From: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
---|---|
To: | David Steele <david(at)pgmasters(dot)net> |
Cc: | Peter Geoghegan <pg(at)bowt(dot)ie>, Robert Haas <robertmhaas(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, "Ideriha, Takeshi" <ideriha(dot)takeshi(at)jp(dot)fujitsu(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com> |
Subject: | Re: GUC for cleanup indexes threshold. |
Date: | 2017-03-03 16:16:22 |
Message-ID: | CAD21AoDSG+crs641UfxUjbXObXodGeLgLuRQY2D9-CEAxrwJLQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On Fri, Mar 3, 2017 at 10:45 PM, David Steele <david(at)pgmasters(dot)net> wrote:
> On 2/27/17 12:46 PM, Peter Geoghegan wrote:
>> On Sat, Feb 25, 2017 at 10:51 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>>
>>> Do you have an idea about that, or any ideas for experiments we could try?
>>
>> Nothing occurs to me right now, unfortunately. However, my general
>> sense is that it would probably be just fine when
>> vacuum_cleanup_index_scale_factor was 0.0, but there might be
>> non-linear increases in "the serious type of index bloat" as the
>> proposed new setting was scaled up. I'd be much more worried about
>> that.
>
> This was originally marked "Waiting on Author" due to some minor
> problems with the patch but on the whole there are much larger issues at
> play.
>
> The tenor seems to be that we should somehow prove the effectiveness of
> this patch one way or the other, but nobody is quite sure how to go
> about that, and in fact it would probably be different for each AM.
>
> Sawada, if you have ideas about how to go about this then we would need
> to see something very soon. If not, I think marking this RWF is the
> best course of action.
>
Thank you for the remind. I've post new idea about this. After got
consensus about the design, I'm going to update the patch.
Regards,
--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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