Horton

Re: Re: reloption to prevent VACUUM from truncating empty pages at the end of relation

Andrew Dunstan <andrew.dunstan@2ndquadrant.com>

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From: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Julien Rouhaud <rjuju123@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, "Tsunakawa, Takayuki" <tsunakawa.takay@jp.fujitsu.com>, Fujii Masao <masao.fujii@gmail.com>, David Steele <david@pgmasters.net>, Andres Freund <andres@anarazel.de>, "Bossart, Nathan" <bossartn@amazon.com>, Tom Lane <tgl@sss.pgh.pa.us>, Alvaro Herrera <alvherre@2ndquadrant.com>, Michael Paquier <michael@paquier.xyz>, Laurenz Albe <laurenz.albe@cybertec.at>, "Jamison, Kirk" <k.jamison@jp.fujitsu.com>, Amit Kapila <amit.kapila16@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2019-04-06T15:24:11Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add TRUNCATE parameter to VACUUM.

  2. Add vacuum_truncate reloption.

  3. Allow VACUUM to be run with index cleanup disabled.

On Fri, Apr 5, 2019 at 3:28 PM Robert Haas <robertmhaas@gmail.com> wrote:
>
> On Fri, Apr 5, 2019 at 2:11 PM Julien Rouhaud <rjuju123@gmail.com> wrote:
> > > My preference is for "truncate" over "shrink".
> >
> > I don't really like "shrink" either, but users already have problems
> > to get the difference between VACUUM and VACUUM FULL, I'm afraid that
> > "VACUUM TRUNCATE_TABLE" will just make things worse.
>
> That's not the proposed syntax, though.  What you'd end up writing is
> something like VACUUM (TRUNCATE OFF) myrel.
>

+1 for this syntax.

cheers

andrew

-- 
Andrew Dunstan                https://www.2ndQuadrant.com
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