Poul Kristensen wrote:
> Sorry for asking a lot.
>
> pg_replication_slots.
>
> is this meant to be a slot like a ethernetcard and controller in a physical server.
No, it is a data structure with which the PostgreSQL replication master can keep track how
far behind a replication slave is.
That way it can avoid discarding WAL that is needed by to replication slave to catch up.
Yours,
Laurenz Albe