postgrsql 9.5: Old WAL files remain in secondary `pg_xlog`

From: Mohan NBSPS <mohan(dot)nbs(dot)ont(at)gmail(dot)com>
To: pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: postgrsql 9.5: Old WAL files remain in secondary `pg_xlog`
Date: 2024-05-31 23:00:52
Message-ID: CAPCvfWcOxdKpRqn7rYJKQTt7GscG_OHsftm-Qc2Byfkp9ux9kQ@mail.gmail.com
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Hello Community,

Although the WAL retaining settings are default (max size 1GB),
`wal_keep_segments` is 25, checkpoint target is 2.5 minutes(default).
I noticed a few WAL files in secondary nodes (streaming replication)
`pg_xlog`
folder.

What could be the reason why postgresql did not delete these ?

Thank you
Regards
Mohan

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