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help / color / mirror / Atom feedFrom: Subramanian,Ramachandran <[email protected]>
To: Laurenz Albe <[email protected]>
To: [email protected] <[email protected]>
Subject: AW: AW: AW: Replication Testing- How to introduce a Lag
Date: Mon, 23 Mar 2026 05:55:34 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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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
[Subramanian,Ramachandran IT-md-db]
Thank you so much for your guidance, Today morning I noticed the columns being null .
| streaming | 0/491179E8 | 0/491179E8 | 0/491179E8 | 0/491179E8 | | | |
Does it make sense to use the below SQL as a primary health check ?
[postgres@Source_server~]$ psql -p 5432 -c " select pg_wal_lsn_diff(sent_lsn,replay_lsn) from pg_stat_replication"
pg_wal_lsn_diff
-----------------
0
(1 row)
LG
Ram
Freundliche Grüße
i. A. Ramachandran Subramanian
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