public inbox for [email protected]  

help / color / mirror / Atom feed

From: Laurenz Albe <[email protected]>
To: Subramanian,Ramachandran <[email protected]>
To: [email protected] <[email protected]>
Subject: Re: AW: Replication Testing- How to introduce a Lag
Date: Wed, 25 Mar 2026 07:04:14 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>

On Tue, 2026-03-24 at 17:01 +0000, Subramanian,Ramachandran wrote:
> My question is , can the difference in LSN from this query approximated
> to the amount of data that is yet to be transferred
> 
> select  pg_wal_lsn_diff(pg_current_wal_lsn(),replay_lsn) from pg_stat_replication

That query measures the replication lag in bytes, that *is* the amount of data.

Problem solved!

Yours,
Laurenz Albe

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: AW: Replication Testing- How to introduce a Lag
  In-Reply-To: <[email protected]>

* 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