Atonomous Transcation

Question

Can some one expalin what autonomous transcations is and where exactly it is used and can we have an exception in a trigger?

Answer 1

Here is the simple example,
create or replace procedure p1
as
pragma autonomous_transaction;
begin
insert into log values('08-may-1981','sample entry1');
commit;
end;
create or replace procedure p2
as
begin
delete from log where operation='sample';
end;
create or replace procedure p3
as
begin
p2;
update log set operation='sample1';
p1;
rollback;
end;
There are 3 procedure p1,p2 and p3...P1 is having autonoums transaction and it's commited. p2 is not having autonomous.. Now, from p3 you are invoking p2 and updating log to some sample1..
Then p1 is being called..After p1 you are rolling back.. What will happen know,
Only update statement which is done in p3 and delete which is done in p2 will be rolled back.. The new record will be inserted into log in p1 and it'll be commited as it's autonoumous transaction..
Hope u can understand now..
Thanks
Raja