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help / color / mirror / Atom feedFrom: Subramanian,Ramachandran <ramachandran.subramanian@alte-leipziger.de>
To: Laurenz Albe <laurenz.albe@cybertec.at>
To: pgsql-novice@lists.postgresql.org <pgsql-novice@lists.postgresql.org>
Subject: AW: AW: AW: AW: Replication Testing- How to introduce a Lag
Date: Mon, 23 Mar 2026 16:36:22 +0000
Message-ID: <477369bf897b44feb2d2368f6fca93fc@alte-leipziger.de> (raw)
In-Reply-To: <0e00fcc0062b59b88f98dba4900ce49d5a9a3fea.camel@cybertec.at>
References: <aadb9058660d4e10b5cee44b82458802@alte-leipziger.de>
<f3927bc3a9baf4400325b91652869907f0581c97.camel@cybertec.at>
<e1e41761323040228570cf6a7e02518e@alte-leipziger.de>
<8b38fa5141905f9ad6983b8d5ae944e812e3d28a.camel@cybertec.at>
<fa47fe18078043adbdfe007b7270ffd0@alte-leipziger.de>
<fc42f77c80fdb3c0267148b807edfacc49b0b0ca.camel@cybertec.at>
<fc3be1f56ded49dc9be519f92d8b9ab4@alte-leipziger.de>
<0e00fcc0062b59b88f98dba4900ce49d5a9a3fea.camel@cybertec.at>
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
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To: pgsql-novice@postgresql.org
Cc: ramachandran.subramanian@alte-leipziger.de, laurenz.albe@cybertec.at, pgsql-novice@lists.postgresql.org
Subject: Re: AW: AW: AW: AW: Replication Testing- How to introduce a Lag
In-Reply-To: <477369bf897b44feb2d2368f6fca93fc@alte-leipziger.de>
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