Re: Does psql use nested transactions?

Hola Alvaro

On Tue, 17 Aug 2004 16:58:56 -0400, Alvaro Herrera Munoz
<alvherre(at)dcc(dot)uchile(dot)cl> wrote:
> > On Wed, 11 Aug 2004 11:47:35 -0400, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > > The other objection is that this would create very substantial overhead.
> >
> > why?
>
> Establishing a savepoint is a non-trivial operation (cost-wise). Several
> internal server structures have to be prepared for it. It's way cheaper than
> normal transaction start and commit, but undesirable anyway if done once per
> query. Worse if it's going to be seldom used.

I see. So, any heavy use of savepoints, say, issuing one before each
SQL command that might violate a restriction, would worsen a lot the
performance of my application?

Saludos
Haroldo

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