Re: Does export operation cancel SQLs?

On Wed, 2025-02-19 at 12:10 +0100, shammat(at)gmx(dot)net wrote:
> Laurenz Albe schrieb am 19.02.2025 um 09:43:
> > > We have PostgreSQL 16 running in GCP cloud SQL. When export job runs we
> > > are noticing these messages excessively:
> > >
> > > db=postgres,user=postgres ERROR: canceling statement due to user request
> > >
> > > Does Export cancel the SQLs? If not, why are we noticing these messages
> > > excessively during the export operation? The load on the instance is minimal.
> >
> > I am not sure what exactly you mean by "export". A pg_dump?
> > But I am not aware of any operation that would cancel statements in other
> > sessions. Perhaps someone or something in your application sends cancel
> > requests when a statement is running too long, and the concurrent export
> > slows down the system.
>
> What if the "export" is done on a read-only replica?
>
> Could this be a "canceling statement due to conflict with recovery" in disguise?

That would be a different error message.

Yours,
Laurenz Albe

--

*E-Mail Disclaimer*
Der Inhalt dieser E-Mail ist ausschliesslich fuer den
bezeichneten Adressaten bestimmt. Wenn Sie nicht der vorgesehene Adressat
dieser E-Mail oder dessen Vertreter sein sollten, so beachten Sie bitte,
dass jede Form der Kenntnisnahme, Veroeffentlichung, Vervielfaeltigung oder
Weitergabe des Inhalts dieser E-Mail unzulaessig ist. Wir bitten Sie, sich
in diesem Fall mit dem Absender der E-Mail in Verbindung zu setzen.

*CONFIDENTIALITY NOTICE & DISCLAIMER
*This message and any attachment are
confidential and may be privileged or otherwise protected from disclosure
and solely for the use of the person(s) or entity to whom it is intended.
If you have received this message in error and are not the intended
recipient, please notify the sender immediately and delete this message and
any attachment from your system. If you are not the intended recipient, be
advised that any use of this message is prohibited and may be unlawful, and
you must not copy this message or attachment or disclose the contents to
any other person.