Re: pg_stat directory and pg_stat_statements

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: Peter Geoghegan <pg(at)heroku(dot)com>
Cc: Ashesh Vashi <ashesh(dot)vashi(at)enterprisedb(dot)com>, Tomas Vondra <tv(at)fuzzy(dot)cz>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_stat directory and pg_stat_statements
Date: 2014-06-02 13:59:55
Message-ID: CAHGQGwEH1p2jj4kG33xm0qH0LwLyp7=Dn6A5WvQzv3HGuTbbLQ@mail.gmail.com
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On Thu, May 29, 2014 at 3:02 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> On Wed, May 28, 2014 at 10:49 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>> You're concerned about the scenario using pg_upgrade? I'm not sure the detail
>> of pg_upgrade. But if it doesn't work properly, we should have gotten
>> the trouble
>
> I'm not worried about pg_upgrade, because by design pg_stat_statements
> will discard stats files that originated in earlier versions. However,
> I don't see a need to change pg_stat_statements to serialize its
> statistics to disk in the pg_stat directory before we branch off 9.4.
> As you mentioned, it's harmless.

Yeah, that's an idea. OTOH, there is no *strong* reason to postpone
the fix to 9.5. So I just feel inclined to apply the fix now...

Regards,

--
Fujii Masao

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