I’d like to upgrade the Postgres major version, which requires creating a new database and copying the data over to it. The simplest solution – forbidding writes to the old database, making a backup, and restoring it to the new database – is not viable for us, as from a business perspective we can’t accept the downtime that would entail (in my test, it took roughly an hour to do so).
The next tool I would reach to would be to set up logical replication from the old database to the new database. However, this doesn’t appear to be possible on render databases; it seems to require permissions I don’t have to set the wal_level or to CREATE SUBSCRIPTION.
Is there a way that I can either (a) get this replication set up or (b) is there an alternative way to do zero-downtime database copying?
