ROLLBACK TO SAVEPOINT Sample With Oracle9i,Oracle11g Databases Cases

Let's see the reaction of ROLLBACK TO SAVEPOINT a with a scenerio of two different databases below. It is explained in here with sql coding.

Sql Code:
>create table product
(pcode number(2),
pname varchar2(10));

>insert into product values(1,'pencil');

>insert into product values(2,'pencil');

>savepoint a;

>update product set pcode=10 where pcode=1;

>savepoint b;

>delete from product where pcode=2;

>commit;

>delete from product where pcode=10;


>rollback to savepoint a;


>select * from product;

Oracle 9i result;
This is different.

Oracle 11g result;

 No sql statement rollbacked.
 The rollback generates an error.