Hi Laurenz,
Thank you for your answer

>> For some projects we need a fast manual switchover to address Near Zero 
>> downtime maintenance

I forgot to say that application would not be stopped during maintenance…

>There is no need for synchronous replication; you cannot lose data with a 
>switchover,
>if you do it right:

Ok

>> May logical replication ( bi-directional, with one instance RW and the other 
>> RO) be a better solution ?

> I'd say no.

Really ?

>> what could we expect (in term of downtime in both worlds) ?

> Usually seconds, so plan for ten minutes.

Brrr, I was thînking about a more reliable process.

Regards
PAscal

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