* Michael Paquier (michael.paqu...@gmail.com) wrote:
> On Thu, Jan 26, 2017 at 9:14 AM, Peter Geoghegan <p...@heroku.com> wrote:
> > On Wed, Jan 25, 2017 at 3:30 PM, Stephen Frost <sfr...@snowman.net> wrote:
> >> As it is, there are backup solutions which *do* check the checksum when
> >> backing up PG.  This is no longer, thankfully, some hypothetical thing,
> >> but something which really exists and will hopefully keep users from
> >> losing data.
> >
> > Wouldn't that have issues with torn pages?
> Why? What do you foresee here? I would think such backup solutions are
> careful enough to ensure correctly the durability of pages so as they
> are not partially written.

I believe his concern was that the backup sw might see a
partially-updated page when it reads the file while PG is writing it.
In other words, would the kernel return some intermediate state of data
while an fwrite() is in progress.



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