On Fri, Dec 26, 2014 at 04:07:11PM -0500, Bruce Momjian wrote: > On Fri, Dec 26, 2014 at 01:11:57PM +0300, Borodin Vladimir wrote: > > Hi all. > > > > I ve read thread [0], src/backend/storage/page/README and everything I found in > > the documentation about checksums [1, 2] but I haven t understood what is my > > risk if I enable checksums during initdb and turn off full_page_writes? > > > > Am I right that I can get torn pages on disk in that case but I will somehow > > know about it during checksum checking when this page will be read from disk to > > shared buffers? And is there any way to recover such torn page (from replica or > > Yes. > > > backup+archived logs, for example)? > > There is no way to _fix_ the torn page, but you can ignore the error > with ignore_checksum_failure: > > http://www.postgresql.org/docs/9.4/static/runtime-config-developer.html Oh, you can fail-over to the replica, of course, but there is no clean way to restore just the torn page. -- Bruce Momjian <bruce@xxxxxxxxxx> http://momjian.us EnterpriseDB http://enterprisedb.com + Everyone has their own god. + -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
