RE: Question about VARCHAR Vs. CHAR fields

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04-20-2008, 08:41 AM

Doug Conrey

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RE: Question about VARCHAR Vs. CHAR fields

> -----Original Message-----
> From: owner-informix-list@iiug.org
> [mailto

wner-informix-list@iiug.org] On Behalf Of rkusenet
> Sent: Wednesday, July 06, 2005 2:11 PM
> To: informix-list@iiug.org
> Subject: Re: Question about VARCHAR Vs. CHAR fields
>
>
> "DA Morgan" <damorgan@psoug.org> wrote
>
> > Is it true that in Informix VARCHAR takes more space than CHAR?
>
> Not at all. Just one byte extra at the beginning to record the length.
>
> > In Oracle the waste of space and CPU comes with working
> with CHAR and
> > it has been almost completely abandoned.
>
> same is true with informix, except that upto a length of
> char(15) (some say even 20) the performance gain in char is
> worth the space wasted. so I would always recommend a char
> field upto char(15). The difference between char and varchar
> becomes stark in delete-and-load tables. That is tables which
> are periodically cleaned and loaded again. A table with
> fixed-length columns (char, int, date etc) loads much faster
> than with variable length table. I think it is something to
> do with the engine calculating before inserting on which page
> the row will fit.
>

Also, tables with varchar columns won't use light scans, which can
improve performance on large scans.

DC

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RE: Question about VARCHAR Vs. CHAR fields