public inbox for [email protected]  

help / color / mirror / Atom feed

From: Ramakrishna m <[email protected]>
To: Greg Sabino Mullane <[email protected]>
To: Justin <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: Logical Replication Delay
Date: Sun, 29 Sep 2024 15:58:46 +0530
Message-ID: <CAG-eXHJNRhnjEbCYHdpcQULxaGqV0_JR4nSPxndRRUdshMNZ0A@mail.gmail.com> (raw)
In-Reply-To: <CAKAnmmLmvuo=TORx=hDw2y5fFOUc0sHb88O+6Z-Cs=oVtN9W4A@mail.gmail.com>
References: <CAG-eXHKr5pFzCKNqVhjQAUM0oxxCe8YUfjoLT8WmZx54Sk48kg@mail.gmail.com>
	<CAKAnmmLmvuo=TORx=hDw2y5fFOUc0sHb88O+6Z-Cs=oVtN9W4A@mail.gmail.com>

Hi Justin and Greg,

Thank you for your input and recommendations. We understand your point
regarding separating the tables into different publications and
subscriptions.
However, due to certain business constraints, we are unable to implement
this approach at the moment.

*We are planning to set up logical replication from a standby to another
server. When the primary goes down, there is no issue as the standby
becomes the primary and the logical slots are already present. However,
when the standby goes down, these slots are not copied to the third node or
the primary by Patroni. Is there an option available to handle this
scenario? *

Regards,
Ram.


On Wed, 25 Sept 2024 at 20:12, Greg Sabino Mullane <[email protected]>
wrote:

> On Sat, Sep 21, 2024 at 3:08 PM Ramakrishna m <[email protected]> wrote:
>
>> I would greatly appreciate any suggestions you may have to help avoid
>> logical replication delays, whether through tuning database or operating
>> system parameters, or any other recommendations
>>
> In addition to the things already answered:
>
> * What is the use case for logical replication? I assume your local
> replicas are able to keep up just fine.
>
> * Check the nature of the work for problems, e.g. ORM doing
> unnecessary/redundant updates, maintaining indexes that are not really
> needed
>
> * Looks like your wal_segment_size was boosted to 1GB. What drove that
> change?
>
> * Yes, autovacuum could affect things - make sure
> log_autovacuum_min_durations is set
>
> Cheers,
> Greg
>
>
>

view thread (2+ 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], [email protected], [email protected]
  Subject: Re: Logical Replication Delay
  In-Reply-To: <CAG-eXHJNRhnjEbCYHdpcQULxaGqV0_JR4nSPxndRRUdshMNZ0A@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