I meant using tools other than sql (and psql). I have java code using org.postgresql.copy package because straight insert was too slow for large numbers of rows.If you can get outside sql, the bulk copy facilities (CopyManager in java) is blindingly fast for me.
Logical replication might be another option.
Although I am not sure if that is even possible inside
the samme database.
I know it's tricky inside the same server
(between different databases)
??