On 12/16/21 00:45, Tom Lane wrote:
Remove pg_dump's --no-synchronized-snapshots switch.
Server versions for which there was a plausible reason to
use this switch are all out of support now. Leaving it
around would accomplish little except to let careless DBAs
shoot themselves in the foot.
Discussion: https://postgr.es/m/556122.1639520...@sss.pgh.pa.us
Hello,
I have seen one situation where this option could have been useful even on
recent Postgres version:
Few years ago, I have seen an instance hit wraparound (1 million transactions
left) due to a bug (vacuum didn't freeze some blocks, bug has been fixed since).
I had to perform a dump/restore, but can't use parallel dump as Postgres refused
to export transaction snapshot. So the dump was ... long.
Late in the night, I didn't notice I could have used --no-synchronized-snapshots
to perform parallel dump. As Postgres didn't accept new transaction, there was
no risk of incoherent dump.
I don't know if we should keep this option. I just want to share a case where
this option could have been useful.
Regards,
--
Adrien
