Re: Long Running Commits - Not Checkpoints

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Long Running Commits - Not Checkpoints
Date: 2007-09-13 15:10:09
Message-ID: 15180.1189696209@sss.pgh.pa.us
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Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info> writes:
> On Thu, 2007-09-13 at 10:15 -0400, Brad Nicholson wrote:
>> I'm having a problem with long running commits appearing in my database
>> logs. It may be hardware related, as the problem appeared when we moved
>> the database to a new server connected to a different disk array.

> More on this - we also have long running commits on installations that
> do have the wal files on a separate partition.

What's your definition of "long running commit" --- seconds? milliseconds?
Exactly what are you measuring? Can you correlate the problem with what
the transaction was doing?

regards, tom lane

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