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From: Laurenz Albe <[email protected]>
To: Subramanian,Ramachandran <[email protected]>
To: [email protected] <[email protected]>
Subject: Re: AW: AW: Replication Testing- How to introduce a Lag
Date: Sat, 21 Mar 2026 09:43:10 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Sat, 2026-03-21 at 07:49 +0000, Subramanian,Ramachandran wrote:
> > Look at "pg_stat_replication" on the primary server.
> 
> If I just look at the write_lag columns, it would give me a good idea of the situation --  Is my understanding correct ?

Yes, but if no WAL gets generated and replicated for a while, the columns will
become NULL, because then delay measured in time makes no sense.

Therefore, I prefer to use "replay_lsn" and friends and measure the lag in bytes.

Yours,
Laurenz Albe

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