Re: Function to kill backend

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <mha(at)sollentuna(dot)net>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Function to kill backend
Date: 2004-04-06 18:12:08
Message-ID: 200404061812.i36IC8K15902@candle.pha.pa.us
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Josh Berkus wrote:
> Tom,
>
> > I don't think it's an open-and-shut decision as to whether people
> > actually *need* to do session kills (as opposed to query/transaction
> > kills). The arguments presented so far are not convincing to my mind,
> > certainly not convincing enough to buy into a commitment to do whatever
> > it takes to support that.
>
> Hmmm ... well, I can make a real-world case from my supported apps for
> transaction/statement kills. But my support for session kills is just
> hypothetical; any time I've had to kill off sessions, it's because I had to
> shut the database down, and that's better done from the command line.
>
> My web apps which need to manage the number of connections do it through their
> connection pool.
>
> So I would vote for Yes on SIGINT by XID, but No on SIGTERM by PID, if Tom
> thinks there will be any significant support & troubleshooting involved for
> the latter.
>
> Unless, of course, someone can give us a real business case that they have
> actually encountered in production.

Someone already posted some pseudocode where they wanted to kill idle
backends, perhaps as part of connection pooling.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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