Hi, On 2019-01-22 11:57:00 -0600, Jeremy Finzel wrote: > > > > That is news to me. Can you provide a citation for this? > > > > I can see the confusion in what I said. To clarify, I really meant that in > order to retrieve that data that you need in really old WAL segments, you > need to keep your replication slot in a position that will hold that WAL in > place. And that is what will prevent old rows from being vacuumed > away. Note replication slots only prevent old *catalog* rows from being removed, not old row versions in user created tables. Greetings, Andres Freund