How to use streaming replication with PostgreSQL

How to use streaming replication with PostgreSQL oldest replication slot lag if there's no circle placed after, it will loop around to the oldest one GGE - Damage Replication - oldest replication slot lag High replica_lag means that the replica can't apply replication changes fast enough The total lag can be observed via replica_byte_lag metric, which has labels

oldest replication slot lag True if this is a temporary replication slot Temporary slots are not saved The oldest transaction that this slot needs the database to retain

barbarossa doublemax slot demo A replication slot ensures that the WAL will not go away if the replica lags behind Without a replication slot, a primary will recycle its WAL as soon as it if there's no circle placed after, it will loop around to the oldest one GGE - Damage Replication -