Message-ID: <48B584C0.6080204@Sheeky.Biz>
Date: Thu, 28 Aug 2008 02:15:52 +0930
From: Shane Ambler <pgsql@Sheeky.Biz>
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To: Bill Moran <wmoran@collaborativefusion.com>
CC: henk de wit <henk53602@hotmail.com>,
	"pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: select on 22 GB table causes "An I/O error occured
	while sending to the backend." exception
References: <BAY124-W57D3654AF1159CAF8EAC19F5660@phx.gbl>
	<dcc563d10808261123q57c8797bk77bc00eb949fc747@mail.gmail.com>
	<BAY124-W383ADB13D25B83F8B60E92F5660@phx.gbl>
	<20080827090123.c0e8e638.wmoran@collaborativefusion.com>
In-Reply-To: <20080827090123.c0e8e638.wmoran@collaborativefusion.com>
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Bill Moran wrote:

> On a side note, what version of PG are you using?  If it was in a 
> previous email, I missed it.
> 
He mentioned 8.3.1 in the first email.
Although nothing stands out in the 8.3.2 or 8.3.3 fix list (without 
knowing his table structure or any contrib modules used) I wonder if
one of them may resolve his issue.

I also wonder if the error is actually sent back from postgresql or
whether jdbc is throwing the exception because of a timeout waiting for
a response. I would think that with the table in use having 22GB data
and 13GB indexes that the long running query has a chance of creating a
delay on the connections that is long enough to give jdbc the impression
that it isn't responding - generating a misleading error code of "An I/O
error" (meaning we know the server got the request but the response from
the server isn't coming back)

Can you increase the timeout settings on the insert connections that are
failing?


-- 

Shane Ambler
pgSQL (at) Sheeky (dot) Biz

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