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From: Laurenz Albe <[email protected]>
To: Siraj G <[email protected]>
To: [email protected]
Subject: Re: Export operation efficiency in read replica
Date: Thu, 20 Mar 2025 12:59:44 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAC5iy60ZzcsxL1GKAdUdiqA7TFv_yQW3ZkN07VJM8J1Xkdk8Gg@mail.gmail.com>
References: <CAC5iy60ZzcsxL1GKAdUdiqA7TFv_yQW3ZkN07VJM8J1Xkdk8Gg@mail.gmail.com>

On Thu, 2025-03-20 at 17:22 +0530, Siraj G wrote:
> I have a DB with 1TB in size serving needs of one of our critical
> applications. I have a requirement to take export of the DB on a
> daily basis, but want to carry out this operation in read replica.
> The postgresql version is: 16.6
> 
> What would be the RPO of such backup?

Depends on the speed of disk and network and on what an RPO is.

> What would be the impact on the READ REPLICA with a long running
> export operation?

Potentially severe.

You could look into storage technologies that allow you to take
a snapshot and clone it.

Yours,
Laurenz Albe

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