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Re: locks within select

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Subject: Re: locks within select
From: "David G. Johnston" <david.g.johnston@xxxxxxxxx>
Date: Mon, 13 Dec 2021 23:29:34 -0700
Cc: "pgsql-general@xxxxxxxxxxxxxxxxxxxx" <pgsql-general@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <CADX_1abA6Ykusa4m2WPv6wHfH1ZoCG=gZ+VJS2EFe0HaGB_1Rw@mail.gmail.com>
References: <CADX_1abA6Ykusa4m2WPv6wHfH1ZoCG=gZ+VJS2EFe0HaGB_1Rw@mail.gmail.com>

On Monday, December 13, 2021, Marc Millas <marc.millas@xxxxxxxxxx> wrote:

I was wondering if for example, within a join, some kind of lock may be acquired so that the dataset concerned is not changed during execution ? (for example a delete then autovacuum ??)

Read this primer on MVCC from the docs:

https://www.postgresql.org/docs/current/mvcc-intro.html

David J.

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