| From: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Noah Misch <noah(at)leadboat(dot)com>, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Subject: | Re: Re: PATCH: Split stats file per database WAS: autovacuum stress-testing our system |
| Date: | 2016-05-27 01:55:17 |
| Message-ID: | CAB7nPqTV4SD12qT3ru=Z7gt0vvWzGn22y_YyHOyRHHd1OGSD8g@mail.gmail.com |
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On Thu, May 26, 2016 at 6:43 PM, Tomas Vondra
<tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
> On 05/26/2016 10:10 PM, Tom Lane wrote:
>> Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> writes:
>> In view of 52e8fc3e2, there's more or less no case in which we'd be
>> writing stats without writing stats for the shared catalogs. So I'm
>> tempted to propose that we try to reduce the overhead by merging the
>> shared-catalog stats back into the global-stats file, thereby
>> halving the filesystem metadata traffic for updating those.
>
> [...]
>
> That being said, I'm not opposed to merging the shared catalog into the
> global-stats file - it's not really a separate database so having it in a
> separate file is a bit weird.
While looking at this stuff, to be honest I got surprised that shared
relation stats are in located in a file whose name depends on
InvalidOid, so +1 from here as well to merge that into the global
stats file.
--
Michael
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