Em 04/12/2012 18:49, Sergey Konoplev escreveu:
On Tue, Dec 4, 2012 at 5:57 AM, Edson Richter <edsonrichter@xxxxxxxxxxx> wrote:
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"?
May be I am late with my reply but I would also recommend to take into
consideration the article from depesz where he explains and tests all
the textual types
http://www.depesz.com/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/.
Very useful one.
Yes, good education as well. I've read, and I'll consider the different
datatypes and more domain use in future.
But I don't see much changes in our schema, so using varchar(14) seems
to be as good as text.
My experience with other databases (MS SQL Server and Oracle) seems to
not apply 1:1 here (I've studied MSSQL internals and - at least up to
2005 version - is much more efficient with char than with varchar than
with text - for all operations).
Thanks again,
Edson
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Sergey Konoplev
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