| From: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Question about behavior of snapshot too old feature |
| Date: | 2016-10-19 16:08:28 |
| Message-ID: | CACjxUsPt4MvWyaP3XfTWMM2DH3uthFbT6TV3z4eFsizmA9s5Pg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Oct 19, 2016 at 10:04 AM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Slide 10 of this presentation has an example showing
> old_snapshot_threshold set to '1min':
>
> http://momjian.us/main/writings/pgsql/features.pdf
If the presentation is intending to show reasonable values for
production use, that would be better as, maybe, '2h'.
As the documentation says at:
| Useful values for production work probably range from a small
| number of hours to a few days. The setting will be coerced to a
| granularity of minutes, and small numbers (such as 0 or 1min) are
| only allowed because they may sometimes be useful for testing.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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