PFC <lists@peufeu.com> writes:
> Just a stupid question about the various fsync settings.
> There is fsync=off, but is there fsync=fflush ?
> fflush would mean only an OS crash could cause data loss,
> I think.it could be useful for some applications where you need a speed
> boost (like testing database import scripts...) without being as scary as
> fsync=off...
I think you misunderstand. There aren't any scenarios where a PG crash
(without hardware/OS crash) risks data, because we always at least
write() data before commit. The only issue is how hard do we try to get
the OS+hardware to push that data down to disk.
regards, tom lane