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I want to setup a replica between 2 different versions of postgres.

Is it possible to setup a replica between pg11(publicator) and pg12(subcriptor)?

Many thanks

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Yes , definitely. I tried this once and it worked with no errorors

Gabriele D'Onufrio
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    Worth to note, that this is only possible with **logical** replication, not with streaming replication –  Jul 09 '20 at 13:52