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From: Pavel Stehule <[email protected]>
To: Marcelo Fernandes <[email protected]>
Cc: [email protected]
Subject: Re: Logging queries executed by SPI_execute
Date: Mon, 3 Feb 2025 06:45:31 +0100
Message-ID: <CAFj8pRAKZBhsFQVcmsfFfvEYgv0SeA7TWgjvLRtzCfdB6ws3JQ@mail.gmail.com> (raw)
In-Reply-To: <CAM2F1VNmR59qggpGMAeGu34_DCj_7h-3mTE1VP=VRnKE+F5ZJA@mail.gmail.com>
References: <CAM2F1VNmR59qggpGMAeGu34_DCj_7h-3mTE1VP=VRnKE+F5ZJA@mail.gmail.com>

Hi

po 3. 2. 2025 v 0:06 odesílatel Marcelo Fernandes <[email protected]>
napsal:

> Hi there,
>
> I have been trying to debug what queries an extension is firing. After
> reading
> the code for the extension, I noticed that all the statements are fired
> via the
> SPI interface, most specifically, using the SPI_execute* family of
> functions.
>
> However, the problem is that these statements don't seem to feature in the
> logfile. It has become a bit of a "dead end" for me to fully analyse what
> queries are fired in the end.
>
> My postgresql.conf is fairly simple, but I have added "log_statement =
> 'all'"
> and thus was expecting to see information for these statements too.
>
> Is there anything I am missing? Some configuration or perhaps another way
> to
> find out about these statements?
>
> It may not be relevant, but the extension I am having a look at is
> pg_repack if
> anyone is interested. I am trying to get a deeper understanding of what the
> function repack_apply does.
>

The queries executed by SPI are never executed on the top level. These
queries are marked as nested.

So you need to use auto_explain
https://www.postgresql.org/docs/current/auto-explain.html with active
auto_explain.log_nested_statements

Regards

Pavel


> Thanks,
> Marcelo.
>
>
>

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