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st: Re: Saving data in compressed format? - wishlist...


From   "Don Spady" <dspady@ualberta.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Saving data in compressed format? - wishlist...
Date   Wed, 12 Feb 2003 12:54:50 -0700

There is a program called ZipMagic that does sort of what you want.  It
keeps files in zip format and when
you want them you click on them and they are unzipped on the fly.  When
you finish (I think) they recompress.  I used to use it but gave up as I
found I really didn't need it.  I think it is made by Ontrack software.

Donald Spady
Dep't of Pediatrics, University of Alberta
(780) 407-1244

Nature has no reset button.
----- Original Message -----
From: "Cruces,GA (pgr)" <G.A.Cruces@lse.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, February 12, 2003 12:37
Subject: st: Saving data in compressed format? - wishlist...


> Dear All,
>
> As you might have noticed, "zipping" a .dta file often results in
> compressed files that are less than one tenth of the original file
size.
> I couldn't find any documentation on a compressed stata file format -
if
> there is, please let me know and ignore the rest of this message. I
> solve the problem of large files (in Windows) by compressing the
folder,
> so it uses less disk space, but it is still a problem when you want to
> transfer or transport files.
> I don't really know what it would take, but my guess is that it
wouldn't
> be too hard to store the files in some sort of compressed format, and
> having Stata decompressing them on the fly when opening. I could even
> think of having very large datasets (larger than physical memory)
> compressed in memory... but that would probably slow things too much.
> Since I don't think this will be implemented soon, could someone share
> experiences on invoking Windows apps from within stata? I'm thinking
> about doing some sort of "usezip" program that would open .zip
files...
> Thank you!
> All the best,
>
> g.
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