RE: [HACKERS] heap page corruption not easy

[Mikheev, Vadim]

> > > 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 ? No. Vadim