| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | "Yotsunaga, Naoki" <yotsunaga(dot)naoki(at)jp(dot)fujitsu(dot)com> |
| Cc: | 'Phil Florent' <philflorent(at)hotmail(dot)com>, 'Michael Paquier' <michael(at)paquier(dot)xyz>, 'Tomas Vondra' <tomas(dot)vondra(at)2ndquadrant(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [Proposal] Add accumulated statistics |
| Date: | 2018-11-21 21:27:25 |
| Message-ID: | 20181121212725.GA20251@momjian.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Tue, Nov 6, 2018 at 04:26:03AM +0000, Yotsunaga, Naoki wrote:
> On Sat, Nov 3, 2018 at 1:28 AM, Phil Florent wrote:
>
>
>
> >2) it consumes system resources
>
> While the system is running, you are always sampling system information, do not
> you? Like Oracle ASH.
>
> If so, does sampling have no significant impact on performance? Even if the
> interval is 0.01 s or more.
I am replying late, but one of the reasons that sampling is used is that
decreasing the sampling interval increases to overhead of the sampling
process, but doesn't affect the running backends.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
| From | Date | Subject | |
|---|---|---|---|
| Next Message | David Rowley | 2018-11-21 22:24:50 | Re: Speeding up INSERTs and UPDATEs to partitioned tables |
| Previous Message | Dmitry Dolgov | 2018-11-21 20:56:34 | Re: Index Skip Scan |