From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: PG 13 release notes, first draft |
Date: | 2020-07-30 01:30:50 |
Message-ID: | 20200730013050.GA30116@momjian.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Wed, Jul 29, 2020 at 03:34:22PM -0700, Peter Geoghegan wrote:
> Hi Bruce,
>
> On Fri, Jun 26, 2020 at 3:24 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > Patch attached and applied to PG 13.
>
> I committed the hash_mem_multiplier GUC to Postgres 13 just now.
>
> There should be a note about this in the Postgres 13 release notes,
> for the usual reasons. More importantly, the "Allow hash aggregation
> to use disk storage for large aggregation result sets" feature should
> reference the new GUC directly. Users should be advised that the GUC
> may be useful in cases where they upgrade and experience a performance
> regression linked to slower hash aggregation. Just including a
> documentation link for the GUC would be very helpful.
I came up with the attached patch.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EnterpriseDB https://enterprisedb.com
The usefulness of a cup is in its emptiness, Bruce Lee
Attachment | Content-Type | Size |
---|---|---|
hash.diff | text/x-diff | 787 bytes |
From | Date | Subject | |
---|---|---|---|
Next Message | Michael Paquier | 2020-07-30 01:46:11 | Re: [PATCH] Tab completion for VACUUM of partitioned tables |
Previous Message | Michael Paquier | 2020-07-30 01:28:40 | Re: Ought to use heap_multi_insert() for pg_attribute/depend insertions? |