Обсуждение: [ADMIN] Replicate only 1 out of 2 databases of Server A to Server B ?
Hi all.
PostgreSQL 9.2.18
Running on replication mode Master-Slave (async).
Server A (2 databases) is fully replicated to Server B.
That works OK.
Question:
Is it possible to replicate only 1 out of 2 databases of Server A to Server B?
Best regards,
czezz
Yes, that is possible through PostgreSQL's logical replication system. It sounds like, however, you're using streaming replication and that cannot replicate just one database from the master cluster. So, you'll have to change your mechanism. Suggest you look at configuring logical replication.
--
Jay--
On Mon, Apr 24, 2017 at 9:33 AM, czezz <czezz@o2.pl> wrote:
Hi all.PostgreSQL 9.2.18Running on replication mode Master-Slave (async).Server A (2 databases) is fully replicated to Server B.That works OK.Question:Is it possible to replicate only 1 out of 2 databases of Server A to Server B?Best regards,czezz
Re: [ADMIN] Replicate only 1 out of 2 databases of Server A to ServerB ?
От
"David G. Johnston"
Дата:
On Monday, April 24, 2017, czezz <czezz@o2.pl> wrote:
Hi all.PostgreSQL 9.2.18Running on replication mode Master-Slave (async).Server A (2 databases) is fully replicated to Server B.That works OK.Question:Is it possible to replicate only 1 out of 2 databases of Server A to Server B?
Not without third-party software. Or separating the databases into their own clusters. You have more logical decoding options since 9.4 though I'm not personally familiar with their use.
David J.
On Mon, Apr 24, 2017 at 9:33 AM, czezz <czezz@o2.pl> wrote:
Hi all.PostgreSQL 9.2.18Running on replication mode Master-Slave (async).Server A (2 databases) is fully replicated to Server B.That works OK.Question:Is it possible to replicate only 1 out of 2 databases of Server A to Server B?
With 9.2, I think your only real solution is to use logical replication: bucardo, slony, londiste. These tools require a more involved setup and configuration than streaming replication (they're not built-in).
For 9.4+ you can use pg_logical. It's 'kind of' built in, you will still need a separate download and separate configuration flow.
All of the above allow you to select to the object (table, sequence) level. Just be careful, unlike streaming, there are a lot of caveats. For example, new tables are not auto-replicated, you cannot ALTER TABLE.
--Scott
Best regards,czezz