Edson Richter <edsonrichter(at)hotmail(dot)com> writes:
> In this specific case, the full length (14) is mandatory... so seems
> there is no loss or gain.
> Also, I see all varchar(...) created are by default "storage =
> EXTENDED" (from "Pg Admin"), while other datatypes (like numeric,
> smallint, integer) are "storage = MAIN".
> Can I have a gain using fixed length datatype in place of current
> varchar (like "numeric (14,0)")?
> Or changing to "char(14) check length(doc)=14" and "storage=MAIN"?
Sounds like premature optimization to me. I'd first express what I want
as clear as possible, e.g. "CREATE DOMAIN BrazilianCompanyId AS char(14)",
and try to spot and fix performance problems when I'm done with all that.