The FDW is a PostgreSQL extension to connect to other server from PosgreSQL server inside, with this solution you only need connections from P to S and no need a third server (external server), just use triggers to push the INSERT/UPDATE/DELETE information you want to replicate from P to S through Foreign Data Wrapper.
If you need integrity on the replicated information then I suggest to use a control table to store the actions to replicate for the case when it fails you can keep trying til the action succeeds.
Regards
On Tue, 2019-06-04 at 09:02 +0200, PALAYRET Jacques wrote:
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.
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 ?
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 " ?
=> 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 ?
Regards
De: "PALAYRET Jacques" <jacques.palayret@meteo.fr>
À: pgsql-general@lists.postgresql.org
Envoyé: Lundi 3 Juin 2019 18:00:51
Objet: One way replication in PostgreSQL
Hello,
If, for security reasons, I can't create a connection or a flow from subscriber/secundary/slave towards provider/primary/master, witch replication systems can I use ?
If possible, I would prefer partial replication (only some tables) to full base replication (all instances).
Do trigger-based replication systems (like Slony or Londiste or others) need a connection or flow from subscriber to the provider ?
Thanks in advance
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PALAYRET JACQUES
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jacques.palayret@meteo.fr
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