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* COPY performance vs insert
@ 2020-02-12 09:25 PG Doc comments form <noreply@postgresql.org>
2020-03-17 21:02 ` Re: COPY performance vs insert Bruce Momjian <bruce@momjian.us>
0 siblings, 1 reply; 2+ messages in thread
From: PG Doc comments form @ 2020-02-12 09:25 UTC (permalink / raw)
To: pgsql-docs@lists.postgresql.org; +Cc: colinthart@gmail.com
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/12/populate.html
Description:
I think this could be clearer. In particular, performance of COPY vs INSERT
from a query (INSERT INTO ... SELECT FROM ...) or INSERT with a list of rows
(INSERT INTO ... VALUES (), (), (), ...)
Is there any performance benefit with COPY in those cases?
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* Re: COPY performance vs insert
2020-02-12 09:25 COPY performance vs insert PG Doc comments form <noreply@postgresql.org>
@ 2020-03-17 21:02 ` Bruce Momjian <bruce@momjian.us>
0 siblings, 0 replies; 2+ messages in thread
From: Bruce Momjian @ 2020-03-17 21:02 UTC (permalink / raw)
To: colinthart@gmail.com; pgsql-docs@lists.postgresql.org
On Wed, Feb 12, 2020 at 09:25:05AM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/12/populate.html
> Description:
>
> I think this could be clearer. In particular, performance of COPY vs INSERT
> from a query (INSERT INTO ... SELECT FROM ...) or INSERT with a list of rows
> (INSERT INTO ... VALUES (), (), (), ...)
> Is there any performance benefit with COPY in those cases?
COPY input/outputs rows in bulk, so it is still faster to do COPY than
INSERT INTO ... SELECT FROM or INSERT INTO ... VALUES. You can run
tests to prove it.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EnterpriseDB https://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
+ Ancient Roman grave inscription +
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