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Re: Feature thought: idle in transaction timeout

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
Cc: Russell Smith <mr-russ(at)pws(dot)com(dot)au>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Feature thought: idle in transaction timeout
Date: 2007-03-31 16:03:10
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
"Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
> Russell Smith wrote:
>> I agree with this, it reduces the long running transaction problem a 
>> little where the user forgot to commit/rollback their session.  I may be 
>> worth having a transaction_timeout as well, and setting it to link a few 
>> hours by default.  That way you can't have really long running 
>> transactions unless you specifically set that.

> We would certainly need to be able to disable on the fly too just with 
> SET as well.

AFAICS, a *transaction* timeout per se has no use whatever except as a
foot-gun.  How will you feel when you start a 12-hour restore, go home
for the evening, and come back in the morning to find it aborted because
you forgot to disable your 4-hour timeout?

Furthermore, if you have to set transaction_timeout to multiple hours
in the (vain) hope of not killing something important, what use is it
really?  If you want to keep VACUUM able to work in a busy database,
you need it to be a lot less than that.

An *idle* timeout seems less risky, as well as much easier to pick a
sane value for.

			regards, tom lane

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