Re: One way replication in PostgreSQL

Le mar. 4 juin 2019 à 09:03, PALAYRET Jacques <jacques(dot)palayret(at)meteo(dot)fr> a
écrit :

> Hello,
>
> Thanks a lot for the suggested solutions.
>
> So, I can use WAL-shipping replication from Primary to the Secundary
> server, but it's only for full replication.
>
>
Yes.

Let's call " P " the provider/primary/master and " S " the
> subscriber/secundary/slave one.
> For partial replication (not all the tables), the solutions should use a
> third (intermediate / middle) server which could have both ways flow with
> the server P but only one way flow towards the server S.
> For example, a logical replication (pglogical or logical Postgresql
> replication) between server P and the middle server and then a WAL-shipping
> replication between middle server and server S.
> Is that right ?
>
>
That could work.

About the " FDW " solution in " an external server " (a middle one), is it
> possible to integrate the FDW in the P server to avoid the " external
> server " ?
>
>
Not sure I understand where you're going here.

=> What about the trigger-based replication systems like Slony or Londiste
> ; is it really necessary to have a connection or flow from the server S
> towards the server P ?
>
>
As far as I remember, with Slony, P must be able to connect to S, and S
must be able to connect to P.

--
Guillaume.
Dalibo.