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From: Subramanian,Ramachandran <[email protected]>
To: Laurenz Albe <[email protected]>
To: [email protected] <[email protected]>
Subject: AW: AW: AW: AW: Replication Testing- How to introduce a Lag
Date: Mon, 23 Mar 2026 16:36:22 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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No; you want to measure the lag between the primary's current WAL position and what was already replayed on the standby:

  SELECT pg_wal_lsn_diff(pg_current_wal_lsn(), replay_lsn)
  FROM pg_stat_replication;

[Subramanian,Ramachandran IT-md-db] 

Thank you yet again for your guidance...  

I noticed that  RBAs are not incremented one for one . i.e  1 row inserted does not mean RBA=RBA+1 . 1 row updated  does not mean RBA=RBA+1 

I have ALTER SYSTEM SET recovery_min_apply_delay=300000 ; ( on the stand by side ) 

On the Source side 
A simple create table results in a RBA difference of 108328 

A simple insert of 1 row results in a RBA difference of 296   sometimes 96 

Is there a way to estimate roughly the amount of data that remains to be transfered ?  


LG

Ram 


Freundliche Grüße

i. A. Ramachandran Subramanian
Zentralbereich Informationstechnologie

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