Re: Persistent changes in rolled-back transactions

Why do you say truncate is non-transactional? Something simple proves that
it's not?

wells=# create table foo (f text);
wells=# insert into foo values('cat');
INSERT 0 1
wells=# select * from foo;
f
-----
cat
(1 row)
wells=# begin;
BEGIN
wells=*# truncate foo;
TRUNCATE TABLE
wells=*# rollback;
ROLLBACK
wells=# select * from foo;
f
-----
cat
(1 row)

On Wed, Nov 9, 2022 at 5:16 PM Wael Khobalatte <wael(at)vendr(dot)com> wrote:

> > I've noticed serials still maintain incremented values even when a
> transaction is rolled back. Are there other similar persistent changes to
> be aware of?
>
> Postgres sequences (what backs the serial type) are non-transactional.
> nextval, setval, et al. Truncate is also non-transactional.
>

--
Wells Oliver
wells(dot)oliver(at)gmail(dot)com <wellsoliver(at)gmail(dot)com>