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From: Shenavai, Manuel <[email protected]>
To: pgsql-general <[email protected]>
Subject: TOAST Table / Dead Tuples / Free Pages
Date: Thu, 13 Jun 2024 07:55:02 +0000
Message-ID: <AM9PR02MB7410F60E0B73567795B4D034E8C12@AM9PR02MB7410.eurprd02.prod.outlook.com> (raw)

Hi everyone,

I created a simple scenario to understand the handling of TOASTs<https://www.postgresql.org/docs/current/storage-toast.html;: There is an empty database with a single table and record. The single record gets updated multiple times with 10MB (bytea column). I can see that the table/toasttable size is growing (500MB).

Now I tried to find a way to get the DB size down again (it should be around 10MB instead of 500MB). I don’t want to use VACUUM FULL due to the exclusive lock.

Is there any way to remove the dead tuples and free the pages?

Thanks in advance &
Best regards,
Manuel

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