Highly compressed zipping

  • Thread starter Thread starter Maurice IRL
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M

Maurice IRL

I want to send a Microsoft Access database (.mde) file in highly zipped
format to the developer of a system based on Access. The email server has a
limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip, XP
Zip and several other zipping programs. The developer regularly zips and
sends even bigger files (over 30MB) with XP Zip, which compress to less than
4MB. The developer also receives similar large files from customers using XP
Zip. The question is: why won't XP Zip give me a better compression rate?
--
Maurice
 
The actual compression ratio achieved is HIGHLY dependent on the actual
contents of the file.

Maurice IRL wrote:

> I want to send a Microsoft Access database (.mde) file in highly zipped
> format to the developer of a system based on Access. The email server has a
> limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip, XP
> Zip and several other zipping programs. The developer regularly zips and
> sends even bigger files (over 30MB) with XP Zip, which compress to less than
> 4MB. The developer also receives similar large files from customers using XP
> Zip. The question is: why won't XP Zip give me a better compression rate?
 
"Maurice IRL" <Maurice IRL@discussions.microsoft.com> wrote in message
news:322A846F-5641-491A-8252-72E16AC40F88@microsoft.com...
>I want to send a Microsoft Access database (.mde) file in highly zipped
> format to the developer of a system based on Access. The email server has
> a
> limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip,
> XP
> Zip and several other zipping programs. The developer regularly zips and
> sends even bigger files (over 30MB) with XP Zip, which compress to less
> than
> 4MB. The developer also receives similar large files from customers using
> XP
> Zip. The question is: why won't XP Zip give me a better compression rate?
> --
> Maurice

Your file doesn't compress more because of the contents of your file aren't
compressible further.

And, email really isn't an appropriate transport mechanism for files like
this. Find some web or FTP space, send him the link and login information.

HTH
-pk
 
Thanks, Bob.
I appreciate that, of course, but the files I mentioned earlier are all of
the same type…
--
Maurice


"Bob I" wrote:

> The actual compression ratio achieved is HIGHLY dependent on the actual
> contents of the file.
>
> Maurice IRL wrote:
>
> > I want to send a Microsoft Access database (.mde) file in highly zipped
> > format to the developer of a system based on Access. The email server has a
> > limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip, XP
> > Zip and several other zipping programs. The developer regularly zips and
> > sends even bigger files (over 30MB) with XP Zip, which compress to less than
> > 4MB. The developer also receives similar large files from customers using XP
> > Zip. The question is: why won't XP Zip give me a better compression rate?
>
>
 
"Maurice IRL" <Maurice IRL@discussions.microsoft.com> wrote in message
news:322A846F-5641-491A-8252-72E16AC40F88@microsoft.com...
> I want to send a Microsoft Access database (.mde) file in highly zipped
> format to the developer of a system based on Access. The email server has
a
> limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip,
XP
> Zip and several other zipping programs. The developer regularly zips and
> sends even bigger files (over 30MB) with XP Zip, which compress to less
than
> 4MB. The developer also receives similar large files from customers using
XP
> Zip. The question is: why won't XP Zip give me a better compression rate?
> --
> Maurice

Some software will allow you to split an archive into several pieces. Winrar
is one.
 
Hi Maurice,

Have you compressed the database within Access first? What version of
Access are you referring to?

Regards,
Bert Kinney MS-MVP Shell/User
http://bertk.mvps.org
Member: http://dts-l.org

Maurice IRL wrote:
> I want to send a Microsoft Access database (.mde) file in highly zipped
> format to the developer of a system based on Access. The email server has a
> limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip, XP
> Zip and several other zipping programs. The developer regularly zips and
> sends even bigger files (over 30MB) with XP Zip, which compress to less than
> 4MB. The developer also receives similar large files from customers using XP
> Zip. The question is: why won't XP Zip give me a better compression rate?
 
Type is immaterial, THE CONTENTS WILL DETERMINE THE COMPRESSIBILITY!
(caps intended)

Maurice IRL wrote:

> Thanks, Bob.
> I appreciate that, of course, but the files I mentioned earlier are all of
> the same type…
 
On Tue, 24 Jul 2007 08:32:08 -0700, Maurice IRL <Maurice
IRL@discussions.microsoft.com> wrote:

> I want to send a Microsoft Access database (.mde) file in highly zipped
> format to the developer of a system based on Access. The email server has a
> limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip, XP
> Zip and several other zipping programs. The developer regularly zips and
> sends even bigger files (over 30MB) with XP Zip, which compress to less than
> 4MB. The developer also receives similar large files from customers using XP
> Zip. The question is: why won't XP Zip give me a better compression rate?



The compression rate you get (from *any* compression program) depends
very greatly on the actual data content of the file.

Here's a greatly simplified example:

Let's say I have a file that consists of 22 million bytes of random
text, and regular compression algorithms reduce it to 10MB. Now
compare that file to another file that contains 22 million bytes of
just the letter "a," repeated 22 million times.

In the second example I could reduce the file to just a few bytes,
containing something like a;repeat 220000000.

Actual compression algorithms are not that simple, and typically, in a
single file several types of algorithms are used. But this extreme
example should give you some idea of the range of compression that can
be achieved, depending on the file contents.

Some compression programs also achieve higher compression rates than
others, but the tradeoff with the faster ones is that compression and
decompression usually take longer.

You might want to use one of the several file splitter programs
available, so that you end up with two files you can E-mail
separately. Must third-party zip utilities have this capability, and
also permit the parts to be rejoined by the recipient.

Or you could use a service like http://www.yousendit.com/

Alternatively, ftp the file to a web site and send the recipient a
link to that web site.

--
Ken Blake, Microsoft MVP Windows - Shell/User
Please Reply to the Newsgroup
 
use winzip's "Split" capability to split the large single zip file into
several smaller pieces, and mail each one separately.
 
"Maurice IRL" <Maurice IRL@discussions.microsoft.com> wrote in message
news:322A846F-5641-491A-8252-72E16AC40F88@microsoft.com...
>I want to send a Microsoft Access database (.mde) file in highly zipped
> format to the developer of a system based on Access. The email server has a
> limit of 5MB, but the 22MB file is almost 6MB when compressed with WinZip, XP
> Zip and several other zipping programs. The developer regularly zips and
> sends even bigger files (over 30MB) with XP Zip, which compress to less than
> 4MB. The developer also receives similar large files from customers using XP
> Zip. The question is: why won't XP Zip give me a better compression rate?

Consider using 7-Zip:
http://www.7-zip.org/
 
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