Postgres Pro
Downloads
Home   >   mailing lists

Re: Hybrid Hash/Nested Loop joins and caching results from subplans - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Hybrid Hash/Nested Loop joins and caching results from subplans
Date
Msg-id 20200902134954.GA6711@alvherre.pgsql
Whole thread Raw
In response to Re: Hybrid Hash/Nested Loop joins and caching results from subplans  (David Rowley <dgrowleyml@gmail.com>)
Responses Re: Hybrid Hash/Nested Loop joins and caching results from subplans  (David Rowley <dgrowleyml@gmail.com>)
List pgsql-hackers
Tree view 
On 2020-Sep-02, David Rowley wrote:

> v7 (Separate Result Cache node)
> Query 1:
>  Execution Time: 894.003 ms
> 
> Query 2:
>  Execution Time: 854.950 ms

> v7 + hacks_V3 (caching done in Nested Loop)
> Query 1:
>  Execution Time: 770.470 ms
>
> Query 2
>  Execution Time: 779.181 ms

Wow, this is a *significant* change.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

pgsql-hackers by date:

Previous
From: Amit Kapila
Date:
Subject: Re: PATCH: logical_work_mem and logical streaming of large in-progress transactions
Next
From: Anastasia Lubennikova
Date:
Subject: Re: [patch] Fix checksum verification in base backups for zero page headers