> Imho an implementation that opens a separate client connection to the
> replication target is only suited for async replication, and for that a
WAL
> based solution would probably impose less overhead.
Yes there is significant overhead with opening a connection to a
client, so Postgres-R creates a pool of backends at start up,
coupled with the group communication system (Ensemble) that
significantly reduces this issue.
Very good points,
Darren