From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
---|---|
To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
Cc: | "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
Subject: | Re: PostgreSQL 15 release announcement draft |
Date: | 2022-09-12 21:09:07 |
Message-ID: | 20220912210907.GA2503@telsasoft.com |
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Lists: | pgsql-hackers |
On Tue, Sep 13, 2022 at 08:17:27AM +1200, David Rowley wrote:
> > certain operating systems, PostgreSQL 15 supports the ability to
> > [prefetch WAL file contents](https://www.postgresql.org/docs/15/runtime-config-wal.html#GUC-RECOVERY-PREFETCH)
>
> I think "ability to prefetch WAL file contents" is not really an
> accurate way to describe this feature. What the prefetcher does is
> prefetch the pages of tables, indexes and materialized views which are
> referenced by WAL, so that when the recovery process comes along
> later, the pages of these relations which are being changed by the WAL
> record are more likely to be in memory so that the recovery process is
> less likely to have to load the referenced pages from disk.
>
> Perhaps the text should read:
>
> "PostgreSQL 15 adds support for prefetching pages referenced in [WAL]."
Related:
https://www.postgresql.org/message-id/20220904075450.6g4nm4hralyw3tab@alvherre.pgsql
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