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From: Tom Lane <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: Dennis White <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Can a long running procedure detect when smart shutdown is pending?
Date: Sat, 06 Jul 2024 09:38:22 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CAE=rie-ZcNzzt_8bKrN-7fnnbYL-ofbne4jNurd3HjjW2j9Yaw@mail.gmail.com>
	<[email protected]>

Laurenz Albe <[email protected]> writes:
> On Fri, 2024-07-05 at 14:12 -0400, Dennis White wrote:
>> My project's DB has a mutli-step stored procedure using Transaction Control that may take 30 minutes or more to complete.
>> I am curious if there is a way to make it more smart shutdown friendly so it can stop between steps?

> I don't think there is a direct way to do that in SQL; that would require a new
> system function that exposes canAcceptConnections() in SQL.

It's worse than that: the state variables involved are local to the
postmaster, so you wouldn't get the right answer in a backend even
if the function were reachable.

> What you could do is use the dblink extension to connect to the local database.
> If you get an error "the database system is shutting down", there is a smart
> shutdown in progress.

This'd probably work.  Ugly, but ...

			regards, tom lane

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