On 4/6/19 10:02 π.μ., 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 ?
I'll describe our solution here, but its a far fetched approach, a diving into
uncharted waters situation, but for us it was the only solution back in early
2000.
In one word : The long forgotten DBMirror (Mentioned during "Postgresql 11 : what's old" comments that followed the presentation in Lisbon pgconf2018.eu) . You can setup your triggers, produce your
SQL files, sent them to S whatever method you wish and run them without any connectivity from S to P.
Setting up is very easy. However you must be prepared to carry this as "technical
debt" in future upgrades.
No Slony expert here, but in https://severalnines.com/blog/experts-guide-slony-replication-postgresql it is mentioned that you can ship in the form of SQL files as well. So you setup a slony slave
inside your P system and produce SQL files which you replay to your remote S, with no connectivity to P.
Regards
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*De: *"PALAYRET Jacques" <jacques.palay...@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.palay...@meteo.fr
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