From: Bruce Momjian <bruce@momjian.us>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: aditya desai <admad123@gmail.com>
Cc: Pgsql Performance <pgsql-performance@lists.postgresql.org>
Subject: Re: Any way to speed up INSERT INTO
Date: Fri, 4 Mar 2022 13:47:35 -0500
Message-ID: <YiJexxjLXukD8vhf@momjian.us> (raw)
In-Reply-To: <3967140.1646419359@sss.pgh.pa.us>
References: <CAN0SRDHkd=3j7_xu2G_mg0ku0uwdN+DDGxEn8gzO=9hb=UFtcw@mail.gmail.com>
<3967140.1646419359@sss.pgh.pa.us>
On Fri, Mar 4, 2022 at 01:42:39PM -0500, Tom Lane wrote:
> aditya desai <admad123@gmail.com> writes:
> > One of the service layer app is inserting Millions of records in a table
> > but one row at a time. Although COPY is the fastest way to import a file in
> > a table. Application has a requirement of processing a row and inserting it
> > into a table. Is there any way this INSERT can be tuned by increasing
> > parameters? It is taking almost 10 hours for just 2.2 million rows in a
> > table. Table does not have any indexes or triggers.
>
> Using a prepared statement for the INSERT would help a little bit.
Yeah, I thought about that but it seems it would only minimally help.
> What would help more, if you don't expect any insertion failures,
> is to group multiple inserts per transaction (ie put BEGIN ... COMMIT
> around each batch of 100 or 1000 or so insertions). There's not
> going to be any magic bullet that lets you get away without changing
> the app, though.
Yeah, he/she could insert via multiple rows too:
CREATE TABLE test (x int);
INSERT INTO test VALUES (1), (2), (3);
> It's quite possible that network round trip costs are a big chunk of your
> problem, in which case physically grouping multiple rows into each INSERT
> command (... or COPY ...) is the only way to fix it. But I'd start with
> trying to reduce the transaction commit overhead.
Agreed, turning off synchronous_commit for that those queries would be
my first approach.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
If only the physical world exists, free will is an illusion.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: bruce@momjian.us, tgl@sss.pgh.pa.us, admad123@gmail.com, pgsql-performance@lists.postgresql.org
Subject: Re: Any way to speed up INSERT INTO
In-Reply-To: <YiJexxjLXukD8vhf@momjian.us>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox