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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
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
--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt
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