Thread: Create a logical and physical replication

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Hello.

At Mon, 4 Nov 2019 19:05:24 +0530, Ashok Kumar Tiwari <ashokt@ohumhealthcare.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

Hello.

At Mon, 4 Nov 2019 19:05:24 +0530, Ashok Kumar Tiwari <ashokt@ohumhealthcare.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

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

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

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Yes it is possible.