Re: Upgrading postgres quickly, without downtime.

pg_upgrade --link is the way to go for sure, but pay attention to the
details surrounding it for primary and replicas.

Regards,
Michael Vitale

Laurenz Albe wrote on 2/17/2023 7:13 AM:
> On Fri, 2023-02-17 at 15:01 +0530, Karthik Krishnakumar wrote:
>> I have a number of pg servers(~100 (each with a couple of replicas, so 300
>> clusters in total), each with ~2TB data) that is running version 10.
>> I am planning on upgrading to PG 15 and looking for ways to get it done
>> without downtime and quickly.
>> There seem to be a couple of ways to do this -
>> 1. dump/restore or upgrade -> but this causes downtime.
>> 2. logical replication/pglogical -> this is going to be slow, adds additional
>> load on the master, and it isnt recommended to do DDL during time.
>>
>> I do have daily backups of these databases.
>> Is there a way I can use these daily backups to upgrade to 15 and sync the changes for the day alone?
>> I can code in C/scripts, and know bit of internals and wanted to ask where to start on this.
>> I am also open to any alternate ideas.
> Take 10 minutes downtime and use "pg_upgrade --link".
>
> Yours,
> Laurenz Albe
>
>

Regards,

Michael Vitale

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