Re: Create a logical and physical replication

Yes it is possible.

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________________________________
From: Ashok Kumar Tiwari <ashokt(at)ohumhealthcare(dot)com>
Sent: Tuesday, November 5, 2019 7:12:45 PM
To: Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>
Cc: Rui DeSousa <rui(at)crazybean(dot)net>; Shital A <brightuser2019(at)gmail(dot)com>; pgsql-general(at)lists(dot)postgresql(dot)org <pgsql-general(at)lists(dot)postgresql(dot)org>; pgsql-admin(at)lists(dot)postgresql(dot)org <pgsql-admin(at)lists(dot)postgresql(dot)org>
Subject: Re: Create a logical and physical replication

its possible to cascade a logical replication from a binary slave replica?

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On Tue, Nov 5, 2019 at 11:25 AM Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com<mailto:horikyota(dot)ntt(at)gmail(dot)com>> wrote:
Hello.

At Mon, 4 Nov 2019 19:05:24 +0530, Ashok Kumar Tiwari <ashokt(at)ohumhealthcare(dot)com<mailto:ashokt(at)ohumhealthcare(dot)com>> wrote in
> is it possible in postgres to create one physical replica for DR(data
> recovery purpose) and another one logical replica for reporting purpose

A physical replication standby cannot be a publisher. You will find
that CREATE PUBLICATION fails.

> master --------> physical standby (for DR Purpose)
> |
> |
> |
> |
> logical replica for reporting purpose
>
> ------------------ or cascading logic replication
>
> master --------> physical standby (for DR Purpose) ------------- >
> logical replica for reporting purpose

The former works (as documented in [1]) but the latter doesn't.

By the way, If I'm not missing anything I don't find a description on
this restriction in the documentation. Shouldn't it be in [2], or
[1]?

[1]: https://www.postgresql.org/docs/12/logical-replication.html
[2]: https://www.postgresql.org/docs/12/logical-replication-restrictions.html

regards.

--
Kyotaro Horiguchi
NTT Open Source Software Center

--
Ashok Kumar Tiwari,
Senior Technical Consultant,
ashokt(at)ohumhealthcare(dot)com<mailto:ashokt(at)ohumhealthcare(dot)com>,
M:+91-9657628833

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