Re: 11.7. Indexes on Expressions

On Wed, Dec 22, 2021 at 2:45 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:

> On Wed, Dec 22, 2021 at 02:40:12PM -0700, David G. Johnston wrote:
> > On Fri, Dec 17, 2021 at 2:43 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> >
> > I am attaching an updated patch which mentions non-HOT updates for
> > expression indexes.
> >
> >
> > Thanks. I'm a bit concerned that before this patch the only place we
> mentioned
> > HOTin the docs is in the appendix acronym listing which points to the
> readme
> > file in the source code.
>
> Uh, I had a similar concern and found these cases:
>
> monitoring.sgml: Number of rows updated (includes HOT
> updated rows)
> monitoring.sgml: Number of rows HOT updated (i.e., with no
> separate index
>
> Not sure what else we can do --- it would be odd to explain it in the
> expression index docs.
>
>
Found another one:

https://www.postgresql.org/docs/current/btree-implementation.html
"...(where most individual updates cannot apply the HOT optimization."

Make the acronym HOT in all these places take the reader to the acronym
page, and add a brief description there so they don't need to consume the
readme file?

David J.