a constraint un not null;

Table altered.

SQL> insert into u values (0);

1 row created.

SQL> insert into u values (0);

1 row created.

SQL> insert into u values (0);

1 row created.

SQL> insert into u values (0);

1 row created.

SQL> insert into u values (0);

1 row created.

SQL> commit;

Commit complete.

SQL> update u set a = 1 where a = 0 and rownum <= 2;

2 rows updated.

SQL> update u set a = 1 where a = 0 and rownum <= 2;

2 rows updated.

SQL> update u set a = 1 where a = 0 and rownum <= 2;

1 row updated.

SQL> update u set a = 1 where a = 0 and rownum <= 2;

0 rows updated.

SQL> Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Wednesday, July 09, 2003 2:09 AM

> I have a table of about one million records.
>
> About 100,000 of them have a flag which I need it set to 0.
>
> Because of the size of the rollback segment, I cannot
> update them all and then commit, I need to do it in
> sets of 1000 records.
>
> Do I need a cursor for this?
>
> I had something like that:
> DECLARE
> I BINARY_INTEGER;
>
>
> Cursor MyCursor IS
> SELECT *
> FROM (Table_Name)
> WHERE (Condition)
> FOR UPDATE;
>
> BEGIN
> I := 0;
> FOR MyRec IN MyCursor LOOP
> UPDATE (Table_name)
> SET delete_flag = 1
> WHERE CURRENT OF MyCursor;
>
> I := I + 1;
> IF MOD(I, 1000) = 0 THEN
> COMMIT;
> END IF;
>
> END LOOP;
> END;
> /
>
> But "FOR UPDATE" does not really work well, and at the 1000th record
> when it reaches the commit, its dropping out of the loop.
>
> Can I use ROWNUM to update them in batches of 1000 per time?
>
> Thanks,
> maa
>
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> --
> Author: Maryann Atkinson
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Tanel Poder
  INET: [EMAIL PROTECTED]

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