|From:||Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>|
|To:||Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>|
|Cc:||"David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Fabrízio Mello <fabriziomello(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>|
|Subject:||Re: Add important info about ANALYZE after create Functional Index|
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On Wed, Oct 28, 2020 at 03:05:39PM -0400, Tom Lane wrote:
>Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> writes:
>> On Mon, Oct 26, 2020 at 03:46:10PM -0700, David G. Johnston wrote:
>>> It would seem preferable to call the lack of auto-analyzing after these
>>> operations a bug and back-patch a fix that injects an analyze side-effect
>>> just before their completion. It doesn't have to be smart either,
>>> analyzing things even if the created (or newly validated) index doesn't
>>> have statistics of its own isn't a problem in my book.
>> I agree the lack of stats may be quite annoying and cause issues, but my
>> guess is the chances of backpatching such change are about 0.000001%. We
>> have a usable 'workaround' for this - manual analyze.
>This doesn't seem clearly different from any other situation where
>auto-analyze doesn't react fast enough to suit you. I would not
>call it a bug, at least not without a wholesale redefinition of
>how auto-analyze is supposed to work. As a close analogy, we
>don't make any effort to force an immediate auto-analyze after
>I don't see anything in the CREATE STATISTICS man page pointing
>that out, either. But there's probably room for "Notes" entries
>about it in both places.
I agree. I'll add it to my TODO list for the next CF.
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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