"Mikheev, Vadim" wrote:
>
> > The point is, that the heap page is only modified in places that were
> > previously empty (except header). All previous row data stays exactly
> > in the same place. Thus if a page is only partly written
> > (any order of page segments) only a new row is affected.
>
> Exception: PageRepairFragmentation() and PageIndexTupleDelete() are
> called during vacuum - they change layout of tuples.
>
Is it guaranteed that the result of PageRepairFragmentation()
has already been written to disk when tuple movement is logged ?
Regards.
Hiroshi Inoue