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From: Laurenz Albe <[email protected]>
To: Dimitrios Apostolou <[email protected]>
To: [email protected]
Subject: Re: Experience and feedback on  pg_restore --data-only
Date: Sun, 23 Mar 2025 17:00:39 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Thu, 2025-03-20 at 23:48 +0100, Dimitrios Apostolou wrote:
> Performance issues: (important as my db size is >5TB)
> 
> * WAL writes: I didn't manage to avoid writing to the WAL, despite having
>    setting wal_level=minimal. I even wrote my own function to ALTER all
>    tables to UNLOGGED, but failed with "could not change table T to
>    unlogged because it references logged table".  I'm out of ideas on this
>    one.

You'd have to create an load the table in the same transaction, that is,
you'd have to run pg_restore with --single-transaction.

> Any feedback for improving my process? Should I put these ideas somewhere
> as ideas for improvement on pg_restore?

You put your ideas in the right place.

Yours,
Laurenz Albe

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