| From: | Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Christoph Berg <myon(at)debian(dot)org>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Surjective functional indexes |
| Date: | 2017-12-15 09:14:05 |
| Message-ID: | 623fdf0f-c3d1-7553-e784-f8d5a900239b@postgrespro.ru |
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| Lists: | pgsql-hackers |
On 15.12.2017 01:21, Michael Paquier wrote:
> On Fri, Dec 15, 2017 at 6:15 AM, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
>> Konstantin Knizhnik wrote:
>>> If you still thing that additional 16 bytes per relation in statistic is too
>>> high overhead, then I will also remove autotune.
>> I think it's pretty clear that these additional bytes are excessive.
> The bar to add new fields in PgStat_TableCounts in very high, and one
> attempt to tackle its scaling problems with many relations is here by
> Horiguchi-san:
> /message-id/20171211.201523.24172046.horiguchi.kyotaro@lab.ntt.co.jp
> His patch may be worth a look if you need more fields for your
> feature. So it seems to me that the patch as currently presented has
> close to zero chance to be committed as long as you keep your changes
> to pgstat.c.
Ok, looks like everybody think that autotune based on statistic is bad idea.
Attached please find patch without autotune.
--
Konstantin Knizhnik
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
| Attachment | Content-Type | Size |
|---|---|---|
| projection-6.patch | text/x-patch | 27.0 KB |
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