Re: Queries with large ResultSets

You can use a holdable cursor, and get a cursor outside of a
transaction, but beware, postgres has to store this somewhere, and it's
not update-able

Dave
On Thu, 2004-05-20 at 15:27, Andrea Aime wrote:
> Alle 20:44, giovedì 20 maggio 2004, Tom Lane ha scritto:
> > Andrea Aime <andrea.aime@aliceposta.it> writes:
> > > Ugh... those limitation are really frightening, this means we cannot
> > > fetch big quantities of data outside of a transaction...
> >
> > You were expecting something different?  Postgres does not do *anything*
> > outside of a transaction.
>
> Every other database I have some experience on (sql server, sapdb) allows you
> to use cursors regardless of the transaction. If you are working with a
> database in autocommit mode that doesn't mean that you don't need to load
> huge quantities of data... on the contrary, I would expect that it would be
> more costly to load the huge amount of data inside of a transaction because
> of transaction isolation.
> Anyway, that's not the matter, the real problem is that our generic jdbc code
> won't work properly with postgres because of this "feature" thus we will have
> to subclass everything that deals with the database in order to get the
> correct behaviour.
>
> If I am in autocommit = false mode, I will have to call connection.commit()
> after every write command to the database... isolation wise, to simulate a
> true autocommit, will I have to call connection.commit() also after reads if
> I raise the isolation level above READ_COMMITED?
>
> Best regards
> Andrea Aime
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
>                http://archives.postgresql.org
>
>
>
> !DSPAM:40ad082858103601796679!
>
>
--
Dave Cramer
519 939 0336
ICQ # 14675561