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Re: fighting '<IDLE> in transaction'

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Vladimir Rusinov <vladimir(at)greenmice(dot)info>
Cc: Lewis Kapell <lkapell(at)setonhome(dot)org>, pgsql-admin(at)postgresql(dot)org
Subject: Re: fighting '<IDLE> in transaction'
Date: 2009-11-05 17:53:59
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Lists: pgsql-admin
On Thu, Nov 5, 2009 at 7:16 AM, Vladimir Rusinov
<vladimir(at)greenmice(dot)info> wrote:
> On Tue, Nov 3, 2009 at 5:54 PM, Lewis Kapell <lkapell(at)setonhome(dot)org> wrote:
>> Please see these earlier threads:
>> Is IDLE session really idle?
>> Idle connections
> Thanks - that was useful reading, but not related to my issue. There are not
> a lot of IDLE sessions: connection pools are configured accurate. There are
> problems with 'IDLE in transaction' sessions, which I believe may cause
> strong lock problems.

The real issue with idle in transaction isn't locking so much.  A
simple idle in transaction that just ran a select * from table limit
1; will have made it so that vacuum cannot reclaim space that it
normally could until that transaction is committed or rolled back.  So
it's much worse than simple locking of a few records, it's causing
your data store to bloat with all the otherwise reclaimable space
since that transaction began.  Let it run for a day or a week and a
busy database will be expanding until it's slow and possibly running
out of space.

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Subject: Re: fighting '<IDLE> in transaction'
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