Re: 11.7. Indexes on Expressions

On Wed, Dec 22, 2021 at 05:09:53PM -0500, Bruce Momjian wrote:
> On Wed, Dec 22, 2021 at 03:06:12PM -0700, David G. Johnston wrote:
> > On Wed, Dec 22, 2021 at 2:45 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > 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?
>
> Wow, I don't think the acronym page is the right place for this --- I
> think we need a new section for this somewhere.

I think our _big_ missing information is a definition of HOT updates and
that updating a column involved in an index disables HOT updates.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.