Subject: Re: Should we increase the default vacuum_cost_limit?
To: Peter Geoghegan <pg@bowt.ie>, Robert Haas <robertmhaas@gmail.com>
Cc: David Rowley <david.rowley@2ndquadrant.com>,
 Joe Conway <mail@joeconway.com>,
 PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Message-ID: <c5a2de9d-ded2-5876-5420-d1f6190ff352@2ndquadrant.com>
Date: Tue, 5 Mar 2019 13:53:07 +0100
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On 3/5/19 1:14 AM, Peter Geoghegan wrote:
> On Mon, Feb 25, 2019 at 8:48 AM Robert Haas <robertmhaas@gmail.com> wrote:
>> +1 for raising the default substantially.  In my experience, and it
>> seems others are in a similar place, nobody ever gets into trouble
>> because the default is too high, but sometimes people get in trouble
>> because the default is too low.
> 
> Does anyone want to make an argument against the idea of raising the
> default? They should speak up now.
> 

I don't know.

On the one hand I don't feel very strongly about this change, and I have
no intention to block it (because in most cases I do actually increase
the value anyway). I wonder if those with small systems will be happy
about it, though.

But on the other hand it feels a bit weird that we increase this one
value and leave all the other (also very conservative) defaults alone.


regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services