Hannu Krosing wrote:
>
> Tom Lane wrote:
> >
> > Don Baccus <dhogaza@pacifier.com> writes:
> > > While I don't doubt your analysis is correct for the case you've
> > > uncovered, it doesn't explain why surrounding a bunch of selects
> > > with a begin/end block greatly descreases disk activity for tables
> > > that don't change.
> >
> > Hmm, I'm not sure why that should be, either. Anyone?
>
> >From a recent discussion I remember that every block that is read
> in is marked as dirty, regardless of weather it is modified or not.
No!
Vadim