On Wed, Jan 25, 2017 at 7:19 PM, 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.
Well, you'd have to keep a read(fd, buf, 8192) performed by the backup tool from overlapping with a write(fd, buf, 8192) performed by the backend. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
