From: Rafael Martinez <r.m.guerrero@usit.uio.no>
To: Craig Ringer <ringerc@ringerc.id.au>
Cc: pgsql-performance@postgresql.org
Subject: Re: Dramatic change in memory usage with version 9.1
Date: Wed, 21 Dec 2011 18:50:40 +0100
Message-ID: <4EF21C70.5000200@usit.uio.no> (raw)
In-Reply-To: <4EF11EE6.6020203@ringerc.id.au>
References: <4EEF5296.2030101@usit.uio.no>
<4EF11EE6.6020203@ringerc.id.au>
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On 12/21/2011 12:48 AM, Craig Ringer wrote:
> On 19/12/2011 11:04 PM, Rafael Martinez wrote:
>> Any ideas about why this dramatic change in memory usage when the only
>> thing apparently changed from our side is the postgres version?
>>
> It'd be interesting to know how much of your workload operates with
> SERIALIZABLE transactions, as the behavior of those has changed
> significantly in 9.1 and they _are_ more expensive in RAM terms now.
>
Hello
As long as I know, all the databases are using the default, "read
committed".
We have almost 500 databases across all our servers, but we are only
dbas. We provide the infrastructure necessary to run this and help users
when they need it but we have not 100% control over how they are using
the databases ;-)
regards,
- --
Rafael Martinez Guerrero
Center for Information Technology
University of Oslo, Norway
PGP Public Key: http://folk.uio.no/rafael/
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To: pgsql-performance@postgresql.org
Cc: r.m.guerrero@usit.uio.no, ringerc@ringerc.id.au
Subject: Re: Dramatic change in memory usage with version 9.1
In-Reply-To: <4EF21C70.5000200@usit.uio.no>
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