Hello
2012/12/4 Edson Richter <edsonrichter@hotmail.com>:
> Em 04/12/2012 18:49, Sergey Konoplev escreveu:
>
>> On Tue, Dec 4, 2012 at 5:57 AM, Edson Richter <edsonrichter@hotmail.com>
>> 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).
sure - PostgreSQL has different design than "older" SQL servers that
was developed for fixed length records. So some knowledges related to
these databases are wrong here.
Regards
Pavel Stehule
>
> Thanks again,
>
> Edson
>
>
>
>>
>> --
>> Sergey Konoplev
>> Database and Software Architect
>> http://www.linkedin.com/in/grayhemp
>>
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>>
>>
>
>
>
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