On 2020-10-19 20:21:05 +0200, Pavel Stehule wrote: > po 19. 10. 2020 v 20:18 odesílatel Igor Korot <ikoro...@gmail.com> napsal: > On Mon, Oct 19, 2020 at 12:51 PM Pavel Stehule <pavel.steh...@gmail.com> > wrote: > > It is a different thing - postgresql_fdw does nested connect - it uses > > client-server protocol. > > > > For postgres connect and sql engine process is one entity - and engine > is > > written without a possibility to reconnect to another database. > > So if I understand correctly the postgresql_fdw is creating a second > connection and uses it as kind of "virtualizing mechanism" > in order to give access to the second database. > > > yes - it does new connect to somewhere (local or remote server, but mechanism > is absolutely same)
In case this isn't clear:
It is the server (or more specifically, the foreign data wrapper) which
opens that connection. To the client it looks like it's just accessing a
normal table within the same database.
hp
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