public inbox for [email protected]  

help / color / mirror / Atom feed

From: Siraj G <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: [email protected]
Subject: Re: Export operation efficiency in read replica
Date: Thu, 20 Mar 2025 18:28:32 +0530
Message-ID: <CAC5iy60NgOv2nRYNwSh2n-Pj82eUjghgWjV2VCuQUABsAZ9uiw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAC5iy60ZzcsxL1GKAdUdiqA7TFv_yQW3ZkN07VJM8J1Xkdk8Gg@mail.gmail.com>
	<[email protected]>

Hello Laurenz

As per my understanding coming to a proper conclusion wrt RPO with export
operation is challenging. Eg., the export started at x and ended at z, the
time stamp here for many data sets is different. Moreover, I do not think
there is an incremental way available for export, correct?

Please correct me if my understanding is wrong.

Although I do agree the primary choice of backup to be storage based, we
wanted to have export backups as well as a secondary.

Concerning the impact taking export on read only.. Would you think we may
run into recovery issues on the replica side or anything that would prevent
the operation from being successful?

Regards
Siraj

On Thu, Mar 20, 2025 at 5:29 PM Laurenz Albe <[email protected]>
wrote:

> 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
>

view thread (5+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: Export operation efficiency in read replica
  In-Reply-To: <CAC5iy60NgOv2nRYNwSh2n-Pj82eUjghgWjV2VCuQUABsAZ9uiw@mail.gmail.com>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox