Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com> writes:
> ISTM it should be possible to avoid sending full page writes to a
> streaming replica once the replica has reached a consistent state. I
> assume that the replica would still need to write full pages to it's
> disk in case of a crash, but the sender could insert special WAL records
> to tell it when to do so, instead of sending the full page image.
> Presumably this would be a big win for replication over a WAN.
How are you going to make that work without LSNs in the WAL received by
the replica diverging from those in the master's WAL?
regards, tom lane