Re: Seeking reason behind performance gain in 12 with HashAggregate - Mailing list pgsql-performance

From Shira Bezalel
Subject Re: Seeking reason behind performance gain in 12 with HashAggregate
Date
Msg-id CAE0KEwHrXdXu8g8_1KJ5efnyS438CpOarxOERfKO4EvKpYcaBw@mail.gmail.com
Whole thread Raw
In response to Re: Seeking reason behind performance gain in 12 with HashAggregate  (Michael Lewis <mlewis@entrata.com>)
Responses Re: Seeking reason behind performance gain in 12 with HashAggregate
List pgsql-performance
Hi Michael,

I appreciate your question. I ran a vacuum analyze on the 9.6 table and it yielded no difference. Same number of buffers were read, same query plan.

Thanks,
Shira

On Mon, Jan 13, 2020 at 10:07 AM Michael Lewis <mlewis@entrata.com> wrote:
I am not at all familiar with PostGIS so perhaps this is a silly question, is bloat an issue on the older instance? Correlation isn't causation, but half the buffers scanned and half the runtime in the v12 plan has me curious why that might be.


--
Shira Bezalel 
Database Administrator & Desktop Support Manager
San Francisco Estuary Institute
Ph: 510-746-7304

 

pgsql-performance by date:

Previous
From: Michael Lewis
Date:
Subject: Re: Seeking reason behind performance gain in 12 with HashAggregate
Next
From: Tomas Vondra
Date:
Subject: Re: Seeking reason behind performance gain in 12 with HashAggregate