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From: Kiran K V <[email protected]>
To: [email protected]
Subject: Query related to Logical Replication using test_decoding and unchanged-toast-datum
Date: Mon, 6 Jan 2025 19:49:47 +0530
Message-ID: <CAGv0ivrBc=X6iaWA9Fng7u8D5BbM6EbcNy-4xF0DGFrAV+c2zw@mail.gmail.com> (raw)

Hi,

I am currently using PostgreSQL version 16 and the test_decoding plugin to
perform logical replication (using replication slots). I have a simple
table with integer column and JSON column. When a non-JSON column is
updated, the value "unchanged-toast-datum" for the JSON column is obtained.
This shows that the value recorded in a TOAST table for a JSON column value
has not changed and is as expected. could you please tell me whether
PostgreSQL will truly log these values to WAL or not ? If not, what will be
entered into WAL for the JSON column if it remains unchanged?

Please let me know. Thank you very much.

Regards,
Kiran

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