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From: Bruce Momjian <bruce@momjian.us>
To: David G. Johnston <david.g.johnston@gmail.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: Grega Jesih <Grega.Jesih@actual-it.si>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Pg Docs <pgsql-docs@lists.postgresql.org>
Subject: Re: text fields and performance for ETL
Date: Fri, 5 Nov 2021 11:27:33 -0400
Message-ID: <20211105152733.GC19812@momjian.us> (raw)
In-Reply-To: <CAKFQuwbVkQAySX+KPiQT8miAP4D0mgG-xzZDCCxtb8DFB0NTog@mail.gmail.com>
References: <686716cb5c4242c28e5967d9b6fcfc75@actual-it.si>
	<137264.1635961048@sss.pgh.pa.us>
	<c57e7a702932465ca9962d4f5d332c3a@actual-it.si>
	<CAKFQuwYFfESp=xUpktYBbW8TxO8k=+uWN8F2G5Ehis2cpYuDnw@mail.gmail.com>
	<70cf9fe110c246afb4eab054caab0c04@actual-it.si>
	<CAKFQuwbX37AwNcKHMeaOq+LS_nhw_6sHwaUK1+UsQ8Nuo7bcfg@mail.gmail.com>
	<516dc58b80fa418091f5262879019213@actual-it.si>
	<b288134ae2290d5abc2a2d516a8d58892a656f30.camel@cybertec.at>
	<20211105141712.GA19812@momjian.us>
	<CAKFQuwbVkQAySX+KPiQT8miAP4D0mgG-xzZDCCxtb8DFB0NTog@mail.gmail.com>

On Fri, Nov  5, 2021 at 07:32:12AM -0700, David G. Johnston wrote:
> On Friday, November 5, 2021, Bruce Momjian <bruce@momjian.us> wrote:
> 
> 
>     >
>     > Perhaps, right before the tip you quoted, something like that:
>     >
>     >   If your use case requires a length limit on character data, or
>     compliance
>     >   with the SQL standard is important, use "character varying".
>     >   Otherwise, you are usually better off with "text".
> 
>     I can support that if others think it is valuable.
> 
> 
> 
> The motivating complaint is that we should be encouraging people to use varchar
> (4000) instead of text so external tools can optimize.  If we are not going to
> do that I really don’t see the pointing in changing away from out current
> position of “only use text”.  True length limit requirements for data are rare,
> and better done in constraints along with all other the other constraint that
> may exist for the data.  I believe comments with respect to the SQL standard
> are already present and adequate.

Agreed.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

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






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